A genetic abnormality such as down syndrome can be diagnosed by using the cells obtained during amniocentesis to create a
A. karyotype
B. therapeutic gene
C. DNA fingerprint
D. recombinant vector
Answer: A. karyotype
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Polymerase chain reaction (PCR) has advanced an understanding of systematics because it allows
a. for analysis of morphological traits. b. for analysis of small amounts of DNA from dried museum specimens and some fossils. c. for the reconstruction of entire individuals from a small amount of DNA. d. for the reconstruction of entire individuals from a small amount of RNA. e. for the analysis of an entire genome from a small fragment of the genome.
Fibrous joints
What will be an ideal response?
Mutations in the gene for troponin can result in the production of the troponin protein, which has varying affinities for Ca2+ ions. Suppose that in a muscle cell a mutant troponin is expressed that has such a high affinity for Ca2+ ions that once they
bind to troponin they cannot unbind. What will likely happen in this muscle cell? A) Myosin heads will not bind to actin after action potentials stop being received. B) Myosin heads will bind to actin after action potentials stop being received. C) Tropomyosin will not move to expose myosin binding sites. D) Cross-bridges will form between myosin and tropomyosin.
What two hormones are involved in regulating the blood calcium level?
A. PTH and calcitonin B. renin and PTH C. calcitonin and renin D. aldosterone and PTH E. renin and aldosterone