What major concept of DNA did Watson and Crick design in their DNA model?
(A) DNA was a double helix
(B) DNA was the hereditary molecule
(C) DNA copies itself through semiconservative replication
(D) Amino acid may have been the first biological molecules formed on earth
Answer: (A) DNA was a double helix
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Which process could be compared to how rushing steam turns a water wheel?
A) the citric acid cycle B) ATP synthase activity C) formation of NADH in glycolysis D) oxidative phosphorylation E) the electron transport system
Which of the following statements concerning plasma cells is FALSE?
A) They live for many years and function as memory cells. B) They are descended from activated B cells. C) They can produce large quantities of antibodies on a daily basis. D) They secrete a single type of antibody molecule specific for a single epitope. E) The antibodies they produce can remain in circulation for weeks.
Change in chromosome structure in which a segment of a chromosome is turned around 180°; this reversed sequence of genes can lead to altered gene activity and abnormalities.
What will be an ideal response?
A virus was used to alter human cells. mRNA for a gene was inserted into the virus, and the virus infected the human cells and inserted the gene into the genome of the cell. What type of virus could do this?
a. the T4 bacteriophage b. a temperate phage c. a retrovirus d. all of the above