What is the action of the hormone glucagon?
a. stimulates the storage of glucose as glycogen in the liver and skeletal muscles
b. inhibits growth at the end of puberty
c. stimulates the breakdown of glycogen to glucose to raise blood glucose levels
d. inhibits the release of insulin and glycogen when blood sugar levels are uncertain
c. stimulates the breakdown of glycogen to glucose to raise blood glucose levels
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Antibody-mediated immune responses produced by specific proteins are generated by:
a. lymphocytes of the T class. b. lymphocytes of the B class. c. neutrophils. d. basophils.
Which of the following statements describe a reason ribosomal genes are useful for comparing evolutionary relationships among organisms?
A. There are many differences in these genes, even among closely related species. B. All organisms possess these genes and they can be compared with each other. C. These are the only genes that have been sequenced for every organism on Earth. D. Ribosomes of prokaryotes and eukaryotes are identical. E. It is possible to compare the large subunit genes with the small subunit genes.
The outward-facing cell walls of epidermal cells contain which substance to reduce water loss?
a. wax b. pectin c. lignin d. suberin e. chitin
Dominant traits are expressed only in the heterozygous state. Indicate whether the statement is true or false