Which of the following is an example of a behavior adaptation?
a. male turtles wiggling their claws in front of female turtles
b. salt glands in the Albatross
c. the preen gland that produce oil for waterproofing feathers
d. a praying mantis that looks like a leaf
Ans: a. male turtles wiggling their claws in front of female turtles
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In the polymerase chain reaction (PCR) the DNA is first heated to break the hydrogen bonds between the two polynucleotide strands, producing two single-stranded molecules that will serve as templates. Which of the following choices would be the second step in PCR?
1.The mixture is cooled and primers bind to complementary DNA regions. 2.Taq polymerase synthesizes a complementary DNA strand for each single-stranded molecule. 3.The mixture is heated and primers bind to complementary DNA regions. 4.The DNA is cut into fragments with a restriction enzyme. 5.The DNA is stained.
What stimulates spermatogenesis?
A. Estradiol B. FSH C. LH D. Testosterone E. Progesterone
Which of the following types of cells would a flu virus most likely target as the means of entry into the body?
A. epithelial cells lining the respiratory system B. epithelial cells on the skin's surface C. red blood cells that are exposed through breaks in the skin D. osteoclasts within bone cells
Microsporidians are considered parasitic because of the ability to penetrate their host cells using _____
A) a mycelium B) a polar tube C) sporangia D) chitin