What separates the strands of DNA in the polymerase chain reaction (PCR) technique?
A) Restriction enzymes
B) Helicase
C) Centrifuge
D) Heat
D
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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?
Cells becoming progressively more specialized in their structure and gene activity is known as:
a. morphogenesis. b. determination. c. differentiation. d. maturation. e. growth.
What possible harmful environmental effects are of concern regarding GM crops?
A) the decreased use of herbicides when GM crops are herbicide-resistant B) the transfer of genetically modified genes to weedy relatives C) the reduction of genetic diversity in all crops D) an increase in allergic reactions in sensitive humans
All of the following are components of peptidoglycan EXCEPT
a. N-acetylglucosamine b. N-acetylmutamic acid c. lipopolysaccharide d. amino acids e. peptide cross-links