Biology Practice Questions

[cl24uw06]

I thought it would be helpful to start a link with biology practice questions. Here is the first one:

Which RNA typically contains the fewest nucleotides?
A. rRNA
B. tRNA
C. mRNA
D. All types of RNA contain the same number of nucleotides

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[dat_student]

Which chamber of the heart contains the most highly oxygenated blood?

A. Left ventricle
B. Right ventricle
C. Left atrium
D. Right atrium

c) left atrium

 

[Oprah]

Carbohydrate disestion occurs in many regions of the digestive tract. Carbohydrate digestion first occurs in the:

A. stomach
B. duodenum
C. mouth
D. small intestine

mouth

 

[heshyn2000]

Which protein is NOT involved in the digestion or metabolism of carbohydrates?

A. Amylase
B. Maltase
C. Insulin
D. None of the above; all are involved

Insulin

 

[heshyn2000]

The brain is responsible for

a. voluntary actions
b. Dreams
c. Thoughts
d. all of the above

d

 

[heshyn2000]

The digestive activity in the duodenum occurs:

A. at acid pH
B. once gastric pepsin has digested all proteins to amino acids
C. after bicarbonate release by the pancreas
D. after secretin release by the pancreas

I think D

 

[heshyn2000]

While being swallowed, food is prevented from entering the larynx and progressing into the lungs by apposition of the larynx and the:

A. epiglottis
B. pharynx
C. eustachian tube
D. esophagus

esophagus

 

[dat_student]

esophagus

wrong...epiglottis

 

[dat_student]

I think D

wrong again...C -> after release of bicarbonate from pancrease

 

[Comet208]

Movement of contents through the digestive tract of man is characterized by unidirectional oral-to-anal waves of contraction known as:

A. peristalsis
B. posterior progression waves
C. pericolonic waves
D. regurgitation

Three major segments of the small intestive, in order of passage, are:

A. duodenum, ileum, jejunum
B. duodenum, ascending colon, ileum
C. duodenum, jejunum, ileum
D. duodenum, ileum, ascending colon

I think i saw the SAME questions on the DAT!

 

[dat_student]

I think i saw the SAME questions on the DAT!

It's a good news. I hope they are as easy as these questions. ;-) I hate questions that ask about a strange organism that I haven't heard about. classes, orders, families and the like. I don't think I can possibly memorize all the classes, orders, families and the names of all organisms that belong to each category....Some of the questions that I have seen on practice tests seem to have deviated from the objectives of the DAT. I hope the real test is not like that.

 

[Comet208]

Some of the questions that I have seen on practice tests seem to have deviated from the objectives of the DAT.

Eh, the entire DAT is a big deviation of the purpose it was intended for!

 

[katieTX]

Crossing over occurs during which of the following phases in sexual reproduction?

Metaphase I
Metaphase II
Prophase I
Prophase II
Anaphase I

Prophase I???

 

[katieTX]

Mitochondria and chloroplasts both:

A. function to provide the cell a source of energy.
B. are present in plants.
C. contain DNA.
D. all of the above

D. all of the above

 

[katieTX]

Which of these researchers would be most interested in maintaining a healthy deciduous forest?

Biochemist
Sonographer
Toxicologist
Ecologist

i think ecologist

 

[jr8047]

ok..i'll play...

Which of the following statements about DNA polymerase is incorrect?

a. it joins complementary base pairs to each other.

b. it is able to proofread and correct for errors in base pairing.

c. it is unable to join free nucleotides unless an RNA primer is present.

d. it only works in the 5' to 3' direction.

e. it is found in eurkaryotes and prokaryotes.

 

[jr8047]

The DNA of an organism has thymine as 20% of its bases. what percentage of its bases would be guanine?

a. 20%
b.30%
c. 40%
d. 60%
e. 80%

 

[shengx12]

Cells are grown in N15 for many generations and transferred to N14 media. After how many generation does the cellular DNA contain 6.25% N15.

