What is the name of the model of maximum rate of population growth?
A) Logistic
B) Speculative
C) Factorial
D) Exponential
D
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Aquaporins are proteins that control the passage of water molecules across a cell membrane. The protein forms a pore, or opening, in the membrane. You isolate what you think are two different molecules of aquaporin
, and determine that one of the proteins has a larger pore diameter than the second. Which of the following do you conclude? A) These two forms of aquaporin will have identical sequences of amino acids. B) These two forms of aquaporin will have different sequences of amino acids. C) You will have to sequence the proteins to compare their primary structure, because it should have no effect on pore diameter. D) These two forms of aquaporin have identical primary structure but differ in their tertiary structure.
Which of the following things are made (in part) of carbon? Select all that apply
A. the shells of clams and other mollusks B. the glucose/sugars in fruits C. limestone at the bottom of the sea D. certain gases in the atmosphere
Biological diversity is composed of what three levels?
A. genetic; species; and ecosystem diversity B. genetic; function; and process diversity C. ecosystem; species; and process diversity D. trophic; ecosystem; and species diversity
Which of the following features would have helped early plant ancestors evolve to a terrestrial existence?
A. apical cells B. plasmodesmata C. a cuticle D. placenta E. All of these features would have helped.