Which mechanism results in changes in allele frequencies in a population from one generation to another?
a. gene flow
b. mutation
c. genetic drift
d. natural selection
e. disruptive selection
c
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Biodiversity hotspots are defined as areas where biodiversity is both ____ and ____
a. concentrated; endangered b. researched; protected c. low; increasing d. overexploited; studied e. low; declining
Which mineral ion is required for ribozymes to become active and begin self-replication?
a. ferrous iron b. ferric iron c. zinc d. magnesium e. selenium
How does exchange of nutrients, gases, and wastes occur during pregnancy if maternal and fetal blood never mix?
What will be an ideal response?
Cholesterol dissolved in the blood is carried by
a. albumin. b. high-density lipoproteins. c. low-density lipoproteins. d. triglycerides. e. both high-density and low-density lipoproteins.