Plants such as peppermint and sage contain oils. What is the function of these oils?
A. They help keep the plant from drying out.
B. They help repel insects.
C. They keep other plants from germinating nearby.
D. They prevent fungal infection.
E. They have hormone-like activity that helps wounds heal.
B. They help repel insects.
Plant oils evolved to repel insects with their strong odor. They may also be toxic in large quantities.
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An atom with more electrons than protons is called
a(n) __________. Fill in the blank(s) with the appropriate word(s).
Which of the following could be a fat?
A. C2H5OH B. C6H12O6 C. C2H5NO2 D. C51H97O6
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Which hypothesis is supported by the fact that cells of wilting leaves produce abscisic acid, which causes guard cells to close?
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.
The developing embryo of reptiles, birds, and mammals is encased in the fluid-filled ________ membrane.
A. chorionic B. yolk sac C. allantois D. embryonic E. amniotic