Why is Chorionic villus sampling preferred over amniocentesis in some geographic regions?
a. Because it samples amniotic fluid and allows for a more accurate assay.
b. Because the test is conducted earlier in the pregnancy, performed at 10-12 weeks.
c. It is ofter conducted later in the pregnancy, at 15-20 weeks.
d. Some workers report a lower success rate of correct karyotyping.
Answer: b. Because the test is conducted earlier in the pregnancy, performed at 10-12 weeks.
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Basic dyes
A. have negative charges. B. have positive charges. C. are electrically neutral. D. contain both positively and negatively charged particles.
Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?
A. by proposing that humans, bats, and dolphins share a common ancestor B. by the principle of convergent evolution C. by identifying the bones as being homologous structures D. Three of the statements above are correct. E. Two of the statements above are correct.
The multidrug resistant pumps in many bacterial cell membranes function by
A. synthesis of enzymes that alter drug structure. B. removing the drug from the cell when it enters. C. bacterial chromosomal mutations.
The case of the giant panda with a false thumb, and the red panda that lacks a false thumb was resolved by using
A. sequencing of mtDNA. B. sequencing of rDNA. C. DNA-DNA hybridization. D. sequencing of amino acids. E. immuno-rejection of antibodies.