Review Questions Flashcards
Paramecium is a single-cell eukaryotic
organism that can reproduce by mitotic cell
division. Prior to the M phase of the cell cycle,
which of the following must occur?
A. The cell must replicate its chromosomes.
B. The cell must first be fertilized.
C. The nucleus must divide.
D. Sister chromatids must be separated.
E. The nuclear envelope must disintegrate.
A) the cell must replicate its chromosomes
Select the best statement
A) Mitosis occurs in only in sperm and egg cells
B) Mitosis occurs in the stem cells in my colon
C) Mitosis and Meiosis occur in the stem cells in my hair follicles
D) A and C are correct
B) Mitosis occurs in the stem cells in my colon
If the early zebrafish embryo undergoes cell
division every 20 minutes, what do you think
is happening with the cell cycle?
A. Every stage of the cell cycle is dramatically
shorter
B. Only the G1 and G2 phases are very, very
short.
C. The cells go right to G 0
D. Only the M phase is very, very short
E. Only the S phase is very, very short.
B) only the G1 and G2 phases are very, very short
All of the following happen during mitosis
except:
A. condensing of chromosomes.
B. synthesis of DNA.
C. formation of the spindle.
D. separation of sister chromatids at the
centromeres.
B) synthesis of DNA
Given that the correct number of chromosomes is
vital to the proper functioning of a cell, which of
the statements below is correct if a cell passes
from G1 to S phase in the cell cycle?
A. The cell copies its chromosomes and enters G 2
or it returns to G1 .
B. The cell completes the process of cell division or
it dies.
C. The cell divides or it returns to G1 and enters G0
B. The cell completes the process of cell division or
it dies.
During meiosis II:
A. Bivalents are formed during prophase II and
are taken apart during anaphase II.
B. Chromosomes undergo synapsis.
C. Sister chromatids are separated.
D. Non-sister chromatids exchange maternal and
paternal DNA.
E. All of these choices are correct.
D) sister chromatids are seperated
Which of the following is NOT true about gamete formation in mammals?
A) In the female, the separation of cytoplasm is unequal during meiosis
B) Only one of four cells resulting from meiosis goes on to become oocyte
C) The polar bodies formed during meiosis in the female can participate in fertilization with sperm
D) The cytoplasm is diminished during development of sperm, and a flagellum is formed to give sperm locomotion
C) The polar bodies formed during meiosis in the female can participate in fertilization with sperm
Mendel determined that for a given character, such
as pea seed shape, an individual has two factors and
that these can exist in two forms (R or r). Today we
would describe R and r as being:
a. different genes of the seed shape locus.
b. different loci of the seed shape gene.
c. different alleles of the seed shape gene.
d. different genotypes of the seed shape
character.
e. different traits of the seed shape character.
c. different alleles of the seed shape character.
According to Mendel’s second law, when the different alleles for one trait separate into gametes, the separation:
a) is dependent upon how different alleles for other traits separate
b) is independent of how different alleles for other traits separate
c) occurs so as to prevent recessive alleles of two different genes from occupying the same gamete
d) occurs so that the recessive alleles of different genes always occupy the gamete
b) is independent of how different alleles for other traits separate
Two parents are both carriers for a fatal autosomal recessive
disease. What is the probability of their living children being
carriers?
a. 25%
b. 1/3
c. 66%
d. 1/4
e. 100%
c. 66%
A mutation caused by the addition of a
nucleotide base would be considered:
a. Nonsense
b. Insertion
c. Missense
d. Frameshift
e. Both b and d
e. Both b and d
For the genotype AABb, how many different
types of gametes are possible?
a. 4
b. 1
c. 3
d. 2
e. X and Y
d. 2
In a cross between and individual with the genotype AaBb and an individual with the genotype aaBB what proportion of the offspring would have the genotype aaBB (same as parent 2)
a. 1/4
b. 1/2
c. 3/4
d. 1/8
e. All would have the same genotype
a. 1/4
A strand of mRNA has the sequence:
5’-UCAGCCG-3’
Select from the following sequences, the single-
stranded DNA from which is was transcribed.
a. 5’-AGTCGGC-3’
b. 3’-TCAGCCG-5’
c. 5’-TCAGCCG-3’
d. 3’-AGTCGGC-5’
e. 3’-ACTGCGC-5’
d. 3’-AGTCGGC-5
During Meiosis homologous pairs line up in center of
cell, with bivalents oriented randomly with respect to
each other during:
a. Anaphase I
b. Metaphase II
c. Prophase I
d. Metaphase I
e. Telophase I
d. Metaphase I
