There is a population of frogs living in a pond, 25 are green, 25 are brown, 25 are yellow with green spots and 25 are all yellow. A drought occurred and 75% of the frogs died. The remaining frogs were green and brown, after 25 generations the frogs still were green and brown, yellow frogs never appeared in the population again. Which of the following best explains this phenomenon?
A. Sexual selection.
B. Balancing selection.
C. Bottleneck effect.
D. Heterozygote advantage.
E. Founder effect.
C. Bottleneck effect.
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To find the gene that encodes for the blue-light receptor, researchers inserted the gene for the PHOT1 protein into insect cells growing in culture
When they exposed the transgenic cells to blue light, they found that the PHOT1 protein became phosphorylated. No other plant proteins were present in the insect cells. Which of the following is a reasonable conclusion from this result? The PHOT1 protein _____. A) enabled the insect cells to photosynthesize B) phosphorylated itself in the presence of blue light C) is not responsive to blue light D) is photoreversible E) is not functional in insect cells
_____ trigger immune responses
a. Cytokines d. Antigens b. Lysozymes e. Histamines c. Immunoglobulins f. all of these
What are mobile genetic elements, and how do they affect host organisms?
What will be an ideal response?
Which of the following is an exploited product of lactate fermentation?
a. butter b. beer c. yogurt d. ice cream e. loaf of breadDuring fermentation, the immediate fate of the electrons in NADH is that they:a. are transferred to the electron transport chain. b. are transferred to an organic molecule. c. are transferred to O2. d. are used to make CO2. e. are used to form H2O.