Tag: metabolism, cell respiration, and photosynthesis

Quizzes (10) Questions (154)

Questions Related to metabolism, cell respiration, and photosynthesis

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

In a bacterial photosynthesis, which of the following is present? 

  1. PS- I is present

  2. PS- II is present

  3. Both PS- I and PS- II present

  4. None of the PS are present
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are two types of photosystems, the photosystem I (PS- I) and the photosystem II (PS II). These are the structural and functional protein components in the photosynthesis. The photosytem I is present in the green and purple bacteria that conduct the bacterial photosynthesis where as the photosystem II is present in the cyanobacteria that conduct the normal plant photosynthesis.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Ferredoxin is a component of the

  1. PS- I.

  2. PS- II.

  3. Hill reaction.
  4. P$ _{680}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ferredoxin is an iron-containing protein, associated with photosystem I. The ferredoxin accepts electrons from photosystem I and passes them to oxidized NADP to form reduced $NADPH _2$. The enzyme responsible for reduction of NADP is called as NADP ferredoxin oxidoreductase.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

All of these are associated with Photosystem II except

  1. Electron transport chain

  2. A reaction center

  3. ATP

  4. NADPH

  5. Water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Photosystem II or PS II is a photosynthetic pigment system along with some electron carriers that is located in the appressed part of grana thylakoids. The PS II contains chlorophyll-b and some forms of chlorophyll-a.
*PS II picks up electron released during photolysis of water and the electron is extruded as the light energy is absorbed by PS II.
*PS II is composed of following pigment molecules:
Chl-a : one molecule- reaction centre
Chl-a 670: 200 molecules- Antenna chlorophyll
Chl-b: upto 200 molecules- Accessory pigments
Carotenoids: up to 50 molecules- Accessory pigments
*PS II takes part in non cyclic photophosphorylation which results in the formation of ATP and NADPH.
Hence options 'A reaction centre, ATP, NADPH and Water' are associated with Photosystem II.
Electron Transport Chain or ETC is present in the inner mitochondrial which contains various enzymes and co-enzymes and act as hydrogen and electron carriers. Hence ETC is not associated with Photosystem II.
So, the correct answer is 'Electron transport chain'.
Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

During photosynthesis, electrons are boosted to a higher energy level from

  1. Photosystem I

  2. Photosystem II

  3. Photosystems I and II

  4. Chemiosmosis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During photosynthesis light energy is converted to chemical energy of glucose. Light energy is absorbed by a pair of chl a molecules, of PS I or PS II, this excited chl a molecule releases one e$^-$, that moves through the ETS of the PSI and PSII releasing energy at each level during the transport, used for the formation of ATP 

So, the correct answer is 'Photosystems I and II'

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Which of the following is wrongly matched ________________.

  1. (a)Sorghum -Kranz Anatomy

  2. (b)PEP carboxylase -Mesophyll cells

  3. (c)Blackman -Law of limiting factors
  4. (d)Photorespiration -$C _{3}$ plants

  5. (e)PS II -P700
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

PS II (Photosystem II) is associated with the P680 reaction center, not P700. P700 is the reaction center for PS I (Photosystem I).

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Read the following four statements- A, B, C and D and select the right option having both correct statements.
(A) Z scheme of light reaction takes place in presence of PS I only.
(B) Only PS I is functional in cyclic photophosphorylation.
(C) Cyclic photophosphorylation results into synthesis of ATP and NADPH$ _{2}$.
(D) Stroma lamellae lack PS II as well as NADP.

  1. (B) and (D)

  2. (A) and (B)

  3. (B) and (C)

  4. (C) and (D)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Z scheme of light reaction is non cyclic fow of electron from PSII through quinone, cyt $b _6$ f complex and plastocyanin to NADPH via PSI; it does not return to PSII. NADP reductase enzyme is located on stromal side of PSI; Z scheme includes both PSI and PSII. Absence of PS-II leads to non cyclic photophosphorylation in which electrons are passed from PS-I, via electron transfer chain, to back to PS-I with formation of ATP. Cyclic photophosphorylation does not pass electrons to NADP; rather electrons are passed back to PSI. Result is formation of ATP but no NADPH2. Stroma lamellae have PSI only but lack PSII and NADP reductse. Statements B an D are correct. Correct answer is A.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Pigment system- I is

  1. Chlorophyll- 683

  2. Chlorophyll- 673

  3. Chlorophyll- 695

  4. P- 700
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Photosystem I is the second photosystem in the photosynthetic light reactions of algae, plants and some bacteria. Photosystem I is so named because it was discovered before photosystem II. Reaction centre of it is 700 nm.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Photosystem-II occurs in

  1. Stroma

  2. Grana

  3. On surface of mitochondria

  4. On cytochrome
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosystem II is the first link in the chain of photosynthesis. It captures photons and uses the energy to extract electrons from water molecules. First, when electrons are removed water molecules are broken into oxygen gas which bubbles away, and hydrogen ions, which are used to power ATP synthesis. Photosystem II is located in the thylakoids and stacks of thylakoids is known as grana. 

So the correct option is 'Grana'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

In PS I, the carrier that picks up electrons from $P _{700}$ is

  1. Fe protein

  2. Fe-S protein

  3. Fe-Cu protein

  4. Fe-Mg protein
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A photosystem is composed of chlorophyll 'a' molecule which can absorb the wavelength of 700 nm. The chlorophyll a molecule acts as a reaction centre. PS-I is involved in a non-cyclic type of photophosphorylation where there is a chain of electron carriers and acceptors that transmits the electron from one to another. The primary electron acceptor is the ferredoxin molecule which is composed of Fe-S protein

So, the correct option is Fe-S protein'

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

In pigment system II, active chlorophyll is

  1. $P _{680}$
  2. $P _{700}$
  3. $P _{673}$
  4. $P _{720}$.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The plant needed enough energy to do the biosynthetic reactions. Its reaction centre is a molecule called P680 which absorbs light maximally at 680 nm.

So the correct option is 'P$ _6$$ _8$$ _0$.'