Which of the following DNA mutations is the most likely to be damaging to the protein it specifies?
A. a codon substitution
B. a codon deletion
C. a base-pair deletion
D. a substitution in the last base of a codon
E. a point mutation
Ans: C. a base-pair deletion
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How are the muscle attachments optimized in animals evolved for movement through the soil?
a. The attachments produce levers that move relatively rapidly. b. The attachments produce levers that need to apply large forces for movement. c. The attachments produce levers that move relatively slowly, but need to apply only small forces for movement. d. The attachments produce levers that move rapidly, but need to apply only small forces for movement. e. The attachments produce levers that swing freely.
Rh incompatibility is due to an immune reaction in a pregnant woman to which of the following?
A. a self-antigen on red blood cells B. a foreign antibody on red blood cells C. a foreign antigen on red blood cells D. a self-antibody on red blood cells E. None of the answer choices is correct.
The five-toed limb of stem reptiles became modified
into a limb __________ in vertebrates that followed. a. suitable for high-speed running b. suitable for digging c. suitable for swimming d. with four fingers and an opposable thumb e. with all of these
In genomic imprinting:a
a gene is imprinted in the progeny, depending upon the phenotype of the parent. b. the expression of a gene depends on the parental phenotype. c. a gene is imprinted in the progeny, depending upon the age of the parent. d. the expression of a gene in the progeny depends upon which parent the gene is inherited from. e. only dominant traits are expressed.