Analysis of many Drosophila maternal effect genes reveals that many are involved in:
a. female morphogenesis.
b. programmed cell death.
c. forming specific segments in the embryo.
d. nonspecific differentiation.
e. determining the polarity of the embryo.
E
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Within insects, the main evolutionary dividing line is between those that
A. fly and those that do not fly. B. have lost wings that were present in their common ancestor and those that still fly. C. shed their wings as they molt and those that do not. D. undergo metamorphosis and those that don't. E. have eggshells and those that don't.
Mycelia of some mushroom-forming club fungi extend for miles growing underground. Embryonic mushrooms then form on the mycelium. What happens when it rains?
What will be an ideal response?
What is a neuronal attribute that contributes to the resting membrane potential?
a. Potassium is kept at a high concentration outside the cell compared with the inside. b. Sodium is kept at a high concentration inside the cell compared with the outside. c. Neurons are more permeable to sodium than they are to potassium. d. The cytosol contains large molecules that have a net positive charge. e. The cytosol contains large molecules that have a net negative charge.
What is the most common photoreceptor found in nature?
a. chlorophyll b b. chlorophyll a c. rhodopsin d. carotene