The enzyme responsible for separating the DNA strands during DNA replication is (topoisomerase/primase/helicase).
Fill in the blank(s) with the appropriate word(s).
helicase
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Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane?
A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios. C. Membranes with low amounts of cholesterol are very stable and have increased permeability. D. Membranes with high amounts of cholesterol are very stable and have decreased permeability.
A microbiologist suspects a strain of Staphylococcus aureus is resistant to methicillin. What would be the best approach to test this suspicion?
A. Perform a Gram stain. B. Sequence the chromosome looking for resistance genes. C. Calculate the doubling time for the bacteria. D. Inject the bacteria into a host animal and look for disease symptoms. E. Add methicillin to the growth plates. 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 antibiotic resistance? How does it relate to the question? · What other information is related to the question? Which information is most useful? 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?
How are chlorophyll molecules attached to thylakoid membranes?
a. by a magnesium ion b. with a porphyrin ring c. with a methyl group d. by a hydroxide group e. by a long hydrocarbon side chain
During secondary succession, ecosystems are able to reestablish themselves after a devastating event. Which of these events most likely will lead to primary succession?
A) forest fire B) volcanic eruption C) earthquake D) flood