A gene mutation
a. is a change in the nucleotide sequence of
DNA.
b. may be harmful.
c. may arise spontaneously.
d. may have no effect.
e. is true of all of these
E
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Why is each element unique with respect to its chemical properties? Each element has a distinctive _____
A) atomic mass B) number of electrons C) number of protons D) number of neutrons E) radioactive property
Which of the following processes best explains the diversity of human รก-tropomyosin proteins?
a. the wobble hypothesis b. exon shuffling c. alternative splicing d. degeneracy
A flock of birds with various beak sizes migrates to a new island where their traditional food is not available
However, there are plants that produce a variety of large nuts, which can be eaten by birds with the largest beaks, and plants that produce a variety of small, soft seeds, which can be eaten by birds with the smallest beaks. Over time, this population divides into two species with large and small beaks. This is an example of A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.
Which of the following is a DNA virus?
A) hepatitis A virus B) hepatitis B virus C) hepatitis C virus D) hepatitis D virus