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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[Oprah]

The shapes of animals are FUNDAMENTALLY

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

 

[Oprah]

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

 

[Oprah]

Protostomes differ from deuterostomes in that the protostomes

a. have a diffuse nervous system
b. Are triploblastic
c. have eggs that undergo spiral cleavage
d. evolved later than deuterostomes

 

[Oprah]

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

 

[Oprah]

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

 

[Oprah]

The brain is responsible for

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

 

[Oprah]

The brain of a primate has

a. evolutionarily affinities to brains of reptiles
b. a cortex that is unique to humans
c. a telencephalon but lacks a rhombencephalon
d. no affinities with the brains of cetaceans

 

[Oprah]

Ion channels are not gated by

a. ions
b. current
c. chemicals
d. hinges

 

[Oprah]

Hair cells are typical of

a. lateral lines
b. the cochlear
c. statocysts
d. all of the above

 

[Oprah]

In chordates, nervous systems arise from which embryonic layer of the gastrula?

a. the endoderm
b. the mesoderm
c. the lining of the coelom
d. the ectoderm

 

[Oprah]

The particles attached to the cytoplasmic side of the thylakoid membrane:

a) contain ATP hydrolyzing enzymes

b) contain porins

c) are responsible for trapping light energy

d) are responsible for trapping light energy and passing it on to the reaction

center chlorophylls embedded in the thylakoid membrane

e) none of the above answers is correct

 

[Oprah]

The sino-atrial node is a pacemaker consisting of specialized cardiac muscle. Which of the following increases the frequency of depolarization of the pacemaker?

a. norepinephrine
b. acetylcholine
c. carbon dioxide
d. elevated sucrose

 

[cl24uw06]

The sino-atrial node is a pacemaker consisting of specialized cardiac muscle. Which of the following increases the frequency of depolarization of the pacemaker?

a. norepinephrine
b. acetylcholine
c. carbon dioxide
d. elevated sucrose

Are you going to post answers to these? By the way keep it up this is great

 

[Oprah]

Which statement best describes the function of the rough endoplasmic reticulum?

A. Specific transport and signaling systems
B. Synthesis and assembly of membrane and secreted proteins
C. Production of energy during photosynthesis
D. Processing of membrane and secreted proteins, including glycosylation

A - plasma membrane

B - CORRECT!!!

C - photosynethesis to do with chlorplasts (diff topic altogether )

D - that would be the good old golgi!

 

[Oprah]

Are you going to post answers to these? By the way keep it up this is great

YES, but I thought it would be nice if people could reply to them using their own logic, so people can read what answers others chose, and why

doesn't matter if one of my questions have been allready taken, your response WILL be read, because it will help YOU better understand the material, and also OTHERS!

i'm a little tired posting all these questions, i will take a break, and begin answering some right now, hopefully you guys can do the same too!

 

[Oprah]

The sino-atrial node is a pacemaker consisting of specialized cardiac muscle. Which of the following increases the frequency of depolarization of the pacemaker?

a. norepinephrine
b. acetylcholine
c. carbon dioxide
d. elevated sucrose

A) NE would be C O R E C T O M U N D O !!!

B) Ach (is that the right abreviation) - this is usually a RELAXANT

C) nothing to do with question - you should know the question wants you to distinguish between A or B

D) see C)

 

[Oprah]

The particles attached to the cytoplasmic side of the thylakoid membrane:

a) contain ATP hydrolyzing enzymes

b) contain porins

c) are responsible for trapping light energy

d) are responsible for trapping light energy and passing it on to the reaction

center chlorophylls embedded in the thylakoid membrane

e) none of the above answers is correct

D) I hope no explanatio is nessecary - PHOTOSYNTHESIS - get this stuff DOWN!!!

 

[Oprah]

The brain of a primate has

a. evolutionarily affinities to brains of reptiles
b. a cortex that is unique to humans
c. a telencephalon but lacks a rhombencephalon
d. no affinities with the brains of cetaceans

I found this to be one of those more 'difficult' questions, but biology is all about using what you allready know in the subject (which is probably a lot), and applying it...

...the correct answer is A...

You probably knew this answer, without realizing it (if your like me)...

fishes gave rise to the amphibians (remember - the development of tetrapods from those lungfishes that had fins that resmebled legs)

and it was the amphibians that gave rise to the reptiles, which also evolved into the primates...

...using this information, the answer had to be A)

...I hope that makes sense!

 

[Comet208]

There are all great test questions. But seriousely, how representative of real DAT are these questions??

