Four of the five choices listed below are types of
prezygotic isolating mechanisms. Select the
exception.
a. temporal
b. hybrid inviability
c. mechanical
d. ecological
e. gamete
Answer: b
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Alpha helices are stabilized by hydrogen bonds between amino acids that are ______ residues apart
A. 2 B. 4 C. 10 D. 20 E. 100
RNA serves to convert the information stored in DNA to ________.
A. carbohydrates B. lipids C. RNA D. protein
Mast cells ____
a. circulate in the bloodstream b. degranulate in response to signaling molecules secreted by endocrine and nerve cells c. respond to normal flora d. release signaling molecules that cause arterioles to constrict e. engulf and digest pathogens
If a pathogen penetrates nonspecific physical and chemical surface barriers, it breaks through the ________
A) first line of defense B) first and second lines of defense C) second line of defense D) third line of defense