How do adult predaceous diving beetles (Dytisidae) breathe underwater?
a. They carry air bubble under their elytra
b. They have gills
c. They suck air from the surface through an abdominal tube
d. They do not breathe underwater; they hold their breathe
Ans: a. They carry air bubble under their elytra
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The resolving power of a microscope is described as the ability of the microscope to
A. separate clearly two objects that are very close together. B. magnify an object. C. separate the colors of an organism's internal structure. D. see structures at various depths in a tissue.
Polydactyly is considered a Mendelian trait because
A) it is caused by linked genes. B) it is caused by a single gene. C) it is caused due to environmental factors. D) it affects the stem cells.
The part of the eye that focuses light onto a sheet of photoreceptors is the
A. lens. B. cone. C. pupil. D. retina. E. iris.
Which of the following techniques involves hybridizing a cDNA sample to a chip containing thousands of single-stranded DNA sequences, allowing one to study the expression of thousands of genes simultaneously?
A) PCR B) Southern blot C) FISH D) Agarose gel electrophoresis E) DNA microarray