Formalin (37% formaldehyde) is used for
A) antisepsis.
B) disinfection.
C) sterilization.
D) sanitization.
E) both disinfection and sterilization.
E
Bloom's Taxonomy: Comprehension
Section: Chemical Methods of Microbial Control
Learning Outcome: 9.26
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Which of the following occurs in E. coli when lactose is absent from its environment?
A. Large amounts of ?-galactosidase, lactose permease, and galactoside transacetylase are made. B. Trace amounts of ?-galactosidase, lactose permease, and galactoside transacetylase are made. C. No ?-galactosidase, lactose permease, and galactoside transacetylase is made. D. The lac operon is induced. E. Polycistronic mRNA levels would be very high.
Which of the following is not true of the enzyme-substrate interaction?
A) Many enzymes are extremely specific regarding a substrate. B) Many enzymes cannot recognize a stereoisomer of their substrate. C) Some enzymes accept any of a whole group of substrates. D) Carboxypeptidase recognizes any of the amino acids from the carboxyl end of a polypeptide. E) Cells are often able to carry out metabolic activity with only a handful of enzymes.
RNAi could be used to treat macular degeneration by
a. preventing the development of excess blood vessels. b. increasing the turnover rate of blood vessels in the retina. c. preventing the replication of the virus that causes macular degeneration. d. blocking expression of the viral genes that allow infection of retinal cells to occur. e. stimulating the capillaries to tighten their walls, preventing the plasma leakage that clouds vision.
What is the name of the specialized leaves on which club moss sporangia form, and which occur near stem tips?
a. sporophylls b. cladophylls c. antheridia d. archegonia