Online Biochemistry Test - Biochemistry Test 5

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of the following is a nonstandard amino acid?

Cysteine

Isoleucine

Hydroxyproline

Histidine

[#]

Proteins and macromolecular structures take on their higher order structures

by self-assembly

with the help of molecular chaperons

with the help of precursor sequences that are removed from the final structures

all of the above

[#]

In ion-exchange chromatography

proteins are separated on the basis of their net charge

proteins are separated on the basis of their size

proteins are separated on the basis of their shape

either (b) or (c)

[#]

An allosteric activator

increases the binding affinity

decreases the binding affinity

stabilizes the R state of the protein

both (a) and (c)

[#]

What is a protein produced by host cells infected by viruses?

Interferon

Histamine

Antiserum

Vaccine

[#]

The HIV virus infects primarily

brain cells

cells in the immune system

red blood cells

liver cells

[#]

The smooth endoplasmic reticulum (SER) is the site of

phospholipid synthesis

amino acid synthesis

carbohydrate synthesis

protein synthesis

[#]

DNA helicase is used to

unwind the double helix

interact the double helix closely

break a phosphodiester bond in DNA strand

none of the above

[#]

Codon that specify the amino acids often differs in the

first base

second base

third base

none of these

[#]

10.

Degenerated codon differs mostly in

the identities of their second base

the identities of their third base

the wobble position

both (b) and (c)

[#]

11.

Which of the following is not necessary for protein synthesis to occur, once transcription is completed?

tRNA

Ribosomes

mRNA

DNA

[#]

12.

Different DNA polymerases play distinct roles in DNA replication and repair in both prokaryotic and eukaryotic cells. All known DNA polymerases synthesize DNA only in the __________ by the addition of dNTPs to a performed primer strand of DNA.

positive direction

3' to 5' direction

5' to 3' direction

negative direction

[#]

13.

Reverse transcripase from HIV does not

uses RNA as a template

has a 5' to 3' polymerase activity

has a 3'- 5' exonuclease activity

requires a primer

[#]

14.

Which of the following amino acids interact with the DNA or RNA backbone (i.e. phosphate)?

Ile and Val

Lys and Arg

Leu and Ala

Cys and Met

[#]

15.

The lac operon is translated into __________ proteins.

[#]

16.

A human cDNA library

contains DNA for specific human proteins

contains DNA for virtually all of the human proteins in vectors

cannot be used to obtain human genes because it would be radioactive

none of the above

[#]

17.

Which of the following is involved in energy production?

Generation of proton gradients across membranes

Transport of electrons on organic molecules

Conversion of compounds with high energy to those of low energy

All of the above

[#]

18.

Most of the enzymes of the citric acid cycle in a eukaryotic cell are located in the

inner mitochondrial membrane

cytosol

mitochondrial matrix

intermembrane space

[#]

19.

A person with phenylketonuria is advised not to consume which of the following products?

Glycine containing foods

Fat containing food

Glucose

Aspartame

[#]

20.

Molar absorbtivity is the measure of the

amount of light absorbed per unit length

amount of light absorbed per unit concentration

amount of light reflected and absorbed per unit concentration

None of the above

[#]

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