Explain how a pregnancy test works. Make sure to indicate the hormone that the test detects and the role that hormone plays during early pregnancy
What will be an ideal response?
Pregnancy tests detect the hormone human chorionic gonadotropin (HCG) made by the blastocyst (specifically, the chorion). This hormone signals the corpus luteum to continue secreting progesterone, which is necessary for maintaining the endometrium.
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The range of the grizzly bear in the 48 contiguous United States is now less than 1% of what it was in 1800. What has been proposed to help maintain genetic variation in the remaining populations of this species?
A. protected corridors between all of the remaining populations B. regular exchange of bears between isolated populations C. proserving more small patches of forest D. cloning of the most genetically diverse remaining females E. establishment of new parks in Colorado and New Mexico
All populations of all species in a habitat are a
__________. Fill in the blank(s) with the appropriate word(s).
Which of the following statements about root cap is FALSE?
a. It protects the delicate root apical meristem b. It secretes lubricating polysaccharides c. It orients the root that it grows downward d. It loses cells during root growth. e. It absorbs nutrients.
The ideal antimicrobial agent
A) should be soluble in body fluids B) have an unpredictable toxicity C) should have interactions with other drugs or foods D) all of these criteria are met by most antimicrobial agents