A. One
B. Two
C. Three
D. Four

The ans. is d 0.5^4= 0.0625

 

[jr8047]

The DNA of an organism has thymine as 20% of its bases. what percentage of its bases would be guanine?

a. 20%
b.30%
c. 40%
d. 60%
e. 80%

Answer: b

 

[jr8047]

ok..i'll play...

Which of the following statements about DNA polymerase is incorrect?

a. it joins complementary base pairs to each other.

b. it is able to proofread and correct for errors in base pairing.

c. it is unable to join free nucleotides unless an RNA primer is present.

d. it only works in the 5' to 3' direction.

e. it is found in eurkaryotes and prokaryotes.

answer: a

 

[Tnz]

Answer: C, B, C
Originally Posted by cl24uw06
Refer to a sequence of DNA found on one strand of a double-stranded DNA molecule. This DNA sequence is:

3'AAGGCTAGC5'

What is the complementary DNA strand sequence?
A. 5'AAGGCTAGC3'
B. 5'TTCCGATCG3'
C. 5'TTCCGATCG3'
D. 5'UUCCGAUCG3'

What is the primary mRNA transcript made from the complementary strand identified in the previous question?
A. 5' CGATCGGAA3'
B. 5' CGAUCGGAA3'
C. 5' UUCCGAUCG3'
D. 5' GCUAGCCUU3'

What is the tRNA anticodon sequence coded for by the original DNA sequence?

A. AAG GCT AGC
B. TTC CGA TCG
C. AAG GCU AGC
D. UUC CGA UCG
The key to understanding these related questions is knowing the base pairing rules. For DNA, G bonds to C, whereas A bonds to T. For RNA, G bonds to C, and A bonds to U. Also note that mRNA is complementary to DNA, and tRNA is complementary to mRNA. Therefore, for this set of questions:
Original DNA 3'AAGGCTAGC5'
Complementary DNA 5' TTCCGATCG3'
mRNA 3' AAGGCUAGC5'

Original DNA 3'AAGGCTAGC5'
mRNA 5' UUCCGAUCG3'
tRNA AAG GCU AGC

Do u mind explaining the second and third question again. I thought it was D for the second question since it asked for the primany mRNA transcript made so if this the is the original strain 3'AAGGCTAGC5' then shouldn't it be 5' UUCCGAUCG3'. I thought Uracil replaces the thymine for RNA. Also the last answer, do you mind explaing that one 'cause for some reason I got UCC CGA UCG.. I guess i would get that one wrong if i don't get the second one...

by the way, I think this is helpful.... Way to go

 

[Tnz]

The following organelle is found in prokaryotic cells but not eukaryotic cells of animal origin.

A. mitochondria
B. chloroplasts
C. nucleus
D. cell wall

I would say chloroplast... correct me if am wrong

 

[Tnz]

The shapes of animals are FUNDAMENTALLY

a. bilaterally symmetrical
b. as varied as those of plants
c. radially symmetrical
d. none of the above

a bilaterally symmetrical

 

[Tnz]

Amongst the Metazoa, and excluding the Porifera, there are thought to be which major evolutionary lines?

a. the cnidaria (with the ctenophores), and all other metazoa
b. hephalumps and heterolumps
c. arthropods and chordates
d. protostomes and deuterostomes

Is't arthropods and chordates.... not really sure about this

 

[Tnz]

The resting potential of a neuron is

a. the difference of electrical potential across the membrane of the neuron at rest
b. the high concentration of chloride ions flowing into the cell
c. the consequences of schwann cell enwrapment
d. none of the above

resting potential neurions ... I was thinking isn't it where they are more K inside then Na... 2k in 3 NA out. It's also more negative inside so i am thinking it's high chloride inside since it has negative charge...

 

[Tnz]

Mitochondria and chloroplasts both:

A. function to provide the cell a source of energy.
B. are present in plants.
C. contain DNA.
D. all of the above

Is't A?

