Which two subatomic particles are almost always equal in number?
a. electrons and neutrons
b. protons and neutrons
c. protons and electrons
d. photons and electrons
e. neutrons and neutrinos
C
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If a population's growth rate decreases as the population size approaches carrying capacity, the population's growth follows a(n) ________ model
A) exponential B) boom-and-bust C) logistic D) density-independent
In principle, gene expression can be controlled at any of the steps between a gene and its ultimate functional product. For the majority of genes, however, the __________ is the most important point of control. Because this control point can ensure that no unnecessary intermediates are synthesized.
A) Replication. B) Transcription C) Translation. D) PCR.
Each hemoglobin molecule can carry how many oxygen molecules?
a. 4 b. 6 c. 8 d. 10 e. 12
Paracrine signaling is different from other types of signaling in that the signaling molecule:a
is produced by endocrine glands. b. binds to a receptor. c. is secreted by neurons. d. is transported in the blood. e. acts on nearby cells