Diatoms have a distinctive two-piece cell wall of silica called a frustule.
Answer the following statement true (T) or false (F)
True
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At the molecular level, the "choice" between lytic and lysogenic pathways is determined by:
A. the positive regulatory effects of a large number of bacteriophage proteins produced soon after infection. B. the negative regulatory effects of a large number of bacteriophage proteins produced soon after infection. C. the positive regulatory effects of a small number of bacteriophage proteins produced soon after infection. D. the negative regulatory effects of a small number of bacteriophage proteins produced soon after infection. E. the positive and negative regulatory effects of a small number of bacteriophage proteins produced soon after infection.
Leaching is most likely to affect the nutrients plants need in which soil horizon?
A. Bedrock B. Subsoil C. Topsoil D. Soil base
If scientists are trying to use what they know about HSV to devise a means of protecting other people from being infected, which of the following would have the best chance of lowering the number of new cases of infection?
A) vaccinate of all persons with preexisting cases of HSV B) interfere with new viral replication in preexisting cases of HSV C) treat HSV lesions to shorten the breakout D) educate people about avoiding sources of infection
As blood moves away from the heart toward the tissues, the relative size of blood vessels ________, the blood pressure ________, and the velocity of blood flow ________
A) decreases; decreases; decreases B) decreases; increases; increases C) decreases; decreases; increases D) increases; decreases; decreases