Some enzymatic receptors and most G protein-coupled receptors transmit the signal into the cytoplasm by utilizing other substances within the cytoplasm that are referred to as:
A. second messengers.
B. first messengers.
C. intracellular receptors.
D. genes.
Answer: A
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Moist heat kills microorganisms by
A. irreversible denaturation of proteins. B. destruction of carbohydrates in the cell wall. C. denaturation of nucleic acids. D. dissolving the capsule.
Which of the following is studied by a population geneticist?
a. How selective forces change the allele frequencies in a population over time b. How genetic traits and ecosystems affect the migration patterns of populations c. How embryological development impacts the expansion of a population d. How evolution causes the development of multiple species within a population
Over the past 600 million years, the overall trend in the number of species has been ________
Fill in the blank(s) with correct word
If a population was in Hardy-Weinberg equilibrium then ________ would occur in that population.
A. an increase of recessive alleles B. directional selection C. assortive mating D. no evolutionary changes E. natural selection