One of the factors that helps animal-pollinated flowering plants transfer pollen to plants of the same species is that
A) pollinators are able to rapidly extract nectar from any species of flower, regardless of the pollinators' past or recent experience with a given flower type.
B) most pollinators broadly use many different types of flowers.
C) many pollinators have limited learning capacities and are most successful at obtaining food if they continue to visit the same type of flower after learning how to extract its nectar.
D) pollinators only visit flowers that produce massive amounts of pollen.
Answer: C
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A homologous chromosome pair is best described as two chromosomes having
a. the same genes in the same order but possibly having different alleles of those genes. b. the same alleles of the same genes in the same order. c. different genes in the same order and possibly having different alleles of some genes. d. different alleles of the same genes arranged in a different order. e. an identical DNA sequence.
Recognition of self versus non-self is accomplished by ____
a. macrophage function b. complement system activation c. B and T cell cloning d. the presence of MHC markers on cell membranes e. memory cell formation
To inhibit the transcription of operon genes, the lacI gene product binds to
A) the operator. B) the promoter. C) the repressor. D) the inducer. E) ß-galactosidase.
Which of the following is not a form of passive transport?
A) Diffusion B) Osmosis C) Facilitated diffusion D) All of the above are forms of passive transport