Which of the following statements concerning nucleic acids is CORRECT?
A) Nucleic acid strands are held together by hydrogen bonds between adjacent carbohydrates.
B) Cellular DNA is double stranded.
C) All viruses have DNA genomes.
D) The nucleic acid polymer is composed of peptide bonds.
E) There are three naturally occurring purines in nucleic acids.
B
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Metastatic cancer cells:
A. are able to leave the tumor where they originated and travel to distant locations to set up new tumors at distant sites. B. have lost their adhesion to the extracellular matrix, freeing them from being confined to the original tumor. C. become malignant when they cross the capillary basal lamina. D. only need to cross a single layer of capillary endothelial cells to form tumors at distant sites. E. All of these choices are correct.
When direct examination of virioplankton is carried out by transmission electron microscopy, the numbers obtained are reported as ________.
A. particulate organic matter B. viral potential C. plaque-forming units D. virus-like particles
In the biological species concept, it is specified that two organisms are of the same species if they
breed and
a. are unsuccessful in producing offspring. b. produce any offspring. c. produce fertile offspring under laboratory conditions only. d. produce fertile offspring under normal circumstances. e. produce infertile offspring.
When DNA fragments are inserted into plasmids, the resulting recombinant molecules must be introduced into ____ in
order for the DNA to be replicated.
a. rabbits b. humans c. bacteria d. mice e. chimpanzees