Thr" refers to a gene that governs a cell's ability to synthesize threonine from inorganic precursors. What does the designation "thr+" indicate?
a. that the bacterium is biologically inactive
b. that the bacterium is biologically active
c. that the allele is the mutant allele
d. that the allele is normal (i.e., wild type)
Answer: d. that the allele is normal (i.e., wild type)
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Nuclear magnetic resonance yields the best results when:
A. proteins have Mr > 25,000r. B. two-dimensional NMR is utilized. C. 13C and 15N are incorporated into the protein. D. the number of "restraints" is reduced. E. the pattern is recombined using the Fourier series.
In a monohybrid cross AA × aa, what proportion of heterozygotes is expected among the F2 offspring?
A) 1/4 B) 1/2 C) 3/4 D) All are heterozygotes. E) None are heterozygotes.
Australopiths show a trend toward improved upright walking, smaller teeth, and greater hand dexterity. Like other early hominins, they retained a ____
a. vertically split upper lip b. a skull that opens to the spinal cord at the rear c. modern human sized brain d. chimpanzee-sized brain e. a prehensile tail
Why are chemotherapy and radiation therapy more effective on cancerous cells than normal cells?
What will be an ideal response?