If pregnancy does not occur, what hormone will decrease in concentration?
A. FSH
B. chorionic gonadotropin
C. LH
D. progesterone
Answer: D
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Which of the following is a major limiting factor that affects how many steps are in a food chain?
a. food b. habitat c. predators d. energy
DNA methylation and histone acetylation are considered two ________ processes
Fill in the blank(s) with correct word
What are opsins and what are they a part of?
a. membrane lipids that form a complex with a retinal molecule at the centre b. membrane proteins that form a complex with a retinal molecule at the centre c. retinal molecules that form a complex with membrane proteins at the centre d. retinal molecules that form a complex with membrane lipids at the centre
Which of the following is not a function of an antibody?
A) stimulate helper T cells B) neutralize toxins C) attract phagocytes D) activate complement cascade