Which statement true about telomere characteristics?
A) they allow duplicated chromosomes to become separated into daughter cells during M phase
B.) found in all living cells
C.) they cap the ends of linear chromosomes and prevent them from being recognized by the cell as broken DNA in need of repair
D.) they contain repeated nucleotide sequences that are required to replicate the ends of linear chromosomes
E.) all are true about telomere characteristics
F.) only B and D are true
G.) only statements C and D are true
Ans: G.) only statements C and D are true
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Explain how using a combination of two antimicrobial drugs helps prevent the development of spontaneously resistant mutants
A. All drugs work synergistically with each other-that is, their combined effects are far greater than either could achieve individually. Two drugs together helps to eliminate microbes, even if they have developed spontaneous mutations that would confer upon them resistance to the drugs. B. It is highly unlikely that the microbe might spontaneously develop two specific mutations to resist the effects of a pair of drugs. As such, even if one drug is resisted by the microbe, the second drug will eliminate the mutated microbe, thus preventing the development of spontaneously resistant mutants overall. C. All drugs work antagonistically with each other-that is, their combined effects are far greater than either could achieve individually. Two drugs together helps to eliminate microbes, even if they have developed spontaneous mutations that would confer upon them resistance to the drugs. D. Drugs can also select for mutations that will enhance the activity of another drug. So, each of the paired drugs will help to select for spontaneous mutations that enhance the activity of the other drug in the pair.
In the reaction H2O + CO2 + carbonic anhydrase --> H+ + HCO3-+ carbonic anhydrase, carbonic anhydrase is a(n)
a. reactant. b. product. c. enzyme. d. active site
The region between the bacterial cell membrane and the cell wall is called the outer membrane.
Answer the following statement true (T) or false (F)
The substitution rate is expressed in terms of substitutions per generation; however, molecular clock estimates show that substitutions accumulate annually regardless of the generation time
What explanation for this discrepancy is illustrated in the figure below? What will be an ideal response?