Amoebic dysentery is most commonly contracted through
A. contaminated blood products.
B. direct transmission from one host to another.
C. insect bites.
D. puncture wounds.
E. the fecal-oral route from contaminated food or water.
Answer: E
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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.
Blood from the systemic circuit is first received by the heart in the
a. coronary vein. b. left atrium. c. right ventricle. d. right atrium. e. left ventricle.
The external genitalia of a woman refer to the reproductive structures that lie outside the opening to the vagina. They are also known as the ________
Fill in the blank(s) with correct word
Which molecule is secreted from the peritubular capillary network into the convoluted tubules?
A. salt B. plasma proteins C. H+ D. nutrients E. water