Methylene blue in EMB agar is selective for
A) gram-positives.
B) gram-negatives.
C) viral plaques.
D) both gram-positives and gram-negatives.
Answer: B
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An individual who is attracted to light is exhibiting
(a) negative phototaxis. (b) positive phototaxis. (c) negative thigmotaxis. (d) positive thigmotaxis.
Antigens interact with antibodies at
A. the outer end of each arm of the Y. B. the junction of heavy and light chains. C. different regions depending on the class of antibody. D. the bottom stem of the heavy chain of the Y.
The term reproductive isolation mechanism refers to ____
a. specific areas where males compete or display for females b. the process by which sexual selection evolves within a population
c. a blockage of gene flow between populations d. the inability of a species to continue reproduction e. legal limits to procreation
Which of the following statements regarding the G1 (first gap) phase of the eukaryotic cell cycle is NOT true?
A. If DNA is heavily damaged, checkpoint proteins will delay the cell cycle; the damage will either be fixed or cell division will be permanently stopped. B. Most cells spend the majority of their lives in the G1 phase of the cell cycle. C. Cells that are terminally differentiated and will not divide mitotically might exit the G1 phase and enter the G0 phase. D. The G1 phase is only part of interphase. E. If environmental conditions are favorable during the G1 phase, G1 cyclins are degraded causing the cell to prepare to replicate its DNA.