Suppose that in studies of genes on the same chromosome you find the following recombination
frequencies:
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Why do the distances between a-c and c-b not add up to the distance between a-b?
a. a and b are not linked
b. the distances were calculated incorrectly
c. b is in between the a and c genes
d. double crossovers between a-b decrease recombinants
e. all three genes encode the same trait
D
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Many environmental factors influence the structure of biological membranes. Which of the following could permanently disrupt phospholipid bilayers in an aqueous solution?
A. the addition of acid to change the pH B. physical agitation of the solution C. slight elevation of the temperature
The activity of the ribosome in translation is
like a(n)
a. assembly line. b. dance. c. planet racing around the sun. d. foot race. e. chess game
The first hormone discovered was
a. insulin. b. gastrin. c. secretin. d. thyroxine. e. estrogen.
Which organism is LEAST likely to survive to reproduce?
A) A plant that has a sweet flavor before it flowers B) A dark-furred rodent that comes out only at night C) A seahorse that mimics the weeds in which it lives D) A flower that produces a scent that attracts bees E) A shrub that produces a toxin in its flower buds that repels deer from eating it