Which of the following genera fix nitrogen nonsymbiotically?
A. Rhizobium
B. Nitrosomonas
C. Azotobacter
D. Nitrobacter
Answer: C
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The sequence of the messenger RNA molecule (primary transcript) synthesized from a DNA molecule with a coding strand having the sequence 5' ATGCTACCGTTA is:
A. 5' UACGAUGGCAAU. B. 5' UAACGGUAGCAU. C. 5' AUGCUACCGUUA. D. 5' AUUGCCAUCGUA. E. None of the choices given is correct.
All animals gain or lose heat by a combination of four general mechanisms
Indicate whether the statement is true or false.
Inosine is found
A) in aminoacyl-tRNA synthetases. B) in some eukaryotic elongation factors. C) in rRNA. D) in the third position of some codons. E) in the third position of some anticodons.
Why is meiosis important for sexual reproduction?
A. It allows the zygote formed from fertilization to have triple the chromosome number of the organism. B. It allows gametes to have twice the original number of chromosomes of the organism. C. It allows gametes to have half the original number of chromosomes of the organism. D. It allows the zygote formed from fertilization to have half the original number of chromosomes of the organism.