Ancestors of the Galàpagos finches had two different types of seeds to eat on some islands. Some seeds were very small, and required small beaks to handle, other seeds were very large and required large strong beaks to crack. This led to among the Galàpagos finches.
A. disruptive selection
B. stabilizing selection
C. directional selection
D. sexual selection
E. artificial selection
A. disruptive selection
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The depolarization phase of an action potential requires _____
A) opening of K+ channels in the membrane B) opening of Na+ channels in the membrane C) opening of Ca2+ channels in the membrane D) a K+ concentration gradient across the membrane E) a Ca2+ concentration gradient across the membrane
The H substance is needed for the proper phenotypic expression of the A, B, and AB blood types in the ABO blood typing system in humans. Individuals who are recessive for the H substance (hh) will have a type O phenotype, even if they have the A and/or B alleles. Two individuals, each with type AB blood and heterozygous at the H locus have children. What is the probability they will have a child who is phenotypically type O?
A. No chance B. 100% C. 3/16 D. 4/16 E. 6/16
Avery, MacLeod, and McCarty's experiments built on the results of the experiments of
A) Gregor Mendel. B) Frederick Griffith. C) Alfred Hershey and Martha Chase. D) Erwin Chargaff and Phoebus Levene.
What kind of bond is formed between the 5? phosphate group of one nucleotide and the 3? hydroxyl (OH) group of the adjacent nucleotide?
A) ionic bond B) phosphodiester bond C) hydrogen bond D) disulfide bond E) hydroxyl bond