Hi,
THE ANSWERS TO UNIT 3's PRETEST ARE AS FOLLOWS:
Meiosis,Mitosis, and Cytokinesis Pretest
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. The chromosome of a bacterium
a. is wrapped around proteins. c.
occurs in multiple pairs within the cell.
b. has a circular shape.d. is found within the nucleus.
____ 2. The chromosomes in your body
a. exist in 23 pairs in all cells but gametes.
b. each contain thousands of genes.
c. form right before cells divide
d. All of the above
____ 3. In order to fit within a cell, DNA becomes more compact by
a. breaking apart into separate genes.
b. extending to form very long, thin molecules.
c. wrapping tightly around associated proteins.
d. being enzymatically changed into a protein.
____ 4. Normal human males develop from fertilized eggs containing which of the following sex chromosome combinations?
a. XY c. XO
b. XX d. OO
____ 5. diploid : somatic cell :: haploid :
a. body cell c. gamete
b. chromosome d. zygote
____ 6. A diploid cell is one that
a. has two homologues of each chromosome.
b. is designated by the symbol 2n.
c. has chromosomes found in pairs.
d. All of the above
____ 7. If nondisjunction occurs,
a. there will be too many gametes produced.
b. no gametes will be produced.
c. a gamete will receive too many or too few homologues of a chromosome.
d. mitosis cannot take place.
____ 8. A mutation caused by a piece of DNA breaking away from its chromosome and becoming attached to a nonhomologous chromosome is called
a. deletion.c. inversion.
b. duplication d. translocation.
____ 9. Trisomy is a mutation that results in a cell having an extra
a. nitrogen base. c. chromosome.
b. codon. d. gene.
____ 10. Which of the following shows the correct sequence of the cell cycle?
a. C ® M ® G1 ® S ® G2 c. G1 ® S ® G2 ® M ® C
b. S ® G1 ® G2 ® M ® C d. None of the above
____ 11. The synthesis (S) phase is characterized by
a. DNA replication.
b. cell division.
c. replication of mitochondria and other organelles.
d. the division of cytoplasm.
____ 12. Mitosis is the process by which
a. microtubules are assembled. c. the nucleus is divided into two nuclei.
b. cytoplasm is divided. d. the cell rests.
____ 13. The first three phases of the cell cycle are collectively known as
a. cellular respiration. c. mitosis.
b. telophase. d. interphase.
____ 14. The cell cycle is monitored as each cell passes through
a. cellular respiration. c. photosynthesis.
b. checkpoints.d. homeostasis.
____ 15. Normal cells become cancer cells when
a. regulation of cell growth and division is lost.
b. cells do not respond normally to control mechanisms.
c. cells continue to divide without passing through G1.
d. All of the above
____ 16. A spindle fiber is a specialized form of
a. microtubule.c. cilium.
b. flagellum.d. chromosome.
____ 17. As a result of mitosis, each of the two new cells produced from the parent cell during cytokinesis
a. receives a few chromosomes from the parent cell.
b. receives an exact copy of all the chromosomes present in the parent cell.
c. donates a chromosome to the parent cell.
d. receives exactly half the chromosomes from the parent cell.
____ 18. Refer to the illustration above. Mitosis begins with the stage shown in diagram
a. 1.c. 3.
b. 2. d. 4.
____ 19. Refer to the illustration above. The cell shown in diagram 5 is in
a. metaphase.c. anaphase.
b. telophase.d. prophase.
____ 20. Mitosis is a process by which
a. DNA is replicated. c. cells grow in size.
b. cytokinesis occurs d. a cell’s nucleus divides.
____ 21. Refer to the illustration above. During which stage do the centromeres divide?
a. A c. C
b. B d. D
____ 22. Cytokinesis in plant cells involves the formation of
a. replicated chromosomes. c. spindle fibers.
b. a cell plate. d. centrioles.
____ 23. Refer to the illustration above. The process shown in the diagrams is
a. mitosis. c. meiosis.
b. chromosomal mutation. d. dominance.
____ 24. Separation of homologues occurs during
a. mitosis. c. meiosis II.
b. meiosis I. d. fertilization.
____ 25. When crossing-over takes place, chromosomes
a. mutate in the first division.
b. produce new genes.
c. decrease in number.
d. exchange corresponding segments of DNA.
Using the information you have learned about cell reproduction, infer answers to the questions below about a cell with a diploid number of 4 chromosomes. Select from among the diagrams below, labeled A, B, C, D, and E, to answer the questions.
____ 26. Which of the diagrams above depicts a cell at the beginning of mitosis?
a. B c. D
b. C d. E
____ 27. Which of the diagrams above depicts a cell at the end of meiosis II?
a. A c. C
b. B d. D
____ 28. Which of the diagrams above depicts a cell at the end of mitosis?
a. A c. C
b. B d. D
____ 29. The exchange of segments of DNA between the members of a pair of chromosomes
a. ensures that variations within a species never occur.
b. acts as a source of variations within a species.
c. always produces genetic disorders.
d. is called crossing.
____ 30. Which of the following does not provide new genetic combinations?
a. random fertilization c. independent assortment
b. cytokinesis d. crossing-over
____ 31. During cytokinesis in the female, what divides unequally?
a. the sperm cell c. the cytoplasm
b. the ovary d. None of the above
____ 32. The process of producing offspring is called reproduction and can be
a. eukaryotic or prokaryotic. c. cardiovascular or respiratory.
b. asexual or sexual. d. None of the above
____ 33. Types of asexual reproduction include
a. budding. c. fission.
b. fragmentation. d. All of the above
____ 34. The simplest and most primitive method of reproduction is
a. sexual. c. haploid.
b. diploid. d. None of the above
____ 35. Which of the following is not a type of sexual life cycle?
a. alternation of generations c. diploid
b. haploid d. cellular
Meiosis,Mitosis, and Cytokinesis Pretest
Answer Section
MULTIPLE CHOICE
1. B
2. D
3. C
4. A
5. C
6. D
7. C
8. D
9. C
10. C
11. A
12. C
13. D
14. B
15. D
16. A
17. B
18. B
19. B
20. D
21. A
22. B
23. C
24. B
25. D
26. C
27. A
28. B
29. B
30. B
31. C
32. B
33. D
34. D
35. D
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