Ribosomes of Eukaryotic Cell

Q. What is true about ribosomes?

1. These are found only in eukaryotic cells
2. These are self -splicing introns of some RNAs.
3. The prokaryotic ribosomes are 80 S, where 'S' stands for sedimentation coefficient.
4. There are composed of ribonucleic acid and proteins

Q. Match the following columns.

Column I	Column II
A. Endoplasmic reticulum	1. Take part in cellular respiration
B. Free ribosome	2. Take part in osmoregulation and excretion
C. Mitochondrion	3. Synthesis of lipids
D. Contractile vacule	4. Synthesise non-secretory proteins

1. (A)→(3), (B)→(4), (C)→(1), (D)→(2)
2. (A)→(1), (B)→(2), (C)→(4), (D)→(3)
3. (A)→(3), (B)→(2), (C)→(4), (D)→(1)
4. (A)→(3), (B)→(2), (C)→(1), (D)→(4)
5. (A)→(2), (B)→(1), (C)→(3), (D)→(4)

Q. Assertion: Ribosomes are considered as the most primitive cell organelles. Reason: Ribosomes do not occur in all prokaryotic organisms.

1. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
2. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
3. Assertion is true but Reason is false
4. Both Assertion and Reason are false

Q. DNA is not present in:

1. Mitochondria
2. Ribosomes
3. Chloroplast
4. Nucleus

Q. 80s ribosomes can be separated into subunits

1. 50s & 30s
2. 60s & 40s
3. 60s & 20s
4. 70s & 10s

Q. Which of the following is not membrane bound?

1. Mesosomes
2. Vacuoles
3. Ribosomes
4. Lysosomes

Q. Polysome is formed by:

1. A ribosome with several subunits
2. Several ribosomes attached to a single mRNA
3. Many ribosomes attached to a strand of endoplasmic reticulum
4. Ribosomes attached to each other in a linear arrangement

Q. Ribosomes are the cellular components that make proteins in both prokaryotes and eukaryotes.

1. True
2. False

Q. Select the correct statements

1. Prokaryotic ribosomes 80S - 50S larger subunit and 30S smaller subunit
   
2. Prokaryotic ribosomes 70S - 50S larger subunit and 30S smaller subunit
3. Eukaryotic ribosomes 80S - 50S larger subunit and 30S smaller subunit
4. Eukaryotic ribosomes 80S - 60S larger subunit and 40S smaller subunit

Q. Protein synthesis in an animal cell occurs:

1. On ribosomes present in the nucleolus as well as in cytoplasm
2. On ribosomes present in cytoplasm as well as in mitochondria
3. Only on the ribosomes present in cytosol
4. Only on ribosomes attached to the nuclear envelope and endoplasmic reticulum