Online Biochemistry Test - Biochemistry Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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Weak acids generally have pK_a

values less than 1

pK_a values greater than 2

been seldom found in living systems

that cannot be used to buffer

[#]

The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

is stronger than an ordinary single bond

has partial double bond character

both (a) and (b)

is still not completely understood

[#]

The oxygen in hemoglobin and myoglobin is bound to

the iron atom in the heme group

the nitrogen atoms on the heme

histidine residues in the protein

lysine residues in the protein

[#]

Which species lack immunoglobulin light chains?

Camels

Humans

cows

Buffalo

[#]

Infants are most susceptible to bacterial infection due to low circulating levels of IgG

in utero (before birth)

at 0-3 months of age

at 3-12 months of age

at 12-24 months of age

[#]

What is the only common methylation in the DNA of eukaryotes?

Adenosine in GpA dinucleotides

Guanosine in ApGpA trinucleotides

Cytosine in CpG dinucleotides

None of the above

[#]

The anticodon of tRNA

binds to rRNA

binds to an amino acid

binds to the Shine Dalgarno sequence

binds to an mRNA codon

[#]

The transfer of antibiotic-resistant genes from genetically engineered bacteria to disease-causing bacteria __________ .

would be of no concern if it occurred.

has occurred

can never occur

seems unlikely

[#]

The PCR, polymerase chain reaction is becoming the method of choice for

Alteration of gene

screening gene

sterilization of gene

all of these

[#]

10.

How many ATPs are formed during complete oxidation of palmitate?

129

131

[#]

11.

The number of water molecules consumed by the formation of phosphatidyl serine are

[#]

12.

FAD is reduced to FADH₂ during

electron transport phosphorylation

lactate fermentation

Krebs cycle

glycolysis

[#]

13.

Lysine is degraded to acetoacetyl CoA and is described as a

ketogenic amino acid

glucogenic amino acid

keto-gluco amino acid

none of these

[#]

14.

Iodine is a part of thyroid hormone and is essential for the prevention of

goiter

osteoporosis

muscle weakness

diarrhea

[#]

15.

In FT-NMR, how are nuclei excited?

By radio-frequency radiation whose frequency is swept across a predetermined range

By an intense pulse of radiation which contains a wide range of frequencies

By an intense pressure

None of the above

[#]

16.

Which of these effects result from slow injection of a large sample volume?

Increased resolution

Decreased resolution

Non-linear detector response

Constant resolution

[#]

17.

An eluotropic series

ranks solvents by their relative abilities to displace solutes from a given absorbent

ranks column packing material by their relative abilities to retain solutes on the column

is a measure of the solvent adsorption energy

none of the above

[#]

18.

During conventional transformation experiments E. coli cells and plasmid DNA interacts in an environment of

high temperature and Ca⁺⁺

low temperature and Ca⁺⁺

high temperature and Mg⁺⁺

low temperature and Mg⁺⁺

[#]

19.

In the Glycolysis reaction, for each glucose conversion how many ATP's are produced?

[#]

20.

Regulated metabolic pathways are

compartmentalized in eukaryotes

usually regulated at the first step

committed after the first step

all of these

[#]

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