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Re: MCAT practice questions

PostPosted: Mon Jun 09, 2014 6:51 am
by goldstandard_mcat
A. Bacteria are prokaryotes which have no nucleus (thus no nuclear membrane) but they have both a cell wall and a plasma membrane (BIO 2.2).


goldstandard_mcat wrote:Which of the following typically have a plasma membrane but no nuclear membrane?
A) Bacteria
B) Bacteriophages
C) Fungi
D) Viruses other than bacteriophages

Re: MCAT practice questions

PostPosted: Mon Jun 09, 2014 6:53 am
by goldstandard_mcat
The bacterium E. coli is normally killed by low concentrations of the antibiotic streptomycin. In a standard E. coli population, about 1 in 106 cells (0.0001%) are mutants that are resistant to streptomycin; that is, they can grow and divide in the presence of the antibiotic. Suppose that a rapidly growing population of E. coli is exposed to low levels of streptomycin. What percentage of the cells will be resistant to streptomycin after 20 generations in the presence of the antibiotic?
A) None of the cells
B) About 0.0001%
C) About 20%
D) About 100%

Re: MCAT practice questions

PostPosted: Sat Jul 12, 2014 4:56 am
by avalonuniversity
Nice questions..like it !

Re: MCAT practice questions

PostPosted: Sat Aug 02, 2014 9:47 pm
by goldstandard_mcat
A box is stationary on an inclined plane. As the angle of the inclined plane determined by measuring from the horizontal - increases, the normal force:
A. decreases nonlinearly.
B. increases nonlinearly.
C. does not change.
D. increases linearly.

Re: MCAT practice questions

PostPosted: Sat Aug 02, 2014 9:48 pm
by goldstandard_mcat
avalonuniversity wrote:Nice questions..like it !


Thank you :-)