The entrance into the cavity formed during gastrulation in sea stars and frogs is called the

a. archenteron.
b. blastocoel.
c. blastocyst.
d. blastopore.


c

Biology & Microbiology

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ACTH (corticotropin)

a. is secreted by the posterior pituitary. b. has target cells in the autonomic nervous system. c. has target cells in the adrenal glands d. has target cells in the adrenal medulla. e. initiates the autoimmune response.

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Precipitation on a tropical island is greatest during June to August and lowest during January to April. This island must be located south of the equator

Indicate whether the statement is true or false

Biology & Microbiology

Testcrosses are used to determine the genotype of an organism.

a. true b. false

Biology & Microbiology

Eukaryotic chromosomes contain a single DNA replication origin." This statement is

a. true b. false

Biology & Microbiology