Nucleolus

Q.

What are the three post transcriptional modifications?

Q.

Name the scientist who discovered protoplasm.

Q.

Where does DNA replication occur in a cell?

Q.

Who is the father of cell biology?

Q.

In animal cells, protein synthesis occurs in.

1. Cytoplasm.

2. Nucleolus as well as cytoplasm.

3. Cytoplasm as well as mitochondria.

4. Ribosomes attached to the nuclear envelope.

Q.

How many genes are in the human body?

Q. Can you suggest a simple name to the process if flow of information is in reverse direction (RNA to DNA)?

Q.

What are the 4 parts of the nucleus?

Q. Nucleus is stained by

1. basic dyes like haematoxylin
2. acidic dyes like haematoxylin
3. basic dyes like eosin
4. acidic dyes like eosin

Q. Polycistronic mRNA is characteristic of:

1. Prokaryotes
2. Eukaryotes
3. Both a and b
4. Viruses

Q. A nucleus is absent in the mature

1. Sieve tube cells
2. Mammalian erythrocytes
3. Monocytes
4. Both. A and B.

Q. Pick the three scientists who independently rediscovered Mendel’s work among the following.
i) Sutton ii) Boveri iii) Hugo de Vries iv) Carl Correns v) Erich von Tschermak vi) Morgan

1. i, ii and iii
2. ii, iii and iv
3. iii, iv and v
4. iv, v and vi

Q.

Where are polysomes found?

Q.

Why do females show a barr body in their cells?

Q. The chromosomes are aligned along the spindle equator. This is the key feature of:

1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

Q. Which type of RNA carries the amino acids from the amino acid pool to the site of protein synthesis during translation?

1. rRNA
2. mRNA
3. tRNA
4. hnRNA

Q. The receptors of the hormone, FSH are present in the

1. nucleus
2. extra cellular matrix
3. blood
4. plasma membrane

Q. Polysomes are aggregations of

1. Peroxisomes
2. rRNA
3. Ribosomes and rRNA
4. Several Ribosomes held together by a string of mRNA

Q.

Question 22

Discuss briefly the role of nucleolus in the cells actively involved in protein synthesis.

Q.

What is translation?

Q. Which among the following characters of the model organism “Drosophila melanogaster” is incorrect?

1. They have a life cycle of two weeks
2. They are hermaphrodites
3. They contain eight chromosomes
4. Drosophila genome is 60% homologous to that of the humans

Q. Organelle lacking DNA, but capable of duplication is:

1. Ribosome
2. Nucleus
3. Chloroplast
4. Centriole

Q.

Ribosomal RNA is actively synthesized in

1. Lysosomes

2. Nucleolus

3. Nucleoplasm

4. Ribosomes

Q.

What does cytochrome c reductase do?

Q.

Distinguish between bacteria, archaebacteria and eubacteria.

Q. All members of the Gupta family can roll their tongues. Which of the parts labelled in the given figure carries information regarding this characteristic ?

1. P
2. Q
3. R
4. S

Q.

Which of the following conditions is called monosomic?

1. 2n + 2

2. 2n − 1

3. 2n + 1

4. n + 1

Q.

True or False Questions:

Robert Brown discovered protoplasm in 1831.

(A) True
(B) False

Q. The gene sequence encoding resistance to antibiotic, which helps in identifying and eliminating non-transformants and selectively permitting the growth of transformants is called

1. ori
2. palindromic sequence
3. cloning site
4. selectable marker

Q.

Where are Euglenoids found?