Heating inactivates enzymes by
A) breaking the covalent bonds that hold the molecule together.
B) removing phosphate groups from the enzyme.
C) causing enzyme molecules to stick together.
D) changing the enzyme's three-dimensional shape.
Answer: D
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The common species name of the virus is based on the
A. presence or absence of a nuclear membrane. B. type of nucleic acid it contains. C. disease the virus causes. D. geographic area it is found.
All of the following methods are employed to identify pathogens in clinical specimens EXCEPT
A. biochemical tests. B. special stains and microscopy. C. culture on a variety of all-purpose, selective, and/or differential media. D. molecular testing for nucleic acids. E. immunoassays. F. There are no exceptions here. All of these methods are used to identify pathogens.
Vascular cambium gives rise to which of the following tissues?
a. primary phloem b. periderm c. epidermis d. secondary xylem e. cork cambium
Compound leaves are defined as being divided into
A. blades. B. companion cells. C. leaflets. D. stomata. E. lateral meristems.