Algae have cell wall made up of

1. cellulose, galactans and mannans

2. hemicellulose, pectins and proteins

3. pectins, cellulose and proteins

4. cellulose, hemicellulose and pectins

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?

(1) Lysosome

(2) Ribosome

(3) Chloroplast

(4) Mitochondrion

Select the mismatch.

1. Gas vacuoles — Green bacteria Cells

2. Large central vacuoles — Animal cells

3. Protists — Eukaryotes

4. Methanogens — Prokaryotes

Microtubules are the constituents of

(1) spindle fibres, centrioles and cilia

(2) centrioles, spindle fibres and chromatin

(3) centrosome, nucleosome and centrioles

(4) cilia, flagella and peroxisomes

Mitochondria and chloroplast are

I.semi-autonomous organelles.

II. formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery.

Which one of the following options is correct?

(1) Il is true but I is false

(2) I is true but ll is false

(3) Both I and I are false

(4) Both I and II are correct

A complex of ribosomes attached to a single strand of RNA is known as

(1) polymer

(2) polypeptide

(3) okazaki fragment

(4) polysome

Which of the following is not a feature of the plasmids?

(a) Circular structure

(b) Transferable

(c) Single-stranded

(d) Independent replication

Water soluble pigments found in plant cell vacuoles are

(1) chlorophylls

(2) carotenoids

(3) anthocyanins

(4) xanthophylls

Which of the following statements is not true for cancer cells in relation to mutations?

1. Mutations destroy telomerase inhibitor

2. Mutations inactivate the cell control

3. Mutations inhibit production of telomerase

4. Mutations in proto-oncogenes accelerate the cell cycle

Balbiani rings are sites of

1. lipid synthesis

2. nucleotide synthesis

3. polysaccharide synthesis

4. RNA and protein synthesis