Which of the following components of an amino acid differs from one amino acid to another?
A. the -carbon
B. the carboxyl group
C. the side chain
D. the amino group
E. the hydrogen opposite the R-group
Answer: C
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The promoters of positively controlled operons require activator proteins, because
A) RNA polymerase easily recognizes the consensus sequence. B) they are required to inactivate the repressor proteins. C) the promoters have nucleotide sequences that bind RNA polymerase weakly, which are not close matches to the consensus sequence. D) they are needed to bind to the allosteric site of RNA polymerase.
Allergy testing, which is accomplished by injecting tiny amounts of allergen into the skin and examining the injection site for a reaction, is an example of an in vitro test.
a. true b. false
The cell theory states that the cell is the basic unit of structure for all organisms. What smaller structure would make up the cells of all organisms?
A) cell wall B) chloroplast C) nucleus D) cell membrane
A common GTP-binding messenger that links the receipt of an extracellular signal to the production of an intracellular one is _____.
-G protein -actin -ethylene -cadherin