 

[Tnz]

Spiral and radial cleavage are

a. typical of the early pre-cambrian fossils
b. typical of several types of chordates
c. an adaptation for aquatic life
d. none of the above

b

 

[katieTX]

Is't A?

Mitochondria and chloroplasts both:

A. function to provide the cell a source of energy.
B. are present in plants.
C. contain DNA.
D. all of the above

i think the correct answer is
d. all of the above

 

[dat_student]

I would say chloroplast... correct me if am wrong

I'd say the question has no correct answer.
mitochondria, chloroplasts, nucleus are organelles and are only found in eukaryotes.

Some eukaryotes (e.g. plants) & some prokaryotes (bacteria) have cell walls.

 

[DICK]

Mitochondria and chloroplasts both:

A. function to provide the cell a source of energy.
B. are present in plants.
C. contain DNA.
D. all of the above

i think the correct answer is
d. all of the above

good job! you are correct!

do you know the endo-symbiont hypothesis - it will give you insight as to how/why mitochondria and chloroplasts both contain their own genomes (dna). REMEMBER - plants have BOTH chloroplasts and mitochondria. Chloroplasts for photosynthesis (obviously), and mitochnorida for utilizing energy from products of photosyntheis (yes, plants need energy too!).

So, yes, you are correct in the forumalation of answer choice d as the correct answer, you are correctomundo! good job katie! keep it up!

 

[dat_student]

b

a. typical of the early pre-cambrian fossils
b. typical of several types of chordates
c. an adaptation for aquatic life
d. none of the above

my guess would be none of the above

 

[dat_student]

Is't A?

A. function to provide the cell a source of energy.
B. are present in plants.
C. contain DNA.
D. all of the above

I don't agree.I think the answer is all of the above.

 

[dat_student]

Is't arthropods and chordates.... not really sure about this

a. the cnidaria (with the ctenophores), and all other metazoa
b. hephalumps and heterolumps
c. arthropods and chordates
d. protostomes and deuterostomes

wrong answer. I think the correct answer is "protosomes and deutrosomes"

 

[dat_student]

resting potential neurions ... I was thinking isn't it where they are more K inside then Na... 2k in 3 NA out. It's also more negative inside so i am thinking it's high chloride inside since it has negative charge...

mainly due to the proteins inside NOT the cloride

 

[DICK]

a. typical of the early pre-cambrian fossils
b. typical of several types of chordates
c. an adaptation for aquatic life
d. none of the above

my guess would be none of the above

why none of the above? i think tnz was correctomundo!

check this out,

spiral and radial cleavage describes the deuterostomes and the protostomes, one cleaves sprialy ,and the other radially. i can't remember which is which. However, both deuterostomes and protostomes evolved last among animal kingdom, therefore, choice a is eliminated. choice c is eliminated because humans and many land animals undergoe radial cleavage. answer b is correct, since it's simply true.

 

[katieTX]

good job! you are correct!

do you know the endo-symbiont hypothesis - it will give you insight as to how/why mitochondria and chloroplasts both contain their own genomes (dna). REMEMBER - plants have BOTH chloroplasts and mitochondria. Chloroplasts for photosynthesis (obviously), and mitochnorida for utilizing energy from products of photosyntheis (yes, plants need energy too!).

So, yes, you are correct in the forumalation of answer choice d as the correct answer, you are correctomundo! good job katie! keep it up!

yep, i learned that 1st time in evolution class. pretty helpful for DAT. thanks 4 remind me. i enjoy this thread so much. have to b 5 stars, rite?

 

[dat_student]

why none of the above? i think tnz was correctomundo!

check this out,

spiral and radial cleavage describes the deuterostomes and the protostomes, one cleaves sprialy ,and the other radially. i can't remember which is which. However, both deuterostomes and protostomes evolved last among animal kingdom, therefore, choice a is eliminated. choice c is eliminated because humans and many land animals undergoe radial cleavage. answer b is correct, since it's simply true.

b cannot possibly be correct
Here is the question again:
Spiral and radial cleavage are

a. typical of the early pre-cambrian fossils
b. typical of several types of chordates
c. an adaptation for aquatic life
d. none of the above

chordates don't have spiral cleavage.

