If a female parent is a carrier, due to the presence of one copy of the recessive Hemophilia A allele being carried on the X chromosome, what are the odds that she could have an affected male child?
a. 0
b. 25%
c. 50%
d. 75%
e. 100%
c
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The name of the enzyme used by Nirenberg and Matthaei to synthesize RNA primers to direct in vitroprotein synthesis using cell extracts is:
A. polynucleotide phosphorylase. B. ribonucleotide synthetase. C. ribonucleotide reductase. D. deoxyribonuclease.
Anticodons pair with
a. codons on DNA b. codons on mRNA. c. codons on tRNA d. codons on rRNA e. messenger RNA and ribosomal RNA.
A squirrel population in an oak forest in Indiana is limited by hawk predators, the amount of acorns produced annually, nesting sites in the trees, and cold winter temperatures. Which of the following is an abiotic factor limiting this squirrel population?
A. the hawks in the region B. the number of acorns produced annually C. the stress of cold winter temperatures D. the number of available nesting sites
Anaerobic bacteria often play important roles in bioremediation. Which of the following is NOT an electron acceptor used by anaerobes during biodegradation reactions?
A) H2O B) CO2 C) SO4-2 D) NO3- E) Fe(III)