Light microscopy can be used to visualise all of the following except:
a. protozoa
b. viruses
c. fungi
d. bacteria
Ans: b. viruses
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What is the purpose of ethidium bromide in DNA electrophoresis?
A) To tag DNA fragments so they can be viewed under UV light B) To introduce mutations into the DNA C) To fragment the DNA before separating the pieces by size D) To join fragments of DNA together
The basic tool of genetic regulation is the ability of certain proteins to bind to specific
A. regulatory DNA sequences. B. promoter parts of the gene. C. enzymes of the cell. D. repressor parts of the gene. E. regulatory RNA sequences.
The process that merges the gametes from two parents is
A. fertilization. B. meiosis. C. mitosis. D. mutation. E. conjugation.
Peptide hormones generally work by:
A) passing into the cell and attaching to receptors inside. B) triggering an influx of potassium ions. C) attaching to membrane receptors and triggering chemical reactions. D) triggering an action potential in the cell. E) stimulating endocytosis of hormones and receptors.