Which one of the following best explains how water moves freely across a plasma membrane?
A) Water moves directly through the phospholipid bilayer because of the charges on phospholipids.
B) Water is brought into the cell by facilitated diffusion but released by exocytosis.
C) It is actively transported across the membrane.
D) Water moves through protein-lined channels in the plasma membrane.
E) The passage of water across a plasma membrane requires facilitated transport.
D
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Which of the following statements best describes our understanding of the role of condensins during cell division?
A. Condensins form rosettes of supercoiled DNA. B. Condensins form solenoid shaped supercoiled DNA. C. Using ATP, condensins form rosettes of supercoiled DNA. D. Using ATP, condensins form solenoid-shaped supercoiled DNA. E. In association with topoisomerase I, condensins stabilize nicked DNA.
Some environmental scientists think that global warming will lead to an even greater increase in the amounts of carbon dioxide in the atmosphere. This would most likely be due to
a. increased use of air conditioners. b. developing nations maturing into developed nations, thereby increasing use of fossil fuels. c. more people driving to cooler regions to escape the heat. d. decreases in the protective ozone layer surrounding the Earth. e. melting of the polar ice caps and thawing of large regions of permafrost.
What are skeletal muscles attached to the bones by?
What will be an ideal response?
Fatty acids are stored in fat droplets in the form of
a. triacylglycerols. b. phospholipids. c. cholesterol. d. glycolipids.