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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Over the past 600 million years, the overall trend in the number of species has been ________

Fill in the blank(s) with correct word

Biology & Microbiology

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

Biology & Microbiology