Which extraembryonic membrane produces HCG?

a. yolk sac
b. amnion
c. chorion
d. allantois
e. umbilical cord


ANSWER: c

Biology & Microbiology

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For hormones that homeostatically regulate cellular functions, _____

A) negative feedback typically regulates hormone secretion B) the circulating level of a hormone is held constant through a series of positive feedback loops C) both lipid-soluble hormones and water-soluble hormones bind to intracellular protein receptors D) endocrine organs release their contents into the bloodstream via specialized ducts E) it is impossible to also have neural regulation of that system

Biology & Microbiology

What type of microscope uses magnetic lenses to bend beams of electrons?

a. compound microscope b. confocal microscope c. scanning electron microscope d. transmission electron microscope e. light microscope

Biology & Microbiology

In the benthic zone of lakes and ponds, organisms that are attached to or move on a submerged substrate but do not penetrate it are referred to as ________

Fill in the blank(s) with correct word

Biology & Microbiology

A heterozygous organism

A) always shows a recessive trait. B) can't produce gametes. C) has two identical alleles of a gene. D) has two different alleles of a gene.

Biology & Microbiology