Organisms that thrive in extremely cold climates often produce proteins that act as "antifreeze". Given that all proteins bind to other molecules, how might such antifreeze proteins work?
A.) they bind to channels in the cell membrane, preventing water from seeping into or leaking out of cells
B.) they bind to metal ions and each other, which attracts water molecules to form a thick gem that expands
C.) they bind to proteins in the cell nucleus, promoting the expression of antifreeze genes
D.) they bind by way of their beta sheets to tiny ice crystals, preventing their growth
Ans: D.) they bind by way of their beta sheets to tiny ice crystals, preventing their growth
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When FasL is bound by the Fas receptor
a. apoptosis is initiated b. the cell is killed by the Fas receptor c. cytotoxic T cells are protected d. apoptosis is initiated and the cell is killed by the Fas receptor e. apoptosis is initiated, the cell is killed by the Fas receptor and cytotoxic T cells are protected
Which of the following BEST defines a sensory receptor?
a. an organ, such as the human eye b. endings of sensory neurons c. highly branched endings of axons d. any form of energy e. an action potential
Which of the following is NOT a monophyletic group?
A) Turtles and lizards B) You, your parents, and your siblings C) The family Semionotidae, which includes fish that may not share a common ancestor D) The class Mammalia, which includes all mammals E) The kingdom Animalia, which includes all animals
Which of the following does not have an environmental factor that affects the distribution of the phenotype?
a. phenylketonuria b. skin color c. height d. Marfan syndrome