BIO 191 Supplemental Instruction
Practice Exam 3
1.
Which of the following does not occur by mitosis?
a. Growth
b. Production of gametes
c. Repair
d. Development in the embryo
e. Cleavage
The following two questions refer to the sketch below of the cell containing chromosomes.
2. How many chromosomes are in this cell?
a. 2
b. 4
c. 8
d. 16
e. 32
3. How many chromatids are in this cell?
a. 2
b. 4
c. 8
d. 16
e. 32
4. In which stage of the life of a cell is the nucleolus always visible?
a. Prophase
b. Anaphase
c. Telophase
d. Cytokinesis
e. Interphase
5. If a cell has 24 chromosomes at the beginning of meiosis, how many chromosomes will it
have at the end of meiosis?
a. 6
b. 12
c. 24
d. 48
e. The number varies with species
6. If a cell has 24 chromosomes, how many will it have at the end of mitosis?
a. 6
b. 12
c. 24
d. 48
e. The number varies with species
7. All of the following are true of meiosis EXCEPT
a. Crossover occurs during prophase I
b. There is no replication of chromosomes between meiosis I and meiosis II
c. In plants, spindle fibers are attached to the centriole
d. Synapsis occurs during prophase I
e. The longest phase is prophase
8. Homologous chromosomes separate during
a. Prophase I
b. Prophase II
c. Anaphase of mitosis
d. Anaphase I
e. Anaphase II
9. Which of the following is NOT a source of genetic variation?
a. Independent assortment of chromosomes
b. Crossover
c. Random fertilization
d. Mitosis
e. Recombinant chromosomes
10. Which of the following is TRUE about a testcross?
a. It is a mating between two hybrid individuals
b. It is a mating between a hybrid individual and a homozygous recessive individual
c. It is a mating between a homozygous dominant individuals and a homozygous
recessive individual
d. It is a mating to determine which individual is homozygous recessive
e. It is a mating between an individual of unknown genotype and a homozygous
recessive individual
11. All are true of a crossover EXCEPT?
a. It normally occurs between sister chromatids
b. It is the site of a chiasma
c. It is responsible for linked genes being inherited separately
d. It cannot occur between sex chromosomes in human males
e. It is a common event
12. A round watermelon is crossed with a long watermelon and all of the offspring are oval. If
two oval watermelons are crossed, what is the percent of watermelons that will be round?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
13. A diploid cell has three pairs of homologous chromosomes: AaBbCc. How many different
gametes can this cell produce?
a. 4
b. 8
c. 16
d. 32
e. 64
14. In peas, the trait for tall plants is dominant (T) and the trait for short plants is recessive (t).
The trait for yellow sees is dominant (Y) and trait for green seeds is recessive (y). A cross
between two plants results in 292 tall yellow plants and 103 short green plants. Which of the
following are most likely to be the genotypes of the parents?
a. TtYY and Ttyy
b. TTYy and TTYy
c. TTyy and TTYy
d. TtYy and TtYy
e. TtYy and TTYy
15. An organism has three independently assorting traits: AaBbCc. What fraction of gametes
will contain the dominant genes ABC?
a. 1
b. 1/8
c. ¼
d. ½
e. 3/8
16. The expression of both alleles for a trait in a hybrid individual is
a. Pleiotropy
b. Epistasis
c. Codominance
d. Complementation
e. Incomplete dominance
17. A couple has 6 children, all girls. If the mother gives birth to a seventh child, what is the
probability it will be a girl?
a. 6/7
b. 1/128
c. ½
d. 1
e. Not enough information is given
18. Two traits, A and B are linked, but they are not always inherited together. The most likely
reason is
a. They are not on the same chromosome
b. They are not sex-linked
c. They are on the same chromosome but are far apart
d. They are close together on the same chromosome
e. A is dominant over B
19. A man who has a sex-linked allele will pass it on to
a. All of his daughters
b. All of his sons
c. ½ of his daughters
d. ½ of his sons
e. All of children
The following four questions refer to the following five choices:
A) Translation
B) Replication
C) Transcription
D) Transformation
E) Terminaiton
20. The process in which DNA makes mRNA
21. The process in which DNA is synthesized from a template strand
22. The process in which foreign DNA is taken up by a bacterial cell
23. The process in which a polypeptide strand is synthesized using mRNA as a template
24. In DNA replication, the role of DNA polymerase is to
a. Bring two separate strands back together after new ones are formed
b. Join the RNA nucleotides together to make the primer
c. Build a new strand of DNA from 5 prime to 3 prime
d. Unwind the tightly wound helix
e. Join the oakazki fragments
25. DNA replication can best be described as
a. Semiconservative
b. Conservative
c. Degenerative
d. Comparative
e. The same in eukaryotes and prokaryotes
The following four questions refer to the following five choices:
A) Hershey and Chase
B) Watson and Crick
C) Meselsohn and Stahl
D) Rosalind Franklin
E) Griffith
26. Discovered transformation in bacteria
27. Proved that DNA replicates by semiconservative replication
28. Proved that the nuclear material in a bacteriophage, not the protein coat, infects bacteria
29. The first to analyze DNA by X-ray crystallography
30. If a segment of DNA is 5-TGA AGA CCG-3, the RNA that results from the transcription of
this segment will be
a. 5-TGA AGA CCG-3
b. 3-GCC AGA AGR-5
c. 3-ACT TCT GGC-5
d. 3-CGG UCU UCA-5
e. 3-ACU UCU GGC-5
31. Which of the following contain a pyrimidine and purine?
a. Adenine and guanine
b. Uracil and thymine
c. Cytosine and uracil
d. Adenine and cytosine
e. Cytosine and thymine
32. Which of the following acts as a primer that initiates the synthesis of a new strand of DNA?
a. Single stranded binding proteins
b. RNA
c. DNA
d. Topoisomerases
e. Ligase
33. If guanine makes up 28% of the nucleotides in a sample of DNA from the organism, then
thymine would make up ___% of the nucleotides.
a. 28
b. 56
c. 22
d. 44
e. 0
34. If AUU is the codon, what is the anticodon?
a. AUU
b. TAA
c. UUA
d. UAA
e. TUU
35. What region of DNA code for proteins?
a. Introns
b. Codons
c. Anticodons
d. Exons
e. Transposons