List the human body's three lines of defense against disease
What will be an ideal response?
Nonspecific external barriers (e.g., skin and mucous membranes), nonspecific internal defenses (e.g., phagocytic cells), and specific (adaptive) internal defenses
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Which of the following enzymes relieves the strain in DNA introduced by unwinding in E. coli?
A. gyrase B. ligase C. primase D. helicase E. SSB
To facilitate the regulation of membrane fluidity, E. coli has the enzyme
A) bacteriorhodopsin. B) desaturase. C) fatty acid convertase. D) gangliosidase. E) unsaturase.
In order to protect the integrity of an mRNA in the cytosol of a cell, a(n) ________ is added to the 3' end during RNA processing.
Fill in the blank(s) with the appropriate word(s).
How might the allele that causes a disease stay in the population if it is fatal to those who have the disease?
a. it occurs only in certain geographic areas b. it disappears but is continuously replaced by mutations c. it is present only in heterozygotes d. it makes the heterozygote resistant to a fatal disease