Which of the following does NOT lead to development of penicillin resistance?
a) acquisition of a beta-lactamase gene
b) direct binding to the bacterial ribosome
c) loss of transpeptidase affinity for penicillin
d) a modification in the cell wall that blocks penicillin entry
Answer: b) direct binding to the bacterial ribosome
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An organized group of specialized cells is called a(n) organ
Indicate whether the statement is true or false.
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.
All of the following are true for Amoebas except the following:
A. Eat by diffusion B. Are part of the phylum Rhizopods C. Move by pseudopod D. Is a animal like protist
Figure 29.12 C
Use the accompanying figure of a Capsella seed to answer the following question.
The embryonic root tip is indicated by the letter ____.
A. A B. B C. C D. D E. E