Steroid hormones usually act via receptors that
a. are coupled to G proteins that activate adenylyl cyclase.
b. activate tyrosine kinases.
c. bind to DNA.
d. activate phospholipase C.
Ans: c. bind to DNA.
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Pinworm is a nematode parasite that lives in the human rectum, and causes itching in the anal area. What best explains the itching symptom?
A. Any kind of parasite will naturally irritate the skin. B. The itching induces the person to scratch, helping to spread the parasite to another person. C. The itching is a side-effect when the immune system has successfully attacked the nematode. D. The itching is because of the mismatch between humans and the parasite’s natural host. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about nematode diseases? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In this freshwater aquatic ecosystem, species composition varies along its length based on rock types, depth, oxygen
concentrations, and temperature.
a. streams b. lakes c. estuaries d. coral reefs e. hydrothermal vents
________ is a beneficial relationship similar to mutualism, in which the relationship is not obligatory.
Fill in the blank(s) with the appropriate word(s).
An embryo was exposed to a chemical early in its development. At birth, there is chromosomal damage to the circulatory system linked to the chemical exposure. What other organ systems should be examined for the same type of damage?
What will be an ideal response?