What happens when the concentrations of a solute that can freely diffuse across a membrane are equal inside and
outside the cell?
a. The osmotic pressure is equilibrated on both sides of the membrane.
b. Solute molecules no longer diffuse across the membrane.
c. Solute molecules continue to diffuse across the membrane.
d. Transporter proteins are inhibited to prevent movement across the membrane.
e. Channel proteins are gated to prevent movement across the membrane.
ANSWER: c
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. Which of the following is one of the four major biological macromolecule classes?
a. proteases b. hydrophilic G-proteins c. nucleic acids d. amorphous solids
If a red blood cell, or any other type of human cell, is placed in a hypertonic solution, water enters the cell, causing it to swell and eventually burst
Indicate whether the statement is true or false
Pickling is an effective means of food preservation involving
A) increasing oxygen content. B) increasing salt concentration. C) reducing pH. D) reducing oxygen content. E) increasing salt concentration or reducing pH or both.
A friend of yours is wondering about the differences between the words "orientation" and "navigation" when these two terms are used in descriptions of bird migrations. Since you have studied and know something about animal behavior, what do you tell your friend?
A. Orientation is following a bearing, while navigation is setting or adjusting a bearing. B. Orientation and navigation are used interchangeably when referring to avian migrations. C. Orientation is the ability to find true east, navigation is the ability to find a bearing while crossing water. D. Orientation is adjusting a bearing, while navigation is actually following a bearing. E. Orientation is following the sun in the day as starling do, while navigation is following a bearing with a small amount of magnetite, which is found in the heads of some migratory birds.