 

[DICK]

b cannot possibly be correct
Here is the question again:
Spiral and radial cleavage are

a. typical of the early pre-cambrian fossils
b. typical of several types of chordates
c. an adaptation for aquatic life
d. none of the above

chordates don't have spiral cleavage.

i mixed radial for spiral!!!!!!!!!!!!!

whoops ! I got tricked! well done dat_student for catching my stupidity! You are quite corectomundo! I have eliminated choice a and c in my previous post, and now I must eliminate choice b!

answer is simply d, none of the above

NEXT...

 

[Hadiya]

1.The study of tissues is known as
A) etymology.
B) cytology.
C) pathology.
D) histology.
2.Which of the following is not one of the four types of tissues?
A) nervous
B) muscular
C) mesodermal
D) epithelial
3.The fibers of connective tissue are embedded in the matrix, which is also known as
A) lacunae.
B) mesenchyme.
C) parenchyma.
D) ground substance.
4.Which of the following is not a characteristic of connective tissue?
A) matrix
B) ground substance
C) collagen fibers
D) basement membrane
5.Epithelium may be modified to form
A) glands.
B) connective tissue.
C) lacunae.
D) ground substance.
6.Dense connective tissue is found in
A) tendons.
B) blood.
C) bone.
D) cartilage.
7.Blood, lymph, and tissue fluid are classified as _________ tissue.
A) adipose
B) simple
C) stratified
D) vascular
8._______ are cavities within bone or cartilage where cells reside.
A) Canaliculi
B) Osteons
C) Lacunae
D) Glia
9.In a neuron, the _________ typically receive neural impulses from adjacent neurons.
A) axon hillocks
B) dendrites
C) axons
D) nodes of Ranvier
10.The junction between neurons is known as the
A) hillock.
B) node.
C) synapse.
D) glia.


11.Fluid within the cell is known as the
A) intracellular fluid.
B) extracellular fluid.
C) interstitial fluid.
D) plasma.
12.A fibrous protein that is particularly abundant in many types of connective tissues is
A) keratin.
B) collagen
C) sclerenchyma.
D) parenchyma.
13.Which of the following is a pseudocoelomate animal?
A) a sponge
B) a nematode
C) a fish
D) a jellyfish


14.Vertebrates have only two types of striated muscle; skeletal and smooth.
A) True
B) False



15.The cellular components of bone are referred to as chondrocytes.
A) True
B) False

 

[heshyn2000]

I would say chloroplast... correct me if am wrong

Wrong, the answer is D.

 

[DICK]

1.The study of tissues is known as
A) etymology.
B) cytology.
C) pathology.
D) histology.
2.Which of the following is not one of the four types of tissues?
A) nervous
B) muscular
C) mesodermal
D) epithelial
3.The fibers of connective tissue are embedded in the matrix, which is also known as
A) lacunae.
B) mesenchyme.
C) parenchyma.
D) ground substance.
4.Which of the following is not a characteristic of connective tissue?
A) matrix
B) ground substance
C) collagen fibers
D) basement membrane
5.Epithelium may be modified to form
A) glands.
B) connective tissue.
C) lacunae.
D) ground substance.
6.Dense connective tissue is found in
A) tendons.
B) blood.
C) bone.
D) cartilage.
7.Blood, lymph, and tissue fluid are classified as _________ tissue.
A) adipose
B) simple
C) stratified
D) vascular
8._______ are cavities within bone or cartilage where cells reside.
A) Canaliculi
B) Osteons
C) Lacunae
D) Glia
9.In a neuron, the _________ typically receive neural impulses from adjacent neurons.
A) axon hillocks
B) dendrites
C) axons
D) nodes of Ranvier
10.The junction between neurons is known as the
A) hillock.
B) node.
C) synapse.
D) glia.


