Before cell division of somatic cells, each chromosome must be replicated. After replication, the resulting two parts of each chromosome are held together by cohesin at the centromere. These two parts are referred to as
A. genes.
B. homologous chromosomes.
C. daughter chromosomes.
D. sister chromatids.
E. kinetochores.
Answer: D
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A cross of a true-breeding smooth pod and yellow pod plants results in all smooth pod offspring. This indicates that
A. yellow is dominant and smooth is recessive. B. smooth is dominant and yellow is recessive. C. yellow and smooth are not alleles. D. yellow and smooth are variants of the same gene. E. two of the answers are correct. Yellow and smooth are variants of the same gene, and smooth is the dominant trait.
Why are skin grafts between identical twins more successful than grafts between more unrelated individuals?
a. Identical twins share the same uterine environment. b. Identical twins are exactly matched in age c. Identical twins have identical HLA alleles. d. Identical twins are always the same sex. e. Identical twins have the same blood type.
Which of the following is a major function of the ovaries?
A. They manufacture the sex hormones, estrogen and progesterone. B. They comprise the canal through which babies are delivered. C. They are the organs directly responsible for a woman's orgasm. D. They hold and nourish the developing fetus.
The largest amount of energy is obtained from
A. the Krebs cycle. B. glycolysis. C. fermentation. D. the electron transport system.