Which of the following statements would NOT be considered a mechanism of action of hormones?
A. Adjacent cells coordinate cellular activities by exchanging ions and molecules across gap junctions.
B. Increase or decrease the rate of synthesis of a particular enzyme or other protein by changing the rate of transcription or translation.
C. Turn an existing enzyme or membrane channel "on" or "off" by changing its shape or structure.
D. Stimulate the synthesis of an enzyme or a structural protein not already present in the cytoplasm by activating appropriate genes in the cell nucleus.
Ans: A. Adjacent cells coordinate cellular activities by exchanging ions and molecules across gap junctions.
You might also like to view...
Migration, genetic drift, and mutation are like natural selection in that they:
A. result in evolution of a population. B. may alter the allele frequency in a population. C. may alter the genotype frequency in a population. D. are all methods of evolutionary change. E. All of the answer options are correct.
In your 11th year in the field you discover what you think is the common ancestor of the new species of ape and all other gorillas. What types of data would give you the best information on the environment of this ancestral organism?
A. gene sequencing of the new species of ape B. anatomical features of the new species of ape C. behavior of the new species of ape D. fossils of plants and animals found with the fossilized common ancestor E. anatomical features of the fossilized common ancestor
Anticipation is associated with which type of mutation?
A. Nonsense mutations B. Up-promoter mutations C. Intergenic suppressors D. TNRE mutations E. None of the answers are correct
Changes in the nucleotide sequence of DNA, known as _______ are the ultimate source of new alleles.
a. mediocre b. mutagens c. mutations d. metamorphosis e. metastasis