11.Fluid within the cell is known as the
A) intracellular fluid.
B) extracellular fluid.
C) interstitial fluid.
D) plasma.
12.A fibrous protein that is particularly abundant in many types of connective tissues is
A) keratin.
B) collagen
C) sclerenchyma.
D) parenchyma.
13.Which of the following is a pseudocoelomate animal?
A) a sponge
B) a nematode
C) a fish
D) a jellyfish


14.Vertebrates have only two types of striated muscle; skeletal and smooth.
A) True
B) False



15.The cellular components of bone are referred to as chondrocytes.
A) True
B) False

1. D
2. C?
3. B (a wild guess)
4. C (wot is ground subs?)
5. D - are you serious?
6. C - i think
7. D, i guess, but i thought bload would be considered connective (b/c of definition)
8. B (a guess, def not D)
9. B yay! i know this one!
10. C - woo, another!
11. A
12. B
13. B - i just finished studying this topic 15 min ago (am i right? is it B?)
14. i don't think smooth muscle is striaghted, FALSE
15. TRUE - it sounds so familiar


HOW DID I DO OUT OF 15?

the questions at the beginning were kind of hard (for me at least), what is 'ground substance', thanks for the questions!

 

[dat_student]

HOW DID I DO OUT OF 15?
!

1st glance:
your aswers to 3, 6, 8, & 15 are wrong...

 

[Hadiya]

Before I post the answers, good job Dick. You got 9 (including Q7 which I think there is a mistake) out of 15 right...

1) D.
Histology : The study of the tissues.

2) C.
The four types of animal tissues are: Epithelial - a covering tissue.
Connective - connecting and supporting
tissue.
Nerve- a conducting tissue
Muscle - a contracting tissue.
* Mesodermal is the wrong choice because it is derived from Mesoderm, one of the germ layers.
3) D.
Fibers of the connective tissue are embedded in an extracellular matrix which is also called ground substance. The ground substance is a liquid or jellylike where the framework of the connective cells lie.
4) D.
The free surface of the epithelium is exposed to air or fluid whereas the cellls at the base of the barrier are attached to a basement membrane, a dense mat of extracellular matrix (Campbell and Reece, pg 835). Therefore, connective tissue is not characterised by basement membrane.

5) A.
In addition to protecting the cells they line, some ephithelial cells called glandular ephitelia absorb or secrete solutions. They line the thyroid gland and secrete a hormone that regulates the body's rate of fuel consumption. There glandular epithelia that lines the lumen of the stomach also secretes a solution called mucus that lubricates the surface and keeps it moist (Campbell and Reece pg 835).

6) A.
Fibrous connective tissues are dense due to its large numbers of collagenous fibers and are found in the tendons (attach muscles to bones) and ligaments (bone to bone).

7)I suppose connective tissue should have been one of the answers (thank you Dick for correcting me).

8) C.
Bone consists of extracellular matrix with relatively few bone cells residing in lacunae in the solid matrix.

9)B.
dendrites transmit impulses from their tips towards the cell body.

10) C.
Synapse is the locus where one neuron communicates with another neuron in a neural pathway.

11) A
Intracellular fluid.

12) B.
Connective tissue fibers are of three kinds: Collagenous fibers (made up of collagen), elastic fibers (made up of elastin) and reticular fibers (they are also made up of collagen).
13) B.
Nematode
14) B.
False because smooth muslces are not striated.

15) B.
I think the answer is: osteoblasts (double check).

 

[Awuah29]

Before I post the answers, good job Dick. You got 9 (including Q7 which I think there is a mistake) out of 15 right...

1) D.
Histology : The study of the tissues.

2) C.
The four types of animal tissues are: Epithelial - a covering tissue.
Connective - connecting and supporting
tissue.
Nerve- a conducting tissue
Muscle - a contracting tissue.
* Mesodermal is the wrong choice because it is derived from Mesoderm, one of the germ layers.
3) D.
Fibers of the connective tissue are embedded in an extracellular matrix which is also called ground substance. The ground substance is a liquid or jellylike where the framework of the connective cells lie.
4) D.
The free surface of the epithelium is exposed to air or fluid whereas the cellls at the base of the barrier are attached to a basement membrane, a dense mat of extracellular matrix (Campbell and Reece, pg 835). Therefore, connective tissue is not characterised by basement membrane.

