Pr is located in the __________, and after it absorbs red light, the resulting Pfr moves to the
__________.
a. endoplasmic reticulum; plasma membrane
b. cytoplasm; nucleus
c. plasma membrane; cytoplasm
d. cytoplasm; plasma membrane
e. nucleus; cytoplasm
B
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Based on your knowledge of cost-benefit analysis, why would you expect some white-fronted bee-eaters to fly very far away from their nests to forage when there are food sources nearby?
A) There might be some plentiful food sources further away. B) Competition for food is too intense near the nest. C) Food near the nest is usually of lower quality. D) Predation is highest closest to the nest.
Mammals such as the vampire bat have the ability to generate a urine with a concentration of approximately 3,600 millisomoles (mOsm). If the concentration of their blood is approximately 300 mOsm, their water loss is ______ by producing a concentrated urine.
A. reduced by approximately 11/12 B. reduced by approximately ½ C. actually increased by approximately ½ D. reduced by approximately 5/6 E. not reduced
An organelle found in the nucleus is a
a. plastid. b. vacuole. c. microvillus. d. nucleolus. e. basal body.
Mutations in the selector genes sometimes form structures in the wrong segment, transforming the antenna of a fly into a leg, for example. What are such mutations called?
A) homologous mutations B) lethal mutations C) homeotic mutations D) silent mutations