 

[Oprah]

There are all great test questions. But seriousely, how representative of real DAT are these questions??

I believe that biology is all about exercising the mind, and I feel these questions do just that.

Biology is not like chemistry, since it involves a historical/more of a conceptual approach.

These questions, I believe builds/trains the brain to think in a more conceptualized manner

make sense?

 

[cowsgomoo]

I believe that biology is all about exercising the mind, and I feel these questions do just that.

Biology is not like chemistry, since it involves a historical/more of a conceptual approach.

These questions, I believe builds/trains the brain to think in a more conceptualized manner

make sense?

So you saying these question are there to stimulate the mind and scare those who think this is gonna be on the real test? (I hope not.)

 

[dat_student]

Are you going to post answers to these? By the way keep it up this is great

I believe the answer is nor-epinephrine

 

[dat_student]

The part of the brain that controls involuntary actions is known as the

thalamus
cerebrum
medulla
cerebellum
hypothalamus

I'd say medulla

 

[cl24uw06]

What are the two common portal systems in mammals?
A. liver and spleen
B. spleen and intestine
C. hypothalamus and spleen
D. liver and hypothalamus

 

[cl24uw06]

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

 

[cl24uw06]

A unique characteristic of a portal system is that:

A. it passes through a capillary bed
B. veins branch into capillaries
C. arteries branch into veins
D. it empties into the lymphatic system

 

[cl24uw06]

During the digestion of carbohydrates, disaccharides are converted to monosaccharides by the addition of:

A. oxygen
B. hydrogen
C. NADH
D. water

 

[cl24uw06]

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

 

[cl24uw06]

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

 

[cl24uw06]

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

 

[cl24uw06]

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

 

[cl24uw06]

A common medical problem is the blockage of bile flow from the gallbladder to the intestive by a gallstone. One result of this blockage is:

A. protein malabsorption
B. fat malabsorption
C. carbohydrate malabsorption
D. water-soluble vitamin malabsorption

 

[cl24uw06]

Gas exchange among individual cells and their immediate environment within the body depends on:

A. simple diffusion
B. osmosis
C. facilitated diffusion
D. active transport

 

[cl24uw06]

Which structure has NOT evolved to increase the surface area of an organ or structure?

A. alveoli
B. villi
C. capillaries
D. none of the above

 

[cl24uw06]

Where does the bulk of gas exchange in human lungs occur?

A. Trachea
B. Bronchi
C. Bronchioles
D. Alveoli

 

[cl24uw06]

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

 

[cl24uw06]

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

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

 

[dat_student]

What are the two common portal systems in mammals?
A. liver and spleen
B. spleen and intestine
C. hypothalamus and spleen
D. liver and hypothalamus

liver & hypothalamus

 

[dat_student]

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

 

[dat_student]

A unique characteristic of a portal system is that:

A. it passes through a capillary bed
B. veins branch into capillaries
C. arteries branch into veins
D. it empties into the lymphatic system

B. veins branch into capillaries

 

[dat_student]

During the digestion of carbohydrates, disaccharides are converted to monosaccharides by the addition of:

A. oxygen
B. hydrogen
C. NADH
D. water

d. water ?!

 

[dat_student]

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

Is it D? Insulin is also a polypeptide

 

[dat_student]

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

C. after bicarbonate release by the pancreas - B is obviously wrong & secretin is released by duodenum. bicarbonate makes the environment less acidic So it must be the right answer

 

[dat_student]

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

A. peristalsis

 

[dat_student]

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

C. duodenum, jejunum, ileum

 

[dat_student]

A common medical problem is the blockage of bile flow from the gallbladder to the intestive by a gallstone. One result of this blockage is:

A. protein malabsorption
B. fat malabsorption
C. carbohydrate malabsorption
D. water-soluble vitamin malabsorption

B. fat malabsorption

 

[dat_student]

Gas exchange among individual cells and their immediate environment within the body depends on:

A. simple diffusion
B. osmosis
C. facilitated diffusion
D. active transport

A. simple diffusion

 

[dat_student]

Which structure has NOT evolved to increase the surface area of an organ or structure?

A. alveoli
B. villi
C. capillaries
D. none of the above

I think all all do. so the answer is D.
alveoli increases the surface area of the lung
villi increases the surface area of the intestine
capillaries increase the surface area of the vascular system

 

[dat_student]

Where does the bulk of gas exchange in human lungs occur?

A. Trachea
B. Bronchi
C. Bronchioles
D. Alveoli

D. Alveoli

 

[dat_student]

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

A. epiglottis