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Unit 2 Practice Test
Chapter 9
1. The four bases found along the DNA double helix are
a. adenine, thymine, guanine, and cytosol
b. adenine, thyroxine, glucose, and cytosine
c. adrenaline, thymine, glucosamine, and uracil
d. adenine, thymine, guanine, and cytosine
e. none of the above
2. Chromosomes that are not involved in sex determination are called
____________________.
3. When does DNA replication take place in the cell cycle?
A) during mitosis
B) continually throughout the cell cycle
C) during cytokinesis
D) before a cell divides
E) only during G1
4. Which statement is TRUE about homologous chromosomes?
A) They include the two X chromosomes in a female.
B) They are duplicated chromosomes that have not yet been separated.
C) They contain completely different genes.
D) They include the X and Y chromosomes in a male.
E) They are exactly alike.
Chapter 10
5. In reference to chromosomes, meiosis involves
a. no duplications, 1 reduction
b. 1 duplication, 2 reductions
c. 2 duplications, 1 reductions
d. 2 duplications, 2 reductions
e. none of the above
6. Fertilization of the haploid sperm and egg results in the restoration of the
____________________ number of chromosomes in the zygote.
7. The products of meiosis are
A) two genetically identical, diploid cells.
B) four genetically identical, haploid cells.
C) four genetically identical, diploid cells.
D) two genetically different, diploid cells.
E) four genetically different, haploid cells.
8. If a eukaryotic cell has 20 chromosomes and it undergoes meiosis, how many cells
will result, and how many chromosomes will they contain?
A) 4 cells, each with 20 chromosomes
B) 4 cells, each with 10 chromosomes
C) 2 cells, each with 10 chromosomes
D) 2 cells, each with 20 chromosomes
Chapter 11
9. If plants in a cross have the following genotypes (YYRR x yyrr) the correct term for
the type of cross is:
a. recessive cross
b. dominant cross
c. monohybrid cross
d. dihybrid cross
e. codominant cross
10. The passing of traits from parents to offspring is called ____________________.
11. The D gene controls pea plant height. The DD and dd genotypes confer tall and
dwarf phenotypes, respectively. What is the relationship between D and d?
A) They are two different plant chromosomes.
B) They are two different genes on the same chromosome.
C) They are alleles of the same gene.
D) They are two possible homozygous genotypes.
E) They are two possible heterozygous genotypes.
A and a are dominant and recessive alleles, respectively, of the same gene.
12. Which genotype(s) would result in an individual with the dominant phenotype?
A) AA and aa
B) Aa and aa
C) only AA
D) AA and Aa
E) only Aa
Chapter 12
13. Inheritance of an autosomal dominant disorder differs from inheritance of an
autosomal recessive disorder in that:
a. A dominant disorder may be passed on only if both parents are affected.
b. A dominant disorder is evident only if the offspring is homozygous for the allele.
c. A dominant disorder is more often seen in females.
d. A dominant disorder may be passed on even if only one parent is affected.
e. both b and d
14. If some of the offspring of a test cross have the recessive trait, then the genotype of
the individual being tested is ____________________.
15. If a female who is a carrier for the hemophilia gene has a child with a man who does
not have hemophilia, which prediction is correct?
A) All of the sons and none of the daughters will have hemophilia.
B) All of the daughters and none of the sons will have hemophilia.
C) Half of the sons and half of the daughters will have hemophilia.
D) Half of the sons and none of the daughters will have hemophilia.
E) Half of the daughters and none of the sons will have hemophilia.
16. A recessive gene that is on a human X chromosome
A) will be expressed equally by males and females.
B) is more likely to be expressed in females.
C) is more likely be expressed if it is heterozygous.
D) is more likely to be expressed by males.
E) will never be expressed in females.
Chapter 13
17. The components of the DNA handrails are _____ and _____.
a. nucleotides, phosphates
b. sugars, nucleotides
c. sugars, bases
d. sugars, phosphates
e. none of the above
18. A DNA subunit composed of a phosphate group, a five-carbon sugar, and a nitrogencontaining base is called a(n) ____________________.
19. All of the following are bonds found in DNA molecules EXCEPT
A) phosphate to deoxyribose.
B) deoxyribose to adenine.
C) cytosine to guanine.
D) cytosine to phosphate.
E) thymine to adenine.
20. If the sequence TCGTA was used as a template in DNA replication, what would the
sequence of bases be on the newly synthesized strand?
A) ATGCT
B) CTACG
C) AGCAT
D) GCATC
E) TCGTA
Chapter 14
21. What mRNA sequence signals the start of a sequence to be translated?
a. ATG
b. UGA
c. AUG
d. UAG
e. UAA
22. Messenger RNA is produced during the process of ____________________.
23. The units of both RNA and DNA are composed of
A) codons.
B) bases A, G, C, T.
C) amino acids.
D) sugars, phosphates and bases.
E) operons.
24. If the cells in Sharon's liver began to have problems producing tRNA's, which
process, specifically, would be inhibited?
A) translation
B) replication
C) transcription
D) duplication
E) meiosis
Answers
1D
2 autosomes
3D
4A
5B
6 diploid
7E
8B
9D
10 heredity
11 C
12 D
13 D
14 heterozygous
15 D
16 D
17 D
18 nucleotide
19 D
20 C
21 C
22 transcription
23 D
24 A