What controls whether an embryo will develop testes or ovaries?:
a. pituitary gland
b. hypothalamus
c. Y chromosome
d. presence or absence of estrogen
Ans: c. Y chromosome
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We expect the fossil record to be incomplete for all of the following reasons EXCEPT:
A. All biomolecules, including lipids and pigment molecules, decay immediately after death. B. Fossilization requires burial in sediment. C. Sediments accumulate irregularly. D. Organisms with hard parts tend to fossilize more readily than soft-bodied organisms. E. Under normal conditions, organisms are broken down by biological and physical processes.
The first sphincter through which food passes is between the ____ and the ____
a. esophagus; stomach b. pharynx; esophagus c. stomach; small intestine d. small intestine; large intestine e. colon; rectum
These white blood cells attack virus-infected cells in the body
A) helper T cells B) cytotoxic T cells C) suppressor T cells D) plasma cells
The bicoid gene is a homeotic gene that encodes a transcription factor.
Answer the following statement true (T) or false (F)