Electron microscopes have a much higher resolution than either the human eye or any light microscopebecause:a
of their higher magnification.
b. the lenses used are of much higher quality.
c. of the very short (nanometer) wavelengths of electrons.
d. the images are viewed on screens, rather than directly using an eyepiece or ocular lens.
e. it can be used to view stained or living cells.
C
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A complication risk of gastric bypass surgery that bypasses most of the small intestine is
A. loss of muscle tone B. type 2 diabetes C. vitamin and mineral deficiencies D. kidney failure E. cessation of insulin production
How might a pathogenic bacterium be affected by antibodies?
a. The antibodies may stick to multiple bacteria, causing agglutination. b. The antibodies may coat the surface of the bacteria (opsonization), allowing for it to be tagged for phagocytosis. c. The antibodies may block proteins necessary for binding the pathogen to the host. d. The antibodies may block proteins necessary for binding the pathogen to the host, may opsonize the bacterium, or may agglutinate bacteria.
Which of the following organisms does NOT reproduce its cells by mitosis and cytokinesis?
A) A cockroach B) A cow C) A bacterium D) A mushroom E) A banana tree
Using terms from the list below, fill in the blanks in the following brief description of the experiment with Streptococcus pneumoniae that identified which biological molecule carries heritable genetic information
Some terms may be used more than once. Cell-free extracts from S-strain cells of S. pneumoniae were fractionated to __________________ DNA, RNA, protein, and other cell components. Each fraction was then mixed with __________________ cells of S. pneumoniae. Its ability to change these into cells with __________________ properties resembling the __________________ cells was tested by injecting the mixture into mice. Only the fraction containing __________________ was able to __________________ the __________________ cells to __________________ (or __________________ ) cells that could kill mice. carbohydrate lipid R-strain DNA nonpathogenic RNA identify pathogenic S-strain label purify transform Fill in the blank(s) with correct word