Which of the following is responsible for the mechanical support, protein synthesis and enzyme transport ?

(1) Cell membrane

(2) Mitochondria

(3) Dictyosome

(4) Endoplasmic reticulum

Specific proteins responsible for the flow of materials and information into the cell are called

(1) membrane receptors

(2) carrier proteins

(3) integral proteins

(4) none of these

Who invented electron microscope ?

(1) Jansen

(2) Edison

(3) Knoll and Ruska

(4) Landsteiner

What is a plasmid ?

(1) Bacterial, linear, dsDNA

(2) Extra chromosomal linear RNA

(3) Extra chromosomal circular dsDNA

(4) Autonomously replicating circular RNA

Cell theory was proposed by

(1) a botanist

(2) a zoologist

(3) a botanist and a zoologist

(4) a psychologist.

Which of the following organelles contain DNA?

(i) Mitochondria (ii) Chloroplasts (iii) Golgi bodies (iv) Ribosomes

(1) (i) and (ii)

(2) (ii) and (iii)

(3) (i) only

(4) (iv) only.

Chromatin is made up of:

(1) DNA and protein

(2) DNA and histone

(3) DNA, RNA, protein

(4) RNA, histone and oil bodies.

Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?

(1) They are absent in animal cells.

(2) They act as channel proteins.

(3) They are absent in plant cells.

(4) They are only externally located

Identify the accurate explanation of mesosome.

It is

(1) a specialised structure of prokaryotic cell formed by extension of plasma membrane into the cytoplasm

(2) the middle layer of the prokaryotic cell wall

(3) the organelle of eukaryotic cell which helps in lipid synthesis

(4) the middle layer of eukaryotic cell wall.

Mitochondria and chloroplast are believed to be bacterial endosymbiont because

I. they have self nucleic acid i.e., circular ds, DNA and RNAs

II. 70s ribosomes

III. their membrane resembles that of bacteria

IV. ETS and ATP forming machinery is present.

(1) I and II

(2) I, II and III

(3) All of these

(4) I and IV