A number of different types of microscopy exist. Each type of microscopy has advantages and disadvantages. Can you identify the microscope that would be most advantageous for the situation below?
a. A cell biologist wishes to visualize the ribosomes of a cell.
b. A bacteriologist wishes to examine the motility of a bacterium.
c. An immunologist wishes to determine if a lymphocyte possesses a certain surface protein.
d. A virologist is trying to determine the three-dimensional shape of a virus.
e. A pathologist is trying to examine the cytoplasm of a cell for changes that result from viral infection.
a. Electron microscopy, preferably transmission electron microscopy, should be used.
b. Phase contrast or differential-interference-contrast would be most helpful.
c. Fluorescence microscopy is often used.
d. Scanning electron microscopy should be used.
e. Transmission electron microscopy will enable the pathologist to visualize the interior.
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A small population isolated at the edge of a species’ geographic distribution may experience ____ and genetic drift,
which may lead to the evolution of distinctive traits by ____.
a. population bottlenecks; artificial selection b. a founder effect; natural selection c. gene flow; natural selection d. natural selection; population bottlenecks e. population bottlenecks; founder effects
The skeletons of both hagfish and sharks are made of the same cartilaginous material
Indicate whether the statement is true or false
When the body experiences stress, the sympathetic division of the autonomic nervous system
stimulates the adrenal medulla to release
a. epinephrine. b. norepinephrine. c. knockout hormones. d. epinephrine and norepinephrine. e. epinephrine, norepinephrine, and knockout hormones.
Potential energy:
a) is energy that changes into chemical energy only with very high temperatures b) transfers motion to matter. c) is contained in matter placed in certain positions or arrangements. d) contains less energy than kinetic energy. e) is kinetic energy that has not yet been turned to heat.