Download Indicate the answer choice that best completes the

Name: Class: Date: Unit 2 Pre test
Indicate the answer choice that best completes the statement or answers the question.
1. Which of the following would be least likely to happen as a result of a mutation in a person's skin cells?
a. skin cancer
b. reduced functioning of the skin cell
c. no change in functioning of the skin cell
d. the person's offspring have mutated skin
2. How can cancer cells be described?
a. completing abnormal mitosis
b. dividing out of control
c. lacking essential nutrients
d. shrinking to a small size
3. A pea plant homozygous for the trait of smooth seeds is crossed with a pea plant that is homozygous for the trait
of wrinkled seeds. The first generation produces seeds that are all smooth. What percent of the secondgeneration plants will have smooth seeds when the F1 generation is self-fertilized?
a. 100%
c. 50%
b. 75%
d. 25%
4. The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human
sperm?
a. 23
b. 45
c. 46
d. 92
5. How can apoptosis be defined?
a. cell death
b. cell growth
c. complete mitosis
d. incomplete mitosis
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Name: Class: Date: Unit 2 Pre test
Figure 10-7
6. What fraction of this cross will be recessive for both traits?
a. 1/2
b. 1/4
c. 1/8
d. 1/16
7. Which description best fits the activity of a cell during interphase?
a. The cell carries on metabolism.
b. The cell differentiates to have a new function.
c. The cell splits in two.
d. The cell splits in two but with half the normal number of chromosomes.
8. The diagram below shows a portion of a DNA molecule. The letters in the diagram represent the four bases:
adenine (A), thymine (T), guanine (G), and cytosine (C). Which sequence of bases do the question marks
represent?
a. C-A-C
b. G-C-A
c. G-A-C
d. T-C-A
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Name: Class: Date: Unit 2 Pre test
Figure 11-2
9. According to the pedigree in Figure 11-2, how many of the offspring in the III generation show the normal trait?
a. 1
b. 2
c. 4
d. 5
10. Which description best identifies characteristics of asexual reproduction?
a. one parent, union of gametes, offspring similar to but not genetically identical to the parent
b. one parent, no union of gametes, offspring genetically identical to the parent
c. two parents, union of gametes, offspring similar to but not genetically identical to parents
d. two parents, no union of gametes, offspring genetically identical to the parents.
11. The cell cycle is regulated by
a. cyclins
b. enzymes
c. hormones
d. sugars
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Name: Class: Date: Unit 2 Pre test
Figure 11-6
This pedigree shows the transmission of a rare disease that is debilitating but not lethal. Carriers are not shown.
12. Which type of heredity does the pedigree in Figure 11-6 demonstrate?
a. autosomal recessive
b. autosomal dominant
c. X-linked recessive
d. X-linked dominant
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Name: Class: Date: Unit 2 Pre test
Figure 11-1
13. What is the relationship between individual I-1 and individual III-2 in Figure 11-1?
a. grandfather-granddaughter
b. grandmother-grandson
c. great aunt-nephew
d. mother-son
14. Which series is arranged in order from largest to smallest in size?
a. chromosome, nucleus, cell, DNA, nucleotide
b. cell, nucleus, chromosome, DNA, nucleotide
c. nucleotide, chromosome, cell, DNA, nucleus
d. cell, nucleotide, nucleus, DNA, chromosome
15. During which stage of the cell cycle does the cell duplicate its DNA?
a. M stage
b. G1 stage
c. S stage
d. G2 stage
16. What is the role of cyclin-dependent kinases in the cell cycle?
a. They stop the cycle if something has gone wrong.
b. They catalyze the condensation of the chromosomes.
c. They provide the energy for the actions of the spindle fibers.
d. They initiate various stages of the cell cycle.
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Name: Class: Date: Unit 2 Pre test
17. Which is the number of chromosomes in a haploid cell?
a. 1n
b. 2n
c. 3n
d. 4n
18. A heterozygous organism is best described as which of these?
a. dominant
b. genotype
c. hybrid
d. true-breeding
19. The tall allele, T, is dominant to the short allele, t, in Mendel’s pea plants. You examine a pea plant that exhibits
the tall phenotype. What is its genotype?
a. Tt
b. TT
c. tt
d. A and B are both possible.
20. What are the structures labeled A in the drawing?
a. chromatids
b. centrioles
c. spindle fibers
d. centromeres
21. A true-breeding tall pea plant is crossed with a true-breeding short pea plant, and all the offspring are tall. What
is the most likely genotype of the offspring assuming a single-gene trait?
a. tt
b. Tt
c. TT
d. TT or tt
22. What is cancer caused by?
a. cell-membrane damage
c. mutation
b. metabolic poisoning
d. immune-system damage
23. Which statement describes the number of chromosomes in a newly formed cell after mitosis?
a. They are double the number of the parent cell.
b. They are half the number of the parent cell.
c. They are equal to the number of the parent cell.
d. They are double the number of two parent cells.
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24. A researcher crosses the F1 generation of two snapdragon plants. According to this information and the diagram
below, what is the ratio of their offspring (F2)?
a. 0 red; 4 pink; 0 white
b. 1 red; 2 pink; 1 white
c. 3 red; 0 pink; 1 white
d. 4 red; 0 pink; 0 white
25. Which is the function of the DNA helicase enzyme in the DNA replication process?
a. coils new DNA strands
b. joins DNA to RNA primer
c. matches nucleotide pairs
d. unwinds the double helix
26. A woman who is not colorblind is married to a man who is not colorblind. They have, however, a son who is redgreen colorblind. What is the mother’s genotype?
a. XBXB
b. XBXb
c. XbXb
d. XBX
27. What is the genotype of a woman with red-green color blindness?
a. Xb Xb
b. XB XB
c. Xb Y
d. XB Y
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28. Which diagram represents the process of sperm formation in an organism that has a diploid chromosome number
of eight?
a. b. c. d. Figure 9-2
29. If cancer is present, what is the likely explanation for what happened to the cells depicted in the curves labeled B
and D in Figure 9-2?
a. They thrived with the cancerous cells.
b. They were harmed by radiation therapy.
c. They died off due to natural causes.
d. They died off because the cancerous cells deprived them of nutrients.
30. A cell that is undergoing mitosis is examined with a light microscope. An observation that would allow for
identification of the cell as an animal cell rather than a plant cell would be
a. the centrioles migrating.
b. the chromosome pairs separating from each other.
c. the chromosomes twisting about each other.
d. the nucleoli disappearing.
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Name: Class: Date: Unit 2 Pre test
Answer Key
1. d
2. b
3. b
4. a
5. a
6. d
7. a
8. c
9. c
10. b
11. a
12. c
13. b
14. b
15. c
16. d
17. a
18. c
19. d
20. c
21. b
22. c
23. c
24. b
25. d
26. b
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Name: Class: Date: Unit 2 Pre test
27. a
28. d
29. d
30. a
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