Enzymes _____
a. are proteins, except for a few RNAs
b. lower the activiation energy of a reaction
c. are changed by the reactions they catalyze
d. are proteins, except for a few RNAs and lower the activation energy of a reaction
D
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________ is the turnover number for a given enzyme.
Fill in the blank(s) with the appropriate word(s).
An organ is defined as ____
a. one or more cell types that perform specific functions b. a tissue that is unique is its function c. various tissues that perform different functions d. two or more tissues organized and capable of carrying out a specific task e. two or more tissues co-localized to one part of the body
Eukaryotic and prokaryotic organisms differ in how they process genetic information. Which statements best explain one of these differences?
A. In prokaryotes, genes are transcribed directly into polypeptides. In eukaryotes, genes are transcribed into RNA which is used to assemble polypeptides. B. In prokaryotes, translation occurs before genes are transcribed into mRNA. In eukaryotes, genes are transcribed into mRNA which is then translated into polypeptides. C. In prokaryotes, translation of the mRNA begins before transcription is complete. In eukaryotes, transcription and modification of the mRNA is completed before translation begins. D. In prokaryotes, introns are removed before genes are transcribed into mRNA. In eukaryotes, introns are removed after genes are transcribed into mRNA.
A child is born with dwarfism (tt). His parents are of normal height. Which of the following must be TRUE of the parents?
A) They are both homozygous dominant tall. B) They are both heterozygous dwarf. C) They are both homozygous recessive dwarf. D) They are both heterozygous tall.