The hydrogen bond between two water molecules forms because water is
A) hydrophobic.
B) nonpolar.
C) a large molecule.
D) a small molecule.
E) polar.
E
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Which of these is rich in unsaturated fats?
A. a fat that is solid at room temperature B. butter C. beef fat D. bacon grease E. olive oil
What happens next after insulin binds to a G-protein coupled receptor (GPCR)?
A. The G-protein loses GDP and gains GTP becoming activated. B. The G-protein loses GTP and gains GDP becoming inactivated. C. The G-protein loses GDP and gains GTP becoming inactivated. D. The insulin enters the cell through the GPCR and diffuses to the nucleus where it interacts with transcription factors. E. The G-protein loses GTP and gains GDP becoming activated.
Which of the following could be an agent of natural selection?
A. accidental death of cows by lightning strikes B. insects that are eaten after they have reproduced C. characteristics of female animals that cause males to avoid them D. increases in the population size
A hypothesis currently getting a lot of attention concerning the origin of biological molecules is that they originated ____.
A. in hot springs B. under ice sheets in Antarctica C. near hydrothermal oceanic vents D. in salt lakes E. in tidal pools