If a base sequence in DNA reads GCA, what will be the corresponding codon in the mRNA?
A) GCU B) CGT C) GCT D) ACG E) CGU
Answer: E
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A wheat farmer is concerned that his land has been depleted of nitrogen. What steps can he take to make sure his wheat crops have enough nitrogen for the next season? Select all correct choices
A. He can plant alfalfa on his land and let it serve as "green manure." B. He can treat his land with man-made fertilizers, thanks to Haber and Bosch. C. He can continue to plant his wheat crops, as wheat can form root nodules. D. He can treat his land with phosphate fertilizers.
The enormous genetic diversity of HIV has made it especially difficult to create a vaccine against the virus. We can attribute this genetic diversity to
A. mutation hotspots in the hemagglutinin (H) molecule. B. mutation hotspots in the CD4+ molecule. C. the high error rate of reverse transcriptase. D. the high sensitivity of the virus to UV radiation. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about HIV infection? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What has identical molecular formulas but different structures and characteristics?
A. Isomers. B. Stereoisomers. C. Enantiomers. D. Isotopes. E. Isomers, sterioisomers, and enantiomers.
Figure 40.5A
The letter "B" in the above figure represents a(n) _____.
A. kidney B. urethra C. urinary bladder D. ureter E. Bowman's capsule