Typical ratios resulting from epistatic interactions in dihybrid crosses would be ________
A) 3:1, 1:1
B) 9:3:3:1, 1:2:1
C) 1:2:2:4:1:2:1:2:1, 1:2:1
D) 1:1:1:1, 1:4:6:4:1
E) 9:3:4, 9:7
E
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When the death of species is less eminent, but the population of a particular species is quite small, it is
defined as being:a. extinct. b. extant. c. endangered. d. threatened. e. endemic.
mRNA surveillance mechanisms are necessary ________
A) to measure the concentration of mRNAs in the cytoplasm B) for polyadenylation at the 3' end of mRNA C) in determining which alternative splice site should be used D) to recruit general transcription factors to the promoter E) to eliminate mRNAs with a premature stop codon
In the human genetic disease sickle cell anemia, a single change in the genetic sequence of the hemoglobin-beta gene results in the amino acid valine being substituted for the amino acid glutamic acid in the beta chain of the hemoglobin protein. Which
level(s) of the protein structure will be affected? A) primary structure B) secondary structure C) tertiary structure D) quaternary structure E) primary, secondary, tertiary, and quaternary structures
Organic molecules consisting of only hydrogen and carbon are called:
A) carbohydrates. B) hydroxyls. C) hydrocarbons. D) fats. E) carbonic hydrides