In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?
A) The growth factor is a paracrine signal.
B) The growth factor depends on osmosis.
C) The mammal only carries growth factor through the lymph.
D) The growth factor is an exocrine signal.
E) The growth factor is an endocrine signal.
Ans: A) The growth factor is a paracrine signal.
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In a dihybrid cross, in which both parents are heterozygous for both traits, what is the probability that the offspring will exhibit both of the dominant phenotypes?
A. 1/16. B. 1. C. 6/16. D. 3/16. E. 9/16.
Yeasts
A. reproduce asexually by budding. B. are members of Ascomycota. C. are responsible for beer, wine, and bread production. D. All of the choices are correct.
The legless condition that is observed in several groups of extant reptiles is the result of _____
A) their common ancestor having been legless B) a shared adaptation to an arboreal (living in trees) lifestyle C) several instances of the legless condition arising independently of each other D) individual lizards adapting to a fossorial (living in burrows) lifestyle during their lifetimes
You are working with a strain of E. coli that has a mutation in the DNA polymerase II gene, such that the encoded protein is exonuclease deficient, but is otherwise normal. How do you predict that this would most likely affect the activity of this enzyme?
A. This mutation would prevent the ability of DNA polymerase II to remove RNA nucleotides in the 5' to 3' direction. B. This mutation would prevent the ability of DNA polymerase II to engage in lagging strand synthesis. C. This mutation would prevent the ability of DNA polymerase II to form phosphodiester bonds between nucleotides. D. This mutation would prevent the ability of DNA polymerase II to remove DNA nucleotides that are damaged.