What will be an ideal response?
Mitochondria contain their own DNA and replicate on their own. Why is it that they don't suffer the same consequences as our cells in terms of limited division?
A. Because they have high telomerase
activity.
B. Shortening of the DNA is only a problem
with nuclear DNA; shortening of mitochondrial
DNA isn't catastrophic.
C. Mitochondrial DNA is circular, so it doesn't
shorten when it replicates.
D. Since mitochondrial DNA only contains a
few genes, it can last a lot longer.
E. Because they have high telomerase
activity and their DNA is circular and so
doesn't shorten in replication.
C
Biology & Microbiology
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The enzyme beta-galactosidase acts on lactose to form galactose. In turn, the presence of galactose leads to expression of the enzymes responsible for the metabolism of galactose. In this case, lactose is serving as a carbon source and as a(n)
A. inducer. B. repressor. C. DNA-binding protein. D. operon. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about prokaryotic transcriptional regulation? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
Biology & Microbiology
Humus includes all of the following EXCEPT
a. feces. b. dead organisms. c. leaf litter. d. weathered rock. e. decomposing organic matter.
Biology & Microbiology
Gram-positive bacteria have ____ and appear ____ under the microscope after Gram staining.
A. thick cell walls; pink B. thick cell walls; purple C. thin cell walls; pink D. thin cell walls; purple E. thin cell walls; blue
Biology & Microbiology
What causes a change in the number of chromosomes?
Biology & Microbiology