Elongation factors translocate the ribosome in the 3? direction by a distance of __________
A) one codon
B) one nucleotide
C) two nucleotides
D) two codons
E) three codons
A
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What is the purpose of ionic groups in the active sites of enzymes?
a. to alter the substrate in a way that favors catalysis b. to catalyze an acid/base reaction required for synthesis c. to promote the binding of substrates that otherwise would not fit d. to generate an electronic current to provide the energy for the reaction e. to increase the salt concentration required for the chemical reaction to occur
A reaction in which an energy input is required is called a(n) ________ reaction. a. exergonic b. None of these choices
c. kinetic d. endergonic e. hypothermic
Which of the following would be composed of smooth muscle?
A) Ventricles of the heart B) Muscles of the uterus C) Muscles that allow you to cross your eyes D) Quadriceps (leg muscle)
Do active ways of crossing a plasma membrane require an expenditure of chemical energy?
What will be an ideal response?