When homologous chromosomes cross over, what occurs?
A) Two chromatids get tangled, resulting in one re-sequencing its DNA.
B) Two sister chromatids exchange identical pieces of DNA.
C) Corresponding segments of non-sister chromatids are exchanged.
D) Maternal alleles are "corrected" to be like paternal alleles and vice versa.
C
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Which of the following statements about oocytes and ovulation is correct?
a. the production of primary oocytes continues in women from the onset of puberty until the onset of menopause b. meiotic divisions are complete at the time of ovulation c. at ovulation, the structure released from the follicle includes a secondary oocyte and polar body d. all of the statements are correct
The following graph represents the concentration of cyclins over the course of the cell cycle. Which of the following statements is TRUE regarding the cell cycle where the red arrow is pointing?
A. CDK proteins are actively phosphorylating proteins that are involved in DNA replication.
B. CDK proteins are actively phosphorylating proteins that are responsible for assembling the mitotic spindle.
C. CDK proteins are actively phosphorylating and activating cyclins so that the cell will prepare to replicate its DNA.
D. CDK proteins are actively phosphorylating and activating cyclins so that the cell will properly assemble the spindle apparatus.
E. CDK proteins are actively phosphorylating regions of the DNA that need to be targeted for DNA repair.
Which of the following types of molecules is found in the thick myofilaments?
A. Actin B. Myosin C. Troponin D. Tropomysin
Mendel imagined that seed color in pea plants is influenced by a gene with two alleles in which the allele for yellow seeds (Y) is dominant over the allele for green seeds (y). What would Mendel predict the seed colors would be from a cross of a male plant with the mixed Yy genotype with a female plant with the yy genotype?
a. All seeds should be green. b. All seeds should be yellow. c. There should be 3 green seeds for every 1 yellow seed. d. There should be 1 green seed for every 3 yellow seeds. e. There should be 1 green seed for every 1 yellow seed.