Root epidermal cells can passively transport ions inward from the soil because they cannot follow a
concentration gradient.
Indicate whether the statement is true or false.
ANS: F, have to actively
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Viruses _____
A) manufacture their own ATP, proteins, and nucleic acids B) use the host cell to copy themselves and make viral proteins C) use the host cell to copy themselves and then viruses synthesize their own proteins D) metabolize food and produce their own ATP
The most important vector of Lyme disease in the eastern United States is
A. Dermacentor virabilis. B. Dermacentor andersoni. C. Staphylococcus aureus. D. Ixodes scapularis.
Which of the following statements about plant toxins against herbivores is false?
A. The toxin may be kept in a membrane-bound structure to keep it from harming the plant. B. The toxin may not be toxic unless it is metabolized in the intestine of a herbivore. C. The toxin may have also have a bad taste. D. Even a little bit of the toxin will be deadly. E. Some toxins can over stimulate particular physiological processes.
During an infection, lymph nodes swell because ________ cells accumulate inside them
a. natural killer (NK) cells b. B c. T d. mast