NEET Test 49

Result

NEET Test 49

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Which one of the following sets of ions represents a collection of isoelectronic species?

A
N^3–, O^2–, F^–, S^2–

B
Li⁺, Na⁺, Mg²⁺, Ca²⁺

C
K⁺, Cl^–, Ca²⁺, Sc³⁺

D
Ba²⁺, Sr²⁺, K⁺, Ca²⁺

Solution

K⁺, Cl^–, Ca²⁺ and Sc³⁺ have all 18 electron with Argon configuration.
Question 2
4 / -1

Adhesion character of bacteria is due to the presence of which component?

A
Nuclear membrane

B
Plasma membrane

C
Glycocalyx

D
Cell wall
Solution
- Glycocalyx is the outermost layer consisting of a coating of mucous or polysaccharides macromolecules,helping in adhesion and protecting the cells.
- In some bacteria this layer is thin and is present as loose sheath known as slime layer, it protects the cell from loss of water and nutrients.
- Some bacteria have thick and tough covering known as the capsule.
- It provides gummy and sticky character to cell and allows bacterium to hide from host’s immune system.
Question 3
4 / -1

Mitochondria and chloroplast are

(a) Self-duplicating organelles.
(b) Arise from pre-existing ones, containing circular DNA, 70S ribosomes and protein synthesizing machinery.

Which of the following statement is correct?

A
Both a and b are correct

B
a is correct, but b is incorrect

C
Both a and b are incorrect

D
a is incorrect, but b is correct
Solution
- Mitochondria and chloroplasts are self-duplicating and semi-autonomous cell organelles.
- New mitochondria and chloroplasts arise by division of pre-existing ones, or from proplastids in case of chloroplast.
- For duplication they have circular DNA, 70S ribosomes and different types of RNAs i.e., mRNA, tRNA, rRNA for protein synthesis.
- They can synthesize some proteins but receives other proteins from cytoplasm.
Question 4
4 / -1

Position of future cell plate is determined by?

A
Centriole

B
Intermediate filaments

C
Microfilaments

D
Microtubules
Solution
- Position of future cell plate is determined by microtubules. Microtubules are hollow, unbranched cylindershaving a diameter of about 25 nm with a hollow core of about 15 nm.
- Some other functions of microtubules are-
(a) Helps in formation of the spindle and astral rays during cell division.
(b) Forms cytoskeleton of cilia and flagella.
(c) Helps in cell motility and generating rigidity, shape, and form of the cell.
(d) Allows Anaphasic movement of chromosomes.
(e) Helps in intracellular transport of inorganic ions and nutrients.
- Centrosome is an organelle containing two cylindrical structures called centrioles.
- Microfilaments are solid, unbranched, rod-like fibrils of indefinite length found in eukaryotic cells.
- Intermediate filaments are non-contractile hollow filaments of acidic proteins.