How can it be determined whether a mutant that constitutively expresses the lac genes has a mutation that inactivates the repressor or a mutation in the operator?
What will be an ideal response?
Ans: Adding a wild-type copy of the lacI gene to the cells will restore control of the operon if the repressor is mutant, but not if the operator is mutant.
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A plant researcher wants to construct a synthetic cellulose fiber from 20 glucose molecules. How many molecules of CO2 and glyceraldehyde-3-phosphate are needed to construct the fiber?
A. 20, 40 B. 120, 60 C. 120, 40 D. 20, 60 E. 120, 120 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 the Calvin cycle, carbon dioxide, and glyceraldehyde-3-phosphate? What other information is related to the question? Choose Answer Do you have all the information needed to determine the likely outcome? 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?
The majority of the heat that is transferred from the earth to the atmosphere is transferred by:
a. radiation of heat into the atmosphere. b. evaporation of water. c. absorption by the lithosphere. d. reflection of heat into space.
All tissues and organs of an adult animal arise from
three primary tissue layers, or germ layers that form in early embryos: __________, __________, and __________ into blood. Fill in the blank(s) with the appropriate word(s).
Which type of cell contains a nuclear membrane?
a. Eukarya b. Prokarya c. Bacteria d. Archaea