Ribosomes of Prokaryotic Cell

Q. Which of the following nucleic acids is present in an organism having 70S ribosome only?

1. Single stranded DNA with protein coat
2. Double stranded DNA enclosed in nuclear membrane
3. Double stranded circular DNA with histone proteins
4. Double stranded circular naked DNA

Q.

Question 16

What does 'S' refer in a 70S and 80S ribosome?

Q.

A cell has mitochondria, ribosomes, smooth and rough ER, and other parts. Based on this information, it could not be

1. a cell from a pine tree
2. an yeast cell
3. Actually, it could be any of the above.
4. a bacterium

Q.

Photosynthesis occurs in all cells of the plant.

1. True
2. False

Q.

Question 19

What is the function of a polysome? (Gk. Poly = many, Soma = body)

Q.

To initiate translation, the mRNA first binds to

1. No such specificity exists

2. The smaller ribosomal sub-unit

3. The larger ribosomal sub-unit

4. The whole ribosome

Q. Prokaryotic ribosomes are made of

1. 50S and 30S units
2. 50S and 20S units
3. 40S and 30S units
4. 60S and 40S units

Q.

Name the cellular factor responsible for synthesis of proteins in translation.

Q. Which of the following nucleic acids is present in an organism having 70S ribosome only?

1. Single stranded DNA with protein coat
2. Double stranded circular naked DNA
3. Double stranded DNA enclosed in nuclear membrane
4. Double stranded circular DNA with histone proteins

Q. Which is a true statement about ribosomes?

1. Ribosomes are active in carbohydrate synthesis.
2. Ribosomes contain DNA and protein.
3. Ribosomal subunits leave the nucleus after being formed by the nucleolus.
4. 80 s ribosomes are found in prokaryotes.

Q. Which organelle is also known as Palade particle?

1. Smooth Endoplasmic Reticulum
2. Ribosomes
3. Lysosomes
4. Rough Endoplasmic Reticulum

Q.

Do nerve cells have mitochondria?

Q. The only organelle apart from the primitive nucleus, that can be found in a prokaryote is the

1. chloroplast
2. lysosomes
3. ribosomes
4. mitochondria

Q. Polysome is

1. ribosomes and rRNA
2. ribosomes and mRNA
3. several ribosomes
4. ribosomes and tRNA

Q.

A cell that lacks chloroplasts does not

1. evolve CO₂

2. liberate O₂

3. need H₂O

4. utilize sugars

Q.

An organism exclusively with 70S type of ribosome contains one of the following:

1. DNA enclosed within the nuclear membrane

2. Circular naked DNA

3. Double-stranded DNA with protein coat

4. Single-stranded DNA with a protein coat

Q. Polysome is a chain of

1. Oxysomes
2. Sphaerosomes
3. Dictyosomes
4. Ribosomes

Q. Polysome is

1. ribosomes and rRNA
2. ribosomes and mRNA
3. several ribosomes
4. ribosomes and tRNA

Q. Distinguish the ribosomes of prokaryotic cells from that of eukaryotic cells?

Q. Besides proteins, ribosomes contain

1. DNA
2. RNA
3. Both DNA and RNA
4. Lipids

Q. Single membrane bound organelles are

1. Lysosome
2. Glyoxysome
3. Sphaerosome
4. All of the above

Q.

Leaves absorb green light and so appear green in colour.

1. True
2. False

Q. Subunits of 80S ribosomes are

1. 40 s
2. 60 s
3. 40 s and 60 s
4. None of the above

Q.

The kitchen of the cell is:

1. (a) Mitochondria

2. (b) Chloroplast

3. (c) Endoplasmic reticulum

4. (d) Golgi apparatus

Q.

Which one of the following is not true for ribosomes?

1. Made of two subunits

2. Form polysome

3. May attach to mRNA

4. Have no role in protein synthesis

Q. The only organelle apart from the primitive nucleus, that can be found in a prokaryote is the

1. chloroplast
2. lysosomes
3. ribosomes
4. mitochondria

Q. rRNA present in 40 S subunit of ribosome is

1. 5 S
2. 5.8 S
3. 18 S
4. 16 S

Q.

When do two ribsome units separate?

Q. Short / Long answer type questions.
Explain the following terms rough and smooth endoplasmic reticulum, cisterna, vesicle, cristae, stroma lamella, granum thylakoid, proplastid, polyribosome, tonoplast, nuclear envelope, chromatin, and chromosome.

Q. A common feature shared by animals, plants, bacteria and viroids is the presence of

1. RNA
2. DNA
3. proteins
4. cell wall