Explore topic-wise MCQs in Biochemistry.

This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

Photosystem I used which of the following in its photo-center?

A. P700
B. P800
C. P900
D. P600
Answer» B. P800
Discussion
2.

The earliest photo synthesizers used which of the following as the source of hydrogen?

A. CO2
B. C6H12O6
C. H2O
D. H2S
Answer» E.
Discussion
3.

The carbon-assimilation reactions require ATP and NADPH in the ratio ___________

A. 3:2
B. 2:3
C. 3:4
D. 4:3
Answer» B. 2:3
Discussion
4.

Photosynthesis takes place in sac like membranes called ___________

A. Thylakoids
B. Grana
C. Photosystems
D. Photons
Answer» B. Grana
Discussion
5.

Which pigment is used in human vision?

A. Retinal
B. Vitamin A
C. Ferredoxin
D. Beta-carotene
Answer» B. Vitamin A
Discussion
6.

When compared to retinal, chlorophyll can be described as a pigment that has a ____________

A. Narrow absorption range but high efficiency
B. Narrow absorption range but low efficiency
C. Wide absorption range but high efficiency
D. Wide absorption range but low efficiency
Answer» B. Narrow absorption range but low efficiency
Discussion
7.

If 8 photons are required to produce one molecule of O2, how many photons are required to produce one molecule of glucose?

A. 6
B. 8
C. 48
D. 12
Answer» D. 12
Discussion
8.

PHOTOSYSTEM_I_USES_WHICH_OF_THE_FOLLOWING_IN_ITS_PHOTO-CENTER??$

A. P700
B. P800
C. P900
D. P600
Answer» B. P800
Discussion
9.

THE_EARLIEST_PHOTO_SYNTHESIZERS_USED_WHICH_OF_THE_FOLLOWING_AS_THE_SOURCE_OF_HYDROGEN??$

A. CO<sub>2</sub>
B. C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>
C. H2O
D. H2S
Answer» E.
Discussion
10.

Which of the following systems has an associated water splitting activity resembling that of plants?

A. Photosystem
B. Photosystem I
C. Photosystem II
D. Photosystem III
Answer» D. Photosystem III
Discussion
11.

The carbon-assimilation reactions require ATP and NADPH in the ratio

A. 3:2
B. 2:3
C. 3:4
D. 4:3
Answer» B. 2:3
Discussion
12.

Photosynthesis takes place in sac like membranes called

A. Thylakoids
B. Grana
C. Photosystems
D. Photons
Answer» B. Grana
Discussion
13.

Why light is required for light dependent reactions?

A. It splits ATP molecules which generates the energy necessary to power the light independent reactions
B. It is the source for electrons
C. It splits the water molecules
D. It energizes electrons in the reaction center
Answer» E.
Discussion
14.

The pigment used in human vision is

A. Retinal
B. Vitamin A
C. Ferredoxin
D. Beta-carotene
Answer» B. Vitamin A
Discussion
15.

Which of the following is the correct sequence for the movement of electrons during the light-dependent reactions of plants?

A. P<sub>700</sub>, P<sub>680</sub>, NADP<sup>+</sup>, water
B. P<sub>680</sub>, water, P<sub>700</sub>, NADP<sup>+</sup>
C. Water, P<sub>700</sub>, NADP<sup>+</sup>, P<sub>680</sub>
D. Water, P<sub>680</sub>, P<sub>700</sub>, NADP<sup>+</sup>
Answer» E.
Discussion
16.

When compared to retinal, chlorophyll can be described as a pigment that has a

A. Narrow absorption range but high efficiency
B. Narrow absorption range but low efficiency
C. Wide absorption range but high efficiency
D. Wide absorption range but low efficiency
Answer» B. Narrow absorption range but low efficiency
Discussion
17.

If 8 photons are required to produce one molecule of O2, how many photons are required to produce one molecule of glucose?

A. 6
B. 8
C. 48
D. 12
Answer» D. 12
Discussion