Tag: action spectrum and absorption spectrum

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Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

The spaces inside the folds of ER membrane are known as

  1. Thylakoids

  2. Cisternae

  3. Mesosomes

  4. Periplasmic space
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The internal flattened sac-like compartments or spaces formed by the folds of the endoplasmic reticulum membrane are known as cisternae. Thylakoids belong to chloroplasts, and mesosomes are infoldings of the plasma membrane in bacteria.

Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Match the following

a. Bacteria 1. Synthesis and storage of lipids
b. Sphaerosomes 2. Idiogram
c. Chloroplasts 3. Glycocalyx
d. Karyotype 4. Thylakoids

  1. a-3, b-1, c-4, d-2

  2. a-3, b-1, c-2, d-4

  3. a-4, b-3, c-2, d-1

  4. a-1, b-2, c-3, d-4

  5. a-3, b-2, c-4, d-1.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacteria have glycocalyx (a-3). Sphaerosomes are involved in lipid storage (b-1). Chloroplasts contain thylakoids (c-4). Karyotype is represented by an idiogram (d-2).

Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Consider the following processes.
a. $O _2$ evolution
b. $CO _2$ fixation
c. NADPH formation
d. Chlorophyll biosynthesis.
Which of these do not occur in thylakoids?

  1. $1$ and $2$
  2. $2$ and $3$
  3. $3$ and $4$
  4. $2$ and $4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxygen evolution, NADPH formation, and light reactions occur in the thylakoids. CO2 fixation (Calvin cycle) occurs in the stroma, and chlorophyll biosynthesis involves multiple cellular compartments including plastids and cytoplasm, meaning 2 and 4 do not exclusively occur in thylakoids.

Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

If $^{14}CO _2$ is added to a suspension of photosynthesizing chloroplasts, which of the following will be the first compound to be radioactive?

  1. ATP

  2. NADPH

  3. NADH
  4. $3$-phosphor glycerate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the Calvin cycle, CO2 is first fixed by RuBisCO to form 3-phosphoglycerate, which is the first stable radioactive compound.

Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Which one of the following options is true in photsynthesis.

  1. $CO _2$ is oxidized and $ H _2O $ is reduced
  2. $H _2O $is oxidized and $CO _2 is reduce d$
  3. Both $CO _2$ and $H _2O$ are reducedd
  4. Both $CO2$ and$ H2O$ are oxidized
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In photosynthesis, water is oxidized to release oxygen, and CO2 is reduced to form glucose.

Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

With reference to photosynthesis in chloroplasts, consider the following statements.
a. The reactions that break down water and produce oxygen are located on the lumen side of the thylakoid membrane, in granum areas.
b. The molecules of ferredoxin-NADP re-educate that generate NADPH are located on the side of the membrane facing stroma.
Which of the statements given is/are correct?

  1. $1$ only
  2. $2$ only
  3. Both $1$ and $2$
  4. Neither $1$ nor $2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Consider following statements A & B
A - The enzyme acts on 'N' terminal of polypeptide chain
B - The enzyme acts on 'C' terminal of a polypeptide chain
Choose the correct option w.r.t the digestive juices which contain these enzymes

  1. A- Succus entericus B - Pancreatic juice

  2. A - Intestinal juice B - Bile juice in duodenum

  3. A - Pancreatic juice B - Intestinal juice

  4. A - Intestinal juice B - Gastric juice
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carboxypeptidases (C-terminal) are found in pancreatic juice. Aminopeptidases (N-terminal) are found in intestinal juice (succus entericus).

Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Why does the total amount of $CO _2$ in the atmosphere remains constant even though respiration liberates $CO _2$?

  1. $CO _2$ acts as a buffer
  2. $CO _2$ is converted to carbohydrates in photosynthesis
  3. $CO _2$ forms carbonic acid
  4. $CO _2$ undergoes cleavage during photosynthesis.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Most organisms release or exhale $CO _2$ during respiration. This $CO _2$  present in the environment is utilized by plants in the process of photosynthesis with the final product being a carbohydrate. This is how the amount of $CO _2$  in the atmosphere is kept under check.
So, the correct answer is '$CO _2$  is converted to carbohydrates in photosynthesis'.