Which tRNA anticodon sequence is the correct match to the mRNA codon listed below? Note: codon-anticodon base-pairing is antiparallel. 5'-CGA-3'
A) 3'-CGA-5'
B) 3'-TCG-5'
C) 3'-GCT-5'
D) 3'-GCU-5'
Ans: D) 3'-GCU-5'
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The important solvent associated with living things is ________.
A. sodium chloride B. benzene C. water D. ethyl alcohol E. carbon dioxide
Which of the following statements is not true about natural selection?
a. Offspring of individuals that are better adapted will make up a larger proportion of the next generation. b. Natural selection directs evolution by preserving traits acquired during an individual's lifetime. c. Natural selection depends on the genetic variability in a population, which arises through mutations. d. Natural selection acts to preserve favorable traits and eliminate unfavorable traits. e. Natural selection leads to adaptive evolutionary change.
Which of the following are accurate descriptions of the properties of water? (select all that apply)
A. Water molecules are polar, and thus dissolve other polar or ionic substances. B. Water molecules are nonadhesive, tending to repel each other forcefully, resulting in a low surface tension. Water molecules are nonadhesive, tending to repel each other forcefully, resulting in a low surface tension. C. Water shrinks when it crystallizes, and ice is more dense than liquid water. D. Water's high heat of vaporization makes evaporation an effective way for many organisms to shed excess heat.
With a light microscope, which of the following would allow discrimination between eukaryotes and prokaryotes?
a. Observation of photosynthetic pigment b. Observation of flagella c. Observation of the plasma membrane d. Observation of nuclei d. Observation of the ribosomes