CMB and Micro MCQs 2011.pdf

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A question from a previous year

BIOSCI 101: Cellular and Molecular Biology

The electron micrograph above represents a cross-section of a:1. chloroplast.2. mitochondrion.3. eukaryotic flagellum.4. Golgi body.5. ribosome.

Which of the following is true

of both starch and cellulose?1. They can both be digested by humans2. They are both polymers of glucose.

Now for a quick test..


. .4. They are geometric isomers of each other.5. They are both used for energy storage in plants.

Past question

What kinds of molecules pass through a cellmembrane most easily?


. on c2. small and hydrophobic3. large and hydrophobic4. monosaccharides such as glucose5. large and polar

Test question

The 20 different amino acids found in polypeptidesexhibit different chemical and physical propertiesbecause of different:

1. alpha ( ) carbon atoms.


. .3. carboxyl groups attached to the alpha

( ) carbon.4. R groups attached to the alpha ( )

carbon.5. amino groups attached to the alpha

( ) carbon.

Test question

Which of the following statements about enzymes isINCORRECT?1. enzymes may be inactivated by disruption of

their three-dimensional structure2. the substrate binds to the enzyme at the


3. enzymes increase the rate of chemical

reaction by lowering activation energybarriers

4. enzyme function is influenced bytemperature but not by pH

5. some enzymes require a cofactor forcatalytic activity

And a question ..

What is meant by the description "antiparallel" regarding thestrands that make up DNA?

1) The twisting nature of DNA creates nonparallel strands.2)The 5' to 3' direction of one strand runs counter to the 5'to 3' direction of t he other strand.3)Base pairings create unequal spacing between the twoDNA strands.4) One strand contains only purines and the other containsonly pyrimidines.


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Test question

Which of the following is NOT directly involved inthe process of translation?

1. mRNA2. rRNA


.4. aminoacyl-tRNA synthetase5. ligase

A question from the 2010 test

Note: this was qu 21in the 2010 in-coursetest but the wrongfigure was supplied it was meant to bethis one!


The figure above represents the tRNA that recognizes and bindsphenylalanine. Which of the following codons on the mRNA strand codesfor this amino acid?A) 5' CUU 3'B) 5' AAG 3'C) 5' UUC 3'D) 5' UGG 3'E) 5' GAA 3'

There are 61 mRNA codons that specify an amino acid, butonly about 32 tRNAs are actually required to translate them.This is best explained by the fact that:

A) some tRNAs have anticodons that recognize four or moredifferent codons.

A practice question


codon and tRNA are flexible.C) many codons are never used, so the tRNAs that recognizethem are dispensable.D) Some tRNAs are easily destroyed by nucleases.

The host range of a virus is determined by:

A) the proteins on its surface and that of the host.B) whether the viral nucleic acid is DNA or RNA.

Test question 1


t e prot ens n t e cy top asm o t e o st ce .D) the enzymes produced by the virus before it infectsthe cell.E) the enzymes carried by the virus.

Test question 2

The genes for sex pilus construction and for tetracyclineresistance are located together on the same plasmidwithin a particular bacterium. Tetracycline resistancecould spread rapidly from this bacterium to others bythe process of:


B) mutationC) transductionD) meiosisE) conjugation

If genetic engineering was used to move the lac repressor gene ( lac I), along with its promoter, to aposition at some several thousand base pairs away from

its normal position, the most likely outcome would be:

Test question


A) The repressor is no longer made.B) The repressor no longer binds to the operator.C) The repressor no longer binds to the inducer.D) The lac operon is expressed continuously.E) The lac operon functions normally.

Documents

CMB and Micro MCQs 2011.pdf