Which of the following choices is an example of a positive feedback mechanism?
a. ceasing exercise when tired
b. sweating when hot
c. contractions in childbirth increasing production of oxytocin
d. eating when hungry and stopping when full
c
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The source of new alleles in a population is
a. natural selection. b. mutation. c. microevolution. d. adaptation. e. genetic drift.
Which of the following terms means the study and comparison of proteins within and among organisms?
A.) genetic engineering B.) proteomics C.) genomics D.) bioinformatics
Choose the key characteristic that allowed amphibians to successfully invade land.
A. partially divided heart B. legs C. cutaneous respiration D. All of these are correct.
Peptide hormones ______.
a. are hydrophilic b. cannot enter the target cell c. bind to a receptor on the cell surface d. all of these