Online Biochemistry Test - Biochemistry Test 6

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Total number of questions: 20.
Time allotted: 30 minutes.
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The lone pair electrons on oxygen in a H20 molecule

carry a partial positive charge

are not important for the properties of water

carry a partial negative charge

form covalent bonds in ice

[#]

In deoxy hemoglobin (Hb), the Fe (II) is coordinated to

four nitrogens of heme, the proximal His, and a water molecule

four nitrogens of heme and to a water molecule

two nitrogens of heme and to three His residues in Hb

two nitrogens of heme and to three water molecules

[#]

Enzyme-driven metabolic pathways can be made more efficient by

concentrating enzymes within specific cellular compartments

grouping enzymes into free-floating, multienzyme complexes

fixing enzymes into membranes so that they are adjacent to each other

All of the above

[#]

Very low doses of antigen may induce

hypersensitivity

immunological ignorance

low zone tolerance

low zone immunity

[#]

In Rocket Immunodiffusion the length of the rocket is

proportional to the amount of antibody placed in each well

inversely proportional to the amount of antibody placed in each well

inversely proportional to the amount of antigen placed in each well

proportional to the amount of antigen placed in each well

[#]

Small charged molecules, often biogenic amines function as

hormones

neurotransmitters

both (a) and (b)

none of these

[#]

Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it

changes the shape and thus the enzymatic activity of the proteins involved

makes the receptor more likely to capture the signaling, molecule

allows hydrophilic signaling molecules to cross the plasma membrane

None of the above

[#]

In DNA, guanine pairs with

Adenine

Cytosine

Thymine

Uracil

[#]

RNA is synthesized on a DNA template in a process called __________ , which utilizes the enzyme __________

translation, RNA polymerase

transcription, DNA polymerase

transcription, RNA polymerase

replication, DNA polymerase

[#]

10.

Northern blotting is

widely different than southern blotting

another name for southern blotting

analogous to southern blotting

none of the above

[#]

11.

Storage polysaccharide made by animals is

amylopectin

glycogen

cellulose

collagen

[#]

12.

When concentration of the reactants is higher than the equilibrium concentration then

the gibbs free energy will be positive

the gibbs free energy will be negative

more products will be formed

both (b) and (c)

[#]

13.

The first intermediate in TCA cycle is

succinate

fumerate

citrate

malate

[#]

14.

Carbon fixation requires the expenditure of ATP molecules which is generated by

formation of glucose during the Calvin cycle

replenishment of chlorophyll

ETS (electron transfer system) during the light reactions

none of the above

[#]

15.

Manganese is needed for

normal bone structure

reproduction and functioning of central nervous system

both (a) and (b)

muscle strengthening

[#]

16.

Why do fluorescence spectrometers often use double-beam optics?

So a reference solution can be used

To compensate for beam attenuation by the monochromator

To compensate for power fluctuations in the radiation source

All of the above

[#]

17.

For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?

Because a change in dipole moment lowers the energy required for electronic transitions

Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment

Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching

All of the above

[#]

18.

The sequence of amino acids in proteins can be determined by means of

identification of the -NH₂ terminal amino acids

identification of the -COOH terminal amino acids

partial cleavage of the original polypeptide into smaller polypeptides

all of the above

[#]

19.

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

Increased resolution

Decreased resolution

Non-linear detector response

Constant resolution

[#]

20.

One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis?

Conservative theory

Dispersive theory

Semi-conservative theory

Evolutionary theory

[#]

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Online Biochemistry Test - Biochemistry Test 6

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