In the sodium-potassium pump, sugars and amino acids, or other molecules, are brought through the membrane along with sodium ions through:
A. receptor proteins
B. coupled channels
C. chemiosmosis
D. proton pumps
Answer: B
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One important adaptation of mammals is hair growing out of the skin for retaining heat. How does hair help mammals retain heat?
a. Hair increases the surface area exposed to the sun, capturing more heat from the environment. b. Hair covers the body like a coat, keeping out the cold and stopping evaporative cooling. c. Hair traps a boundary layer of air close to the body, retaining heat generated by metabolic processes. d. Hair’s dark color captures more light, and light is energy, allowing mammals to capture energy to heat the body.
In Figure 43-3, the vestibular canal is labeled:a
1
b. 2
c. 3
d. 7
e. 8
When __________ is uncovered and myosin can bind to it, contraction of a muscle can occur when ATP is utilized.
A. actin B. myosin C. tropomyosin D. troponin
In the chemical equation for burning methane (CH4 + O2 ? CO2 + H2O), CH4 and O2 are the _____ and CO2 and H2O are the _____.
A) molecules; atoms B) reactants; products C) products; reactants D) anions; cations