Luke sprained his ankle, tearing some of the collagen protein that forms his ligaments. Some types of collagen consist of three polypeptide chains twisted together to form a rope-like strand. What level of protein structure does this rope-like strand represent?
A. primary
B. secondary
C. tertiary
D. quaternary
Answer: D
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It took 3 million years for the human population to reach 1 billion, 123 years to grow to 2 billion, and
12 years to grow from 6 to 7 billion.
Indicate whether the statement is true or false.Four of the five answers listed below are sources of variation in a population. Select the exception
a. mutation b. sexual reproduction c. crossing over d. independent assortment e. law of dominance
Which principle of heat exchange is the most important explanation for why birds look larger in colder weather because they fluff their feathers?
A) Fluffing feathers results in less cooling by radiation because feathers emit less infrared radiation than other tissues do. B) Fluffing decreases the amount of heat lost by conduction when the bird makes contact with cold objects in its environment. C) Fluffing creates a pocket of air near the bird that acts as insulation. D) Fluffing decreases the surface-area-to-volume ratio, thus decreasing the amount of heat lost to the environment.
Which of the following tests will not differentiate between species of staphylococci?
A) Beta hemolysis B) Mannitol fermentation C) Coagulation of plasma D) Gram stain E) Reaction to novobiocin