The trophoblast secretes ______ that signals the corpus luteum that pregnancy has begun
a. estrogen.
b. a gray crescent.
c. progesterone.
d. hCG.
e. an enzyme
D
You might also like to view...
A new gene is discovered that dramatically aids in the digestion of fish. You hypothesize that populations with a history of being near the shoreline would have more copies of this gene than populations found farther inland
What technique would you use to test this? A. RFLP analysis B. CNV C. genotyping microarray D. gel electrophoresis E. VNTR analysis
According to the endosymbiosis theory, how many membranes should a mitochondrion have?
A. Zero B. Two C. One D. Three
The purpose of the scientific method is to
A. help scientists avoid making faulty assumptions and false claims. B. win a Nobel Prize. C. control nature. D. prove the existence of God.
The molecules rhodopsin and retinal are involved in the sensory system that detects
A. sight. B. hot and cold. C. smell. D. hearing. E. balance.