A(n) ________ has a higher pH than a(n) ________
Fill in the blank(s) with correct word
base; acid
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A fur color gene in rabbits has a white dominant (W) and brown recessive allele (w). The environment changes suddenly and none of the white rabbits survive. In a population of 10,000 rabbits the initial frequency of W in the pool was 0.7. How many generations would be required to eliminate all W alleles from the population? Assume that there is no mutation and the population meets all other Hardy-Weinberg conditions.
A. 1 B. 2 C. 5 D. 20 E. can never be eliminated
Noller’s conclusions from his experiments on ribosomes
a. were accepted immediately by the scientific community b. showed that the site of peptide bond formation is on rRNAs of the small ribosomal subunit c. indicated that site of peptide bond formation is on proteins of the small ribosomal subunit d. showed that the site of peptide bond formation is on rRNAs of the large ribosomal subunit e. indicated that site of peptide bond formation is on proteins of the large ribosomal subunit
The kelp shown in the accompanying figure represents the ____ stage in its life cycle
a. spore-bearing b. gamete-forming c. haploid d. motile e. feeding
PCR involves a heating step, followed by a cooling step, and then DNA synthesis. What is the primary reason for why this cooling step is necessary?
(a) Cooling the reaction ensures the integrity of the covalent bonds holding the nucleotides together in the DNA strand. (b) Cooling the reaction gives the DNA polymerase an opportunity to rest from the previous cycle so that it will be ready for the next round of synthesis. (c) Transcription takes place during the cooling step. (d) Cooling the reaction brings the temperature down to a level that is compatible with the short primers forming stable hydrogen bonds with the DNA to be amplified.