Download Chapter 3 Exam

Name: ___________________________________ Date: ______________
1. Active transport requires proteins because they
A) move molecules along a concentration gradient.
B) are necessary for cell metabolism.
C) are required for osmosis.
D) require no energy from the cell.
E) move molecules against the concentration gradient.
2. Pinocytosis and phagocytosis involve structural changes in the
A) cytoplasm.
B) plasma membrane.
C) ribosomes.
D) mitochondria.
E) cell nucleus.
3. The movement of molecules across a plasma membrane from an area of low concentration to
an area of high concentration requires
A) cellular energy.
B) facilitated diffusion.
C) integral proteins.
D) cellular energy and facilitated diffusion.
E) cellular energy and integral proteins.
4. Which of the following is necessary for diffusion to take place?
A) a concentration gradient
B) a selectively permeable membrane
C) a hypertonic solution
D) cellular energy
E) All of the above.
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5. A semipermeable membrane, which permits water movement but not ion movement,
separates two solutions. Solution A contains 0.9% NaCl and solution B contains 9.0 %
NaCl. With respect to this system, which of the following statements would be true?
A) water would move from solution A to solution B
B) water would move from solution B to solution A
C) Na+ would move from solution A to solution B
D) Na+ would move from solution B to solution A
E) no net movement of water or ions would occur
6. Which diagram and picture in the figure below would best represent the results obtained
when placing red blood cells into a hypertonic solution?
A)
B)
C)
D)
E)
A and D
B and E
C and F
A and E
B and F
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7. As many as 60 different digestive enzymes are found in
A) Golgi complexes.
B) rough endoplasmic reticulum.
C) smooth endoplasmic reticulum.
D) lysosomes.
E) mitochondria.
8. The major function of the ribosomes is to:
A) coordinate lipid synthesis.
B) synthesize proteins.
C) detoxify drugs and alcohol.
D) act as the cell's garbage disposer or digestive system.
E) form vesicles.
9. The process by which worn-out cell organelles are digested is called
A) autolysis.
B) autoregulation.
C) autophagy.
D) lysis.
E) phagocytosis.
10. The cell organelle primarily responsible for transforming food energy into ATP energy is
the:
A) ribosome.
B) mitochondria.
C) lysosome.
D) Golgi Apparatus
E) nuclear envelope
11. The human somatic cells contain __________ chromosomes.
A) 46
B) 23
C) 43
D) 24
E) 54
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12. Which of the following is a component of RNA only?
A) andenine
B) cytosine
C) guanine
D) thymine
E) uracil
13. A CGT base triplet on DNA is copied into mRNA as
A) CAT.
B) GCA.
C) GCU.
D) ACU.
E) TGC.
14. When a particular protein is complete, synthesis is ended by a special
A) anticodon.
B) amino acid.
C) stop codon.
D) start codon.
E) carrier protein.
15. A protein is defined by the sequence of its
A) fatty acids.
B) amino acids.
C) molecules.
D) atoms.
E) enzymes.
16. The assembly of microtubules that is responsible for the movement of chromosomes during
anaphase is called the
A) centromere.
B) chromosome.
C) chromatin.
D) basal body.
E) mitotic spindle.
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17. The final stage of mitosis is
A) prophase.
B) interphase.
C) anaphase.
D) telophase.
E) metaphase.
18. The spread of cancerous cells to other parts of the body is referred to as
A) hyperplasia.
B) metastasis.
C) malignancy.
D) mutation.
E) hypertrophy.
19. Orderly, programmed cell “death” is called:
A) anaphase
B) atrophy
C) apoptosis
D) adenopathy
E) adenoma
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Answer Key - Chapter 3 Exam
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