Osmosis occurs as water can cross the lipid bilayer through specialized channels for water movement called ________________
A. proteins
B. transmembrane carbohydrates
C. membrane pores
D. aquaporins
D
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Which of the following might explain the variation in this count from year to year?
a. annual weather conditions b. competition c. species diversity d. annual weather conditions and competition
Progression through the various phases of the cell cycle depends on fluctuating concentrations of specific proteins called ________
Fill in the blank(s) with correct word
Which of the following statements concerning DNA is FALSE?
a. The structure of DNA can be described as a double helix. b. DNA is a polymer of nucleotides. c. Purines and pyrimidines are complementary. d. The sugar present in DNA is ribose. e. The two chains of DNA are antiparallel.
Consider several human populations of equal size and net reproductive rate, but different in age structure. The population that is likely to grow the most during the next 30 years is the one with the greatest fraction of people in which age range?
A) 50 to 60 years B) 40 to 50 years C) 30 to 40 years D) 20 to 30 years E) 10 to 20 years