Do Hox gene clusters exist in humans? If so, how many are known to exist?
What will be an ideal response?
Yes, Hox gene clusters exist in humans; four are known to exist.
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The photosystem channels the excitation energy gathered by absorption of light by any one of the pigment molecules to a specific reaction center chlorophyll, which in turn passes the energy to
A. photosystem I. B. photosystem II. C. the primary electron acceptor. D. the secondary electron center. E. cytochrome.
Which type of leukocyte contains heparin, an anticoagulant?
a. neutrophils b. basophil c. monocytes d. eosinophils e. megakaryocytes
Honeybees can detect a variety of odorants through olfactory receptors on their antennae. You genetically engineer a receptor to be gated by the explosive chemical TNT, and use a transgene to express the receptor in honeybee olfactory neurons. What would this provide to the bee?
Honeybees have an incredible ability to distinguish thousands of different odorant molecules, using their large repertoire of olfactory receptors. A wide variety of different types of chemicals can be detected as odorants -- they simply require olfactory neurons with a receptor that can bind the chemical and transduce that stimulus into a receptor potential. A. the ability to taste TNT B. it would have no effect C. the ability to smell TNT D. the ability to collect TNT molecules E. the ability to see TNT 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 olfaction? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Chlorofluorocarbons (CFCs) are one of the main gasses that contribute to the destruction of the ozone layer. Which of the following is not a source of CFCs?
a. Plastic foam b. Coolants in appliances c. Aerosol cans d. Solvents e. Exhaust from automobiles