5) A.
In addition to protecting the cells they line, some ephithelial cells called glandular ephitelia absorb or secrete solutions. They line the thyroid gland and secrete a hormone that regulates the body's rate of fuel consumption. There glandular epithelia that lines the lumen of the stomach also secretes a solution called mucus that lubricates the surface and keeps it moist (Campbell and Reece pg 835).

6) A.
Fibrous connective tissues are dense due to its large numbers of collagenous fibers and are found in the tendons (attach muscles to bones) and ligaments (bone to bone).

7)I suppose connective tissue should have been one of the answers (thank you Dick for correcting me).

8) C.
Bone consists of extracellular matrix with relatively few bone cells residing in lacunae in the solid matrix.

9)B.
dendrites transmit impulses from their tips towards the cell body.

10) C.
Synapse is the locus where one neuron communicates with another neuron in a neural pathway.

11) A
Intracellular fluid.

12) B.
Connective tissue fibers are of three kinds: Collagenous fibers (made up of collagen), elastic fibers (made up of elastin) and reticular fibers (they are also made up of collagen).
13) B.
Nematode
14) B.
False because smooth muslces are not striated.

15) B.
I think the answer is: osteoblasts (double check).

Hi guys,

it will be great when we start a tread also for math word problems

 

[dat_student]

Hadya's questions & answers

15) B.
I think the answer is: osteoblasts (double check).

I think 15 is "osteocyte" It's a more general term.

5.Epithelium may be modified to form
A) glands.
B) connective tissue.
C) lacunae.
D) ground substance.

oops! I confused epithelium with epidermis

 

[Hadiya]

I have looked into an anatomy and physiology textbook and this is what they have:
There are 4 types of cells in Bone tissue and they are:
1) osteoprogenitor: These cells are derived from mesenchyma and can undergo mitosis.
2) Osteoblasts (blast=germ or bud): They secrete collagen needed to build the bone and they have lost the ability to divide by mitosis. In the diagram that they have, osteoblast are found on the surface of the bone.
3) Osteocytes (cyte = cell): They are mature bone cells that derive from the osteoblasts. They have no mitotic potential. They are contained in the lacunae and they no longer secrete matrix but instead instead maintain cellular activities of bone tissue.
4) Osteoclasts(clast = to break): These types of cells settle on the surfaces of the bone and function in bone resorption (destruction of matrix).

According to the way the question was asked, any of these could be the answer. The Anatomy and physiology book that I have got this info from is called "Principles of Anatomy and Physiology" by Gerard tortora andGrabowski
Awuah29, I think the Math would be a great idea and I am sure many would benefit from it.

 

[dat_student]

I have looked into an anatomy and physiology textbook and this is what they have.....
.

Thanks Hadiya. A great set of questions and answers. I learned so much.

 

[cl24uw06]

I thought bringing this thread back from the dead might be helpful to some of you preparing to take the DAT, good luck.

 

[transzincIIB]

Which of the following has a 1-way digestive tract?
A. amoeba
B. earthworm
C. hydra
D. jellyfish
E. paramecium

 

[transzincIIB]

Which of the following has a 1-way digestive tract?
A. amoeba
B. earthworm
C. hydra
D. jellyfish
E. paramecium

B-is the answer. Annelids are segmented worms that have 1-way digestive tract. mouth-anus
Answers A and E Amoeba and paramecium lack digestive system
Answers C and D cnidarians like hydra and jellyfis have only single opening-ingest and expel food.

 

[shane.]

I thought bringing this thread back from the dead might be helpful to some of you preparing to take the DAT, good luck.

I've followed this tread through, and if you wouldn't mind posting the answers to your latest questions I'd appreciate it.

Thanks.