What would be the resting potential across an artificial membrane if all charged molecules on both sides were equally permeable?
a. -60 mV
b. +60 mV
c. 0 mV
d. -1 mV
Ans: c. 0 mV
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An endergonic reaction can proceed only if it absorbs:a
randomly available free energy. b. less free energy than is released by a coupled exergonic reaction. c. more free energy than is released by a coupled exergonic reaction. d. less free energy than is released by a coupled endergonic reaction. e. the same amount of free energy that is absorbed by the enzymatic breakdown of proteins.
Which of the following statements is true regarding protein structure determination?
A.) determination of a protein's structure by xray crystallography does not require prior knowledge of its amino acid sequence B.) mass spectrometry is the fastest way to determine the 3D structure of a polypeptide or protein, regardless of its size C.) nuclear magnetic resonance can be used to determine the structure of proteins that are too large to crystallize D.) mass spectrometry can be used to determine the amino acid sequences of a complex mix of different proteins E.) a protein's 3D structure can be reliably predicted from its amino acid sequence by computer algorithms that access the vast quantities of structural information archived in public databases
Nutrients and antibodies move across the placenta from mother to embryo or fetus, as do __________, which can cause birth defects.
Fill in the blank(s) with the appropriate word(s).
To make the skin more flexible and remove wrinkles, ________ could be injected beneath a person's skin.
A. cellulose B. laminin C. proteoglycan D. fibronectin E. collagen