Which describes why meiosis promotes genetic variability?
A. Meiosis produces four gametes that have half the same number of chromosomes of the parent cell
B. Meiosis produces four gametes that have twice the same number of chromosomes of the parent cell
C. Meiosis produces four gametes that have the same number of chromosomes of the parent cell
D. Meiosis produces four gametes that have four times the same number of chromosomes of the parent cell
Answer: A. Meiosis produces four gametes that have half the same number of chromosomes of the parent cell
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Answer the following statements true (T) or false (F)
1. Phylogenetic analyses of some vertebrate mineralcorticoid and glucocorticoid receptors and their ligands has suggested that the hormones evolved prior to their receptors. 2. Vasotocin is present in non-mammalian vertebrates and shares structural and functional properties with mammalian antidiuretic hormone and oxytocin. Through these similarities it has been suggested that vasotocin could be the ancestral precursor to the posterior pituitary hormone in vertebrates. 3. Vitamin D is a hormone produced in part by exposure to sunlight. 4. If blood sodium levels rise sharply above normal limits the heart will release more atrial natriuretic peptide.
In correct order, the three stages of translation are ___________.
A. initiation, replication, and termination B. elongation, peptide bond formation, and codon-anticodon pairing C. initiation, chain elongation, and termination D. termination, initiation, and replication E. initiation, codon-anticodon pairing, and termination
Which of the following best describes the role of regulatory T cells?
A) Regulatory T cells are a kind of helper T cell that stimulates B cells. B) Regulatory T cells stimulate natural killer cells to attack tumors. C) Regulatory T cells are a kind of helper T cell that stimulates cytotoxic T cells. D) Regulatory T cells stabilize and support memory cells. E) Regulatory T cells help limit the immune system response.
Amino acids can combine with either hydroxyl or hydrogen ions. As a result, they can function as
A. transfer groups. B. buffers. C. solvents. D. cations. E. salts.