Which is NOT a class of antibiotic resistance mechanism?
a. modification of the drug target
b. removal from the cell via efflux pump
c. disruption of membrane structure
d. enzymatic inactivation
Answer: C
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In the cross AaBbCc à— AaBbCc, what is the probability of producing the genotype AABBCC?
A) 1/4 B) 1/8 C) 1/16 D) 1/32 E) 1/64
Which of the following actions occurs in many plants when CO2 concentrations are high?
A. Guard cells lose turgor, and the stomata close. B. Water evaporates at a higher rate than usual. C. CAM photosynthesis fixes CO2 at night. D. Oxygen is used by plants for photosynthesis. E. Calcium ions are transported faster through the phloem.
The number of sperm cells that form from a primary spermatocyte is
A) 2. B) 4. C) 16. D) 100.
Ecosystem diagrams help us visualize the flow of ___________.
A. matter and energy B. rivers and streams C. seasonal change D. happiness E. goods and services