To say that an enzyme has been denatured means that
A) the enzyme is working at an optimal temperature.
B) an inhibitor has bound the enzyme at the active site.
C) the enzyme is working at its maximal rate.
D) its three-dimensional structure has changed and the enzyme can no longer function properly.
D
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What ensures that the correct amino acid is added during translation?
A) the anticodon of a properly formed aminoacyl tRNA B) the methyl-guanosine cap of a properly modified mRNA C) the poly-A tail of a properly modified mRNA D) the twisting number of a properly supercoiled DNA
Bacteria and Archaea are general single-celled organisms, but some phyla form sheaths around multiple cells to facilitate attachment and filament formation
Indicate whether the statement is true or false.
The polymerase chain reaction (PCR) is a technique used to produce many copies of a specific DNA sequence
a. True b. False
In all plants, gametes unite at fertilization to form a ____
a. spore b. gametophyte c. sporophyte d. zygote e. seed