Online Biochemistry Test - Biochemistry Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
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Amino acids required in the human diet and not synthesized by the body are called

specialized

trace

essential

accessory

[#]

The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .

1.1, and 12.1

6.5, and 8.0

3.3, and 10.5

2.2, and 9.4

[#]

The correlation between free energy ΔG transfer between the aqueous/organic phases and the surface area of amino acid residues

reflects the reduction in solvent-accessible area during protein folding

is only meaningful for the polar amino acids

ignores the important contribution of the peptide bond

is similar to effects seen with SDS denaturation

[#]

Lymphocytes are activated by antigen in the

blood stream

bone marrow

liver

lymph nodes

[#]

IgE provides

immunity against some parasites

complement killings of the cells and phagocytosis

secretions in the body

all of the above

[#]

Which of the following is correct?

Membranes form boundaries around the cell and distinct subcellular components

Membranes act as selectively permeable barrier

Membranes contain varying amount of lipid and protein and some contain small amount of carbohydrates

All of the above

[#]

Transcription of each set of rRNA genes by RNA polymerasel produces

a single 45S rRNA precursor molecule

a single 5S rRNA precursor molecule

a single 18S rRNA precursor molecule

a single 28S rRNA precursor molecule

[#]

Enhancers are regions that

bind RNA polymerase

are adjacent to the TATA box

are CAT box binding proteins

modulate transcription

[#]

Which of these restriction enzymes produce blunt ends?

SaII

EcoRV

XhoI

HindIII

[#]

10.

The ultimate source of energy that sustains living systems is

glucose

oxygen

sunlight

carbon dioxide

[#]

11.

The production or break down of __________ is often coupled with the metabolic reactions of biosynthesis and catabolism.

aspirin

DNA

ATP

CO₂

[#]

12.

Cellulose fibers resemble with the protein structure in the form of

β-sheets

α-helices

β-turns

None of these

[#]

13.

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

[#]

14.

Long-chain fatty acids are oxidized step-wise in one carbon units starting from the

carboxyl end

aliphatic end

both (a) and (b)

none of these

[#]

15.

As a result of the photosynthetic process, which product is formed?

Oxygen

Water

Carbon dioxide

Both (a) and (b)

[#]

16.

If the oxygen is labeled in CO₂ and provide this CO₂ to a plant, where it is expected to find this labeled oxygen after the plant had undergone photosynthesis?

In the water used

In the NADPH

In the carbohydrate produced

In the oxygen given off by the plant

[#]

17.

Chronic consumption of excess selenium can lead to

brittle hair and nails.

muscle weakness,

TPN

diarrhea.

[#]

18.

What does the Michelson interferometer do?

Split a polychromatic beam of radiation into its component wavelengths

Selectively filter certain wavelengths from a beam of I.R. radiation

Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector

none of the above

[#]

19.

The enzyme responsible for breaking the hydrogen bonds, and thus separating the DNA strands during DNA synthesis is

DNA polymerase

strandase

helicase

none of these

[#]

20.

An enzyme that recognizes foreign DNA, and results in a cut in that DNA is called

transposase

helicase

reverse transcriptase

restriction endonuclease

[#]

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Online Biochemistry Test - Biochemistry Test 1

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