A bacterium that catabolizes a compound by linking ion pumps to establish a proton or sodium motive force for energy
A) can circumvent substrate-level and oxidative phosphorylation.
B) makes insufficient energy to grow but enough for cellular maintenance to survive.
C) requires a second bacterium to cooperatively drive the gradient.
D) still requires another carbon substrate to provide a carbon source.
Answer: A
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In eukaryotes, genetic material is packaged tightly in the nucleus. Which one of the following most accurately lists the components in order of increasing size (i.e., from smallest to largest)?
A. nucleotide, DNA duplex, chromatid, nucleosome, chromosome B. chromosome, nucleosome, chromatid, DNA duplex, nucleotide C. chromosome, chromatid, nucleosome, DNA duplex, nucleotide D. nucleotide, DNA duplex, nucleosome, chromatid, chromosome E. nucleotide, nucleosome, DNA duplex, chromatid, chromosome
Which of the following is the correct order of the levels of DNA packaging in eukaryotic chromosomes?
A) nucleosome ? chromatin fiber ? looped domains ? heterochromatin B) nucleosome ? looped domains ? chromatin fiber ? heterochromatin C) heterochromatin ? nucleosome ? chromatin fiber ? looped domains D) chromatin fiber ? heterochromatin ? nucleosome ? looped domains E) chromatin fiber ? nucleosome ? looped domains ? heterochromatin
What is MRSA?
A) tuberculosis bacteria resistant to antibiotics B) any bacteria resistant to antibiotics C) antibiotics used as a last resort for resistant bacteria D) a form of skin bacteria that's resistant to methicillin
A warning sign of possible cancer would be any of the following EXCEPT:
A) persistent, unusual bleeding B) a change in bowel habits C) sudden development of fever, nausea, and diarrhea D) a change in shape, color, or surface of a skin lesion