Agricultural chemicals include such things as ________.
What will be an ideal response?
fertilizers; pesticides; herbicides
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In the blood clotting process, platelets arrive at the site of damage and start secreting substances to attract more platelets. More platelets arrive at the site and secrete attractants to recruit more platelets. This is an example of
A. negative feedback. B. positive feedback. C. feedforward regulation. D. paracrine signaling. E. electrical signaling.
What will be the effect of a drug that prevents the release of intracellular calcium?
a. a decreased number of IPSPs b. a decreased number of EPSPs c. a prolonged hyperpolarization d. increased neurotransmitter release e. decreased neurotransmitter release
Why is it important to have an antibiotic resistance gene in the cloning plasmid?
a. It makes the bacteria resistant to the antibiotic. b. It provides a way for researchers to sort the bacteria that have the cloning plasmid from the bacteria that don't have the cloning plasmid. c. It aids scientists in developing new antibiotic treatments. d. It provides a way for sorting bacteria that have the gene of interest from the bacteria that just have an "empty" cloning plasmid. e. It makes the bacteria produce more clones.
Which of the following are NOT structures by which viruses adhere to their host cells?
a. Capsule b. Spikes c. Fimbriae d. Slime layer