Chemical signals that are released by one cell and act locally on neighboring cells are referred to as:
A. paracrine signals.
B. autocrine signals.
C. hormones.
D. pheromones.
E. neurotransmitters.
A
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The amount of solar energy that any spot on the
surface of the earth receives is affected by a. the particulate matter and pollution in the air b. the angle at which the sun strikes the earth. c. the amount of atmosphere above the spot. d. all of these e. none of these.
Currently, much commercial lumber and wood products come from which biome?
a. tundra b. temperate rain forest c. savanna d. tropical rain forest e. temperate deciduous forest
An antigen-bearing pathogen that breaches normal flora surface barriers first triggers __________ immunity.
Fill in the blank(s) with the appropriate word(s).
Where is the general location of a Barr body?
A) stuck in a nuclear pore B) adjacent to the Y chromosome C) attached to the other X chromosome D) attached to the nuclear envelope E) in the nucleolus