Biology Mcqs No 3

There are 10 Mcqs.Choose the best option.Write all of your answers in one comment (like 1A,2B,3B...)

(1)Which structure is present in cells of eukaryotes but not present in cells of prokaryotes?
A) plasmid
B) chromatin
C) mesosome
D) 80s ribosome

(2)How is the shape of a polypeptide chain maintained when it is coiled into an α helix?
A) disulphide bonds
B) hydrogen bonds
C) hydrophobic interactions
D) ionic bonds

(3)The diagram shows an α 1 : 4 glycosidic bond.

Which molecules contain this bond?
A) amylose and cellulose
B) amylose but not cellulose
C) cellulose but not amylose
D) neither amylose nor cellulose

(4)What will break an ionic bond between amino acids?
A) condensation
B) hydrolysis
C) low temperature
D) pH change

(5)When hydrolyzed, which molecules have products containing a carboxyl group?
1 phospholipids
2 polysaccharides
3 proteins
A) 1 and 2
B) 1 and 3
C) 2 and 3
D) 3 only

(6)Which are features of nuclear division by mitosis?
1- forms cells of equal size to the parent cell
2- forms genetically identical cells
3- semi-conservative replication of DNA
A) 1 and 2 only
B) 2 and 3 only
C) 2 only
D)1, 2 and 3

(7)The diagram shows a cell of an organism formed by reduction division.

What is the diploid number for this organism?
A) 10
B) 20
C) 40
D) 46

(8)Chemical that acts as a neurotransmitter for synapses outside the nervous system is
A) adrenaline
B) nor-epinephrine
C) acetylcholine
D) dopamine

(9)In humans, there are ____ sites of digestion.
A) 2
B) 3
C) 4
D) 5

(10)Vaccination is
A) Natural Active immunity
B) Artificial Active immunity
C) Natural Passive immunity
D) Artificial Passive immunity