An embryo with one X and one Y chromosome will develop male characters because of
a. the presence of female hormones in development.
b. the absence of testosterone during early embryology.
c. the SRY regions of the Y chromosome.
d. maternal substances passed to the zygote during fertilization.
e. human chorionic gonadotropin.
C
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Many bacteria that were originally classified in the genus Streptococcus are now placed into two new genera, Enterococcus and Lactococcus.
Answer the following statement true (T) or false (F)
A fertilized moth egg passes through which stages of
development before becoming an adult? I. larval II. pupal III. reproductive a. I only b. II only c. I and II d. I and III e. II and III
There is a sharp divide between basic and applied research
Indicate whether the statement is true or false
What is active transport?
A) Movement of molecules into or out of a cell down a concentration gradient B) Rapid movement of molecules in a solution C) Movement of molecules into or out of a cell against a concentration gradient D) Movement of molecules into or out of a cell using special proteins and not requiring an expenditure of energy E) Diffusion of molecules within a cell