You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. Immediately, you know that they are talking about a:
A. carbohydrate.
B. protein.
C. DNA.
D. lipid.
C. DNA.
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There are currently no known predatory bacteria that are adapted to invade or kill nearby cells
Indicate whether the statement is true or false.
Which of the following is(are) located between the primary walls of adjacent cells?
a. intermediate filaments b. myosin c. actin filaments d. middle lamella e. secondary wall
A geneticist conducts a 2-point test cross between two linked genes on Drosophila for body color (wild type gray, b+ and mutant black, b) and wing shape (wild type normal, vg+ and mutant vestigial, vg). She wants the heterozygote for the test cross to be in the repulsion (trans) configuration. What original P generation parents must she cross to create her heterozygote for the test cross?
a) b+b+/vgvg x bb/vg+vg+ b) b+b+/vg+vg+ x bb/vgvg c) b+b/vg+vg x bb/vgvg d) b+b+/vg+vg+ x b+b+/vg+vg+
Even though 90 percent of infections are asymptomatic, why should you always treat amebiasis?
A) The protozoan can cause invasive disease that affects the liver, lungs, and brain. B) The immune system of the host can quickly become compromised. C) Exotoxin production can promote a vigorous inflammatory response in certain patients and also damage the cytoskeleton of the colon's epithelial cells. D) Asymptomatic patients can continue to spread the disease for years before dying themselves. E) Pseudomembranous plaques form along the colon lining as toxins cause tissue damage in 10 percent of hosts.