Biochemistry Archives - Page 27 of 102 -

If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?

Question: If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?
[A].

The disease organism itself and antigens for the disease organism

[B].

A very high level of antibodies against the disease antigens

[C].

Memory B lymphocytes for the antigen of this disease organism

[D].

All of the above

Answer: Option D

Explanation:

No answer description available for this question.

If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body? Read More »

Biochemistry, Immune Response

During exposure to a foreign invader, there are more __________ present in the vertebrate body than before exposure

Biochemistry, Immune Response / admin

Question: During exposure to a foreign invader, there are more __________ present in the vertebrate body than before exposure
[A].

antibodies

[B].

lymphocytes

[C].

macrophages and antigens

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

During exposure to a foreign invader, there are more __________ present in the vertebrate body than before exposure Read More »

Biochemistry, Immune Response

Column efficiency is measured in terms of number of plates which is

Biochemistry, Hplc / admin

Question: Column efficiency is measured in terms of number of plates which is
[A].

inversely related to the square of the peak width

[B].

directly related to the square of the peak width

[C].

inversely related to the cube root of the peak width

[D].

directly related to the square of the peak width

Answer: Option A

Explanation:

No answer description available for this question.

Column efficiency is measured in terms of number of plates which is Read More »

Biochemistry, Hplc

For a typical adsorbent such as silica gel, the most popular pore diameters are

Biochemistry, Hplc / admin

Question: For a typical adsorbent such as silica gel, the most popular pore diameters are
[A].

10 and 50 A°

[B].

60 and 100 A°

[C].

100 and 150 A°

[D].

150 and 200 A°

Answer: Option B

Explanation:

No answer description available for this question.

For a typical adsorbent such as silica gel, the most popular pore diameters are Read More »

Biochemistry, Hplc

Dwell volume is defined as

Biochemistry, Hplc / admin

Question: Dwell volume is defined as
[A].

the volume of solvent contained in a liquid chromatographic column

[B].

the time required for the gradient to reach the column

[C].

the volume of the column between the point at which solvents are mixed and the beginning of the column

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Dwell volume is defined as Read More »

Biochemistry, Hplc

An eluotropic series

Biochemistry, Hplc / admin

Question: An eluotropic series
[A].

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

[B].

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

[C].

is a measure of the solvent adsorption energy

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

An eluotropic series Read More »

Biochemistry, Hplc

Which of the following statements is true for a refractive index detector in HPLC?

Biochemistry, Hplc / admin

Question: Which of the following statements is true for a refractive index detector in HPLC?
[A].

It is more sensitive than a UV detector

[B].

It can only be used for isocratic elutions

[C].

It does not respond to many solutes

[D].

none of above

Answer: Option C

Explanation:

No answer description available for this question.

Which of the following statements is true for a refractive index detector in HPLC? Read More »

Biochemistry, Hplc

A gradient elution in HPLC is one in which the composition of the solvent

Biochemistry, Hplc / admin

Question: A gradient elution in HPLC is one in which the composition of the solvent
[A].

remains constant

[B].

is changed continuously or in a series of steps

[C].

both (a) and (b)

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

A gradient elution in HPLC is one in which the composition of the solvent Read More »

Biochemistry, Hplc

An isocratic elution in HPLC is one in which the composition of the solvent

Biochemistry, Hplc / admin

Question: An isocratic elution in HPLC is one in which the composition of the solvent
[A].

remains constant

[B].

changes continuously

[C].

changes in a series of steps

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

An isocratic elution in HPLC is one in which the composition of the solvent Read More »

Biochemistry, Hplc

In reversed phase HPLC, there is a

Biochemistry, Hplc / admin

Question: In reversed phase HPLC, there is a
[A].

non polar solvent/polar column

[B].

polar solvent/non-polar column

[C].

non polar solvent/non-polar column

[D].

any of the above

Answer: Option B

Explanation:

No answer description available for this question.

In reversed phase HPLC, there is a Read More »

Biochemistry, Hplc