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Multiple Choice Quiz
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1

The nucleus envelope is a bilayered structure which has numerous pores.
A)True
B)False
2

The gelatinous fluid inside the nucleus is called nucleoplasm.
A)True
B)False
3

Prior to replication the DNA in the nucleus is in the form of a tangled mass called chromatin.
A)True
B)False
4

Blood cells placed in pure water will burst because there is a net movement of water out of the cell.
A)True
B)False
5

Diffusion is the movement of water molecules across a semi-permeable membrane which continues until equilibrium has been reached.
A)True
B)False
6

Bacterial DNA is located in:
A)the nucleus.
B)the nucleoid region.
C)the nucleolus.
D)the nucleoli.
E)both a and b
7

Which of the following is found in BOTH prokaryotic and eukaryotic cells?
A)Mitochondria
B)A nucleus
C)Chloroplasts
D)Ribosomes
E)Endoplasmic reticulum
8

The movement of chromosomes during mitosis is due to the:
A)shortening of microtubules to which they are attached.
B)lengthening of microtubules to which they are attached.
C)shortening of microfilaments to which they are attached.
D)lengthening of microfilaments to which they are attached.
E)attraction of DNA to the centrioles.
9

9 + 2 arrangement refers to the:
A)structure of prokaryotic flagella.
B)structure of eukaryotic flagella.
C)structure of prokaryotic cilia.
D)structure of eukaryotic cilia.
E)both b and d.
10

Human egg cells obtain nutrients while maturing when surrounding cells:
A)are ingested by the egg cell.
B)secrete nutrients which the egg cell takes in by pinocytosis.
C)lyse to release their contents.
D)encase them in a coating of nutrients.
E)deliver carbohydrates and proteins.
11

Which of the following would be a problem for a cell if it were able to grow to twice its normal size?
A)water retention
B)salt balance
C)reproduction
D)intracellular communication
E)communication between different types of cells
12

The cell theory states that
A)cells arise spontaneously.
B)cells arise from preexisting cells.
C)cells are the smallest unit of life.
D)organelles can survive when separated from cells.
E)both b and c.
13

Which portion of a phospholipid molecule would be facing the environment outside of the cell?
A)the polar head
B)the nonpolar head
C)the polar tail
D)the nonpolar tail
E)both a and d
14

Which portion of a phospholipid molecule would be facing the interior of the cell?
A)the polar head
B)the nonpolar head
C)the polar tail
D)the nonpolar tail
E)both b and d
15

Which portion of a phospholipid molecule is repelled by water?
A)the polar head
B)the nonpolar head
C)the polar tail
D)the nonpolar tail
E)none of the above
16

Membrane proteins
A)exist in fixed positions within the plasma membrane.
B)move freely within the plasma membrane.
C)are involved in cell-to-cell recognition.
D)are always large enough to span the entire width of the plasma membrane.
E)are absent in animal cells.
17

How might viruses play a role in curing cystic fibrosis?
A)Viruses could remove the defective gene from lung cells in persons with cystic fibrosis.
B)Viruses could repair the defective gene in lung cells in persons with cystic fibrosis.
C)Viruses could identify the defective gene for later removal.
D)Viruses could deliver a copy of the normal gene to lung cells in persons with cystic fibrosis.
E)Viruses cannot possibly play a role in curing cystic fibrosis.
18

Which of the following exhibit the 9 + 2 structure of microtubules?
A)flagella
B)cilia
C)sensory hairs in the human ear
D)basal body
E)all of the above
19

Centrioles may have originated as
A)a unique arrangement of microtubules found in some prokaryotic species.
B)protein fibers produced by ribosomes in some eukaryotic cells.
C)protozoans that formed an endosymbiotic relationship with primitive aerobic prokaryotes.
D)spirochetes that became involved in an endosymbiotic relationship.
E)locomotor structures.
20

Access to the nucleus is regulated by
A)specialized proteins within the nuclear pore.
B)the rate of osmosis.
C)the amount of ATP available for active transport.
D)hormones.
E)the nucleolus.
21

A busy student pours herself a cup of coffee and adds a sugar cube. A moment later the phone rings so she doesn't have time to stir it. Ten minutes later she returns to her coffee, and when she tastes it, it is obvious that the sugar has dissolved and that the coffee is uniformly sweet. What happened?
A)Osmosis has caused the sugar molecules to move down the concentration gradient until they were evenly distributed in the coffee.
B)Facilitated diffusion has occurred and has caused the sugar molecules to dissolve in the coffee.
C)Diffusion has occurred in the coffee causing the sugar to become evenly distributed.
D)Active transport has occurred using the heat in the coffee as a source of energy.
E)None of the above.
22

The sugar molecules in the coffee mentioned above bounce and jostle each other because they have
A)kinetic energy.
B)potential energy.
C)static energy.
D)random energy.
E)occasional energy.
23

Water molecules crossing a plasma membrane do so by
A)osmosis.
B)diffusion.
C)facilitated diffusion.
D)active transport.
E)transport by the sodium-potassium pump.
24

Which of the following is a requirement for osmosis to occur?
A)a semipermeable membrane
B)a concentration gradient
C)sugar or salt molecules dissolved in water
D)an energy source
E)all of the above
25

What advantage would a plant cell have over an animal cell if both were placed in pure water?
A)The plant cell would resist shrinking in pure water.
B)The plant cell would resist bursting in pure water.
C)The plant cell would reproduce at a faster rate in pure water.
D)Both a and c.
E)None of the above.
26

The release of insulin from certain human cells is an example of
A)endocytosis.
B)exocytosis.
C)phagocytosis.
D)pinocytosis.
E)both a and b.
27

An amoeba is engulfing bacterial cells by surrounding them with a pseudopod. This is an example of
A)endocytosis.
B)exocytosis.
C)phagocytosis.
D)pinocytosis.
E)both a and c.
28

The removal of waste products from the amoeba is an example of
A)endocytosis.
B)exocytosis.
C)phagocytosis.
D)pinocytosis.
E)both a and c.
29

Diffusion of molecules across biological membranes that requires channels is called
A)active transport.
B)the sodium-potassium pump.
C)facilitated diffusion.
D)osmosis.
E)none of the above.
30

The sodium-potassium pump functions to
A)remove sodium and potassium ions from the cell.
B)pump sodium and potassium ions into the cell.
C)pump potassium ions into the cell and sodium ions out of the cell.
D)pump sodium ions into the cell and potassium ions out of the cell.
E)pump sodium and potassium ions into the cell and calcium out of the cell.
31

A liver cell would detect the presence of insulin by
A)means of receptor proteins on its surface.
B)means of receptor carbohydrates on its surface.
C)producing insulin detection binding molecules.
D)the reduction of glucose in the external environment.
E)both a and b.





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