Lipopolysaccharides are correctly described as
I. Found in both Gram(-) and Gram(+) bacteria
II. Contains lipid A as part of its structure
III. Infection of which are treated by antitoxin
A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III
Ans: B. II only
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You have discovered a new species of prokaryote in a deep sea thermal vent. Without any further characterization, which one of the following statements could you make about this species with a high degree of certainty?
A. These organisms store their genetic information in a compartment called a nucleus. B. Information in DNA is translated into RNA and then transcribed into protein. C. The organisms are from the domain Archaea. D. Information in RNA is transcribed into DNA and then translated into protein. E. None of the above statements can be made with certainty.
Collagens are associated with which of the following types of cellular junctions?
A) gap junctions B) tight junctions C) plasmodesmata D) adhesive junctions E) none of the above
The photoreceptor for photoperiodism and some other light-initiated plant responses is a group of blue-green pigmentsnamed:a
xanthophyll. b. carotene. c. chlorophyll. d. phytochrome. e. phycocyanin.
Which part of the genome is affected by cancer-causing alterations to cellular DNA?
a) Introns. b) Oncogenes. c) Exons. d) Promoters.