Following peptide bond formation between the amino acid in the A site on the ribosome and the
growing polypeptide chain, the tRNA in the A site:a.
releases the growing polypeptide chain.
b. picks up another amino acid to add to the chain.
c. moves to the P site of the ribosome.
d. forms a peptide bond with A site of the ribosome.
e. forms a covalent bond with the P site of the ribosome
C
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Dana Reeve, the wife of actor Christopher Reeve, died at a young age from lung cancer, although she had never smoked. Her cancer was likely caused by
A) a germline mutation. B) two somatic mutations in the same lung cell. C) exposure to carcinogens. D) stress from caring for her husband, who had a spinal cord injury.
Which type of asexual reproduction involves meiosis?
1.budding 2.fission 3.fragmentation 4.parthenogenesis
Reproductive isolating mechanisms are
a. specific behaviors that allow males to compete against other males for females. b. the processes by which sexual selection evolves within a population. c. the ways that gene flow is blocked between populations. d. the ways in which individuals within a species are unable to produce fertile offspring. e. the various geographic barriers to immigration and emigration of individuals between populations.
A 42-year-old woman becomes pregnant. Her physician recommends amniocentesis (a test for fetal chromosomal disorders). When the results are analyzed by the laboratory, it is determined that the fetus has 47 chromosomes. Name and fully explain what caused
this disorder. When the woman and her husband consult a genetic counselor, they are told that this problem is likely to have occurred in the woman's egg cells, not in her 50-year-old husband's sperm cells. Explain why. What will be an ideal response?