Based on what you know about eukaryotic cells, what is one of the arguments against using RNA as the genetic storage molecule?
A. Because RNA uses uracil instead of thymine, it cannot hold genetic information.
B. RNA has a negatively charged sugar phosphate backbone.
C. The structure of RNA does not allow for double-stranded base pairing.
D. There is no current mechanism to package enough RNA to encode all the information needed by the cell.
E. The secondary structure of RNA prevents its replication before cell division.
Answer: D
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Which of the following statements is false?
A. The use of antibiotics causes mutations in bacteria for antibiotic resistance. B. Once evolved, antibiotic resistance can be passed between different species of bacteria. C. Failure to complete a course of antibiotics selects for pathogens that are least susceptible to antibiotics. D. Some diseases, such as tuberculosis, have strains that are so antibiotic resistant that they are essentially untreatable. E. None of the answer options is false.
Each of the following is true about homeoviscous adaptation in membranes except
A) maintains membrane viscosity despite changes in environmental temperature. B) may decrease the average length of membrane lipid fatty acid tails. C) may increase the unsaturation of membrane lipid fatty acid tails. D) occurs primarily in homeothermic (warm-blooded) organisms and only rarely in poikilothermic (cold-blooded) organisms. E) may increase the proportion of cholesterol in animal cell membranes.
Angiotensin II has what effect on systemic arterioles?
A) vasospasm B) vasoconstriction and vasospasm C) vasoconstriction D) vasodilation E) neither vasodilation or vasoconstriction, but may cause vasospasm
When a sudden change in the environment, such as a flood or fire, reduces the size of a population, the survivors' collective gene pool will be only a limited representation of what was present before the disaster. This phenomenon is called:
a) the Hardy-Weinberg effect. b) the genetic load. c) the founder effect. d) the bottleneck effect. e) the mutation effect.