In a small population of cockroaches living in your kitchen, only a few roaches mate in one year. This can lead to random changes in allele frequency in the population through
A. selection.
B. mutation.
C. migration.
D. genetic drift.
Answer: D
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A particular strain of yeast produces strains with a mutant cdc2 gene, resulting in little to no production of the Cdc2 protein kinase. As a result, one would expect that these cells would
A) not enter M phase. B) not have the nuclear envelope disperse. C) lack chromosome condensation. D) all of the above E) none of the above
Plant cells produce oxygen gas ____
a. by splitting carbon dioxide b. during respiration
c. by splitting ribulose bisphosphate d. by splitting molecules of water e. by breaking down glucose
You've finished your homework, so you settle into your favorite chair to play your video games. "Going into your Skinner box?" your roommate jokes. What does a video game have in common with the traditional Skinner box? (Check all that apply)
_____ conditioned stimulus is associated with a reward _____ food pellets are dispensed _____ involves involuntary behavior by the subject _____ involves voluntary behavior by the subject _____ rapid feedback _____ rat subjects _____ repeated series of actions and rewards 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 what was studied with the Skinner box and what behaviors are exhibited when playing video games? 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? Reflection 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?
An experiment involves inoculating a variety of media with a NaCl concentration ranging from 1% to 25%. Which of these media would have the lowest water concentration?
1% NaCl 5% NaCl 10% NaCl 25% NaCl