Which of the following is the final stage of the
prenatal period?
a. zygote.
b. blastocyst.
c. embryo.
d. fetus.
e. infant.
D
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An animal virus contains protein, lipid, and DNA. Shown here is the absorption spectra of the three macromolecules purified from the virus. Which of the three samples, A, B, or C, contains DNA?
A. Sample A contains DNA. B. Sample B contains DNA. C. Sample C contains DNA.
Fairy shrimp that are found in deserts tend to have very drought-resistant eggs that can remain
dormant for many months. Which of the following disturbances might have a positive effect on seasonal reproduction in fairy shrimp?
a. fire b. drought c. flooding d. introduction of an invasive predatory fish
____________________ is the recommended ART procedure performed on women with blocked oviducts. Fill in the blank(s) with the appropriate word(s)
If an organism has two non-identical versions of a gene, the one that is not expressed in the organism is called the __________
Fill in the blank(s) with the appropriate word(s)