Ribosomes of Eukaryotic Cell

Q. Ribosomes are membrane bound organelles.

1. False
2. True

Q. Protein synthesis in an animal cell occurs:

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

Q. Non membranous structures that are required for protein synthesis:

1. Lysosomes
2. RER
3. Ribosomes
4. SER

Q. Many ribosomes associate with a single mRNA to form multiple copies of a polypeptide simultaneously. This string of ribosomes are termed as

1. centrosome
2. polyhedral bodies
3. polysome
4. nucleosome

Q. Ribosomes are membrane bound organelles.

1. False
2. True

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

Q. The two subunits of ribosome remain united at a critical ion level of:

1. Magnesium
2. Calcium
3. Copper
4. Manganese

Q. Which of the following is not membrane bound?

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