Which of the following is an example of a positive feedback mechanism?
a. increase in body temperature when exposed to cold
b. increased muscle contractions during labor
c. decreased insulin production in response to low blood sugar
d. increased respiration rate in response to decreased blood pH
e. Both choices A and B are correct.
B
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Which of the following does not provide molecular evidence for evolution?
A) The 1,000-fold differences in nonsynonymous substitutions between some genes B) The existence of pseudogenes C) The fact that high-expression genes use amino acids that are less energetically costly than those used by low-expression genes D) The fact that there is a lower rate of nucleotide substitutions in coding regions than in noncoding regions of genes E) All these are molecular evidence for evolution
The cell wall is composed primarily of cellulose. What is the cellulose composed of?
a. carbohydrates b. proteins c. phospholipids d. steroids
In a cross between two tall plants with yellow seeds that are heterozygous on both traits (TtYy), suppose Mendel discovered that a small number of offspring (5-6%) from these parents were short and green (ttyy). What does this say about the T and Y genes?
a. One is dominant over the other. b. They sort independently of each other. c. They are pleiotropic. d. They produce polygenic effects. e. They are codominant alleles of each other.
Competition among individual members of the same species is referred to as ________ competition
Fill in the blank(s) with correct word