A single base substitution mutation is least likely to be deleterious when the base change results in _____
A) a stop codon
B) a codon that specifies the same amino acid as the original codon
C) an amino acid substitution that alters the tertiary structure of the protein
D) an amino acid substitution at the active site of an enzyme
B
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In human females, what does their urine passes through?
A. Clitoris B. Vagina C. Perineum D. Urethra
What prevents mules from having offspring?
A) They don't develop sex organs. B) They are all males. C) They can't produce eggs and sperm. D) Each mule produced is a different species from other mules.
In early cell evolution, why would natural selection favor division into equal-sized daughter cells?
a. Splitting into two equal parts is the most energetically efficient method. b. Two daughter cells is the most efficient way to reproduce sexually. c. Splitting into two daughter cells is more efficient for horizontal gene transfer. d. Hypercycles can be maintained by splitting into two.
Complete hydrolysis of a triglyceride would produce _____.
A) a large assortment of amino acids B) a large assortment of nucleotides C) glycerol and one to three types of fatty acids D) many identical monosaccharides E) a mixture of glycolipids and lipoproteins