5.4 Mitochondria

Question 1

Mitochondria are easily visible under the microscope.
T/F

Answer 1

False,
Mitochondria are only visible under the microscope if they are stained with Janus Green

Question 2

The number of mitochondria per cell depends on __________ of the cell.

Answer 2

physiological activity

Question 3

In terms of shape and size also, a considerable degree of variability is observed in Mitochondria.
T/F

Answer 3

True

Question 4

Generally, the shape of Mitochondria is -

Answer 4

sausage-shaped or cylindrical

Question 5

Mitochondria has:
I. Diameter -
II. Length -

Answer 5

I. Diameter - 0.2 to1 μm
II. Length - 1.0 to 4.1μm

Question 6

Each mitochondrion is a single membrane-bound structure.
T/F

Answer 6

False,
double membrane-bound (outer and inner membrane)

Question 7

The space between the outer and inner membrane of Mitochondria is called ______

Answer 7

Inter-membrane space

Question 8

In Mitochondria, the outer membrane and inner membrane divide its ______ distinctly into two aqueous compartments. Name.

Answer 8

lumen;

2 Aqueous compartments:
I. Outer compartment
II. Inner compartment

Question 9

______ (inner/outer) membrane forms the continuous limiting boundary of the organelle.

Answer 9

Outer membrane

Question 10

The inner compartment of mitochondria is filled with a dense homogeneous substance called _____.

Answer 10

Matrix

Question 11

The inner mitochondrial membrane forms a number of infoldings called ______.

Answer 11

Cristae (singular: crista)

Question 12

In Mitochondria, cristae are ______ (away/towards) from the matrix.

Answer 12

towards

Question 13

In Mitochondria, Cristae helps in ______.

Answer 13

In increasing surface area

Question 14

The two membranes have the same enzymes associated with mitochondrial function.
T/F

Answer 14

False,
Two membranes have their own specific enzymes

Question 15

Mitochondria is the site of ______ respiration.

Answer 15

Aerobic respiration

Question 16

Mitochondria help in ______ (reductive/oxidative) phosphorylation and produce ______ in the form of ____.

Hence, they are called ________

Answer 16

oxidative phosphorylation; cellular energy; ATP;

‘Power houses’ of Cell

Question 17

The matrix of Mitochondria contains:

Answer 17

I. Single circular DNA molecule
II. Few RNA molecules
III. Ribosomes (70S)
IV. Components required for the synthesis of proteins.

Question 18

The mitochondrial ribosome is ______ subunit.

Answer 18

70S

Question 19

Mitochondria divide by ______.

Answer 19

Fission