Structured William's model P. Can describe the changes in intracellular components of the cell during growth. Q. Cannot describe the death phase of the cells. R. Can describe the variation of size of cells in the different phases of growth. S. Cannot describe the lag period of growth. Which one of the following is correct?

Which of the following statement(s) is/are CORRECT for antigen activated effector T cells?
P. CD4+ cells make contact with macrophages and stimulate their microbicidal activity.
Q. CD4+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
R. CD8+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
S. CD8+ cells make contact with virus infected cells and kill them.

A

Q only

B

Q and S only

C

P, Q and S only

D

P, Q, R and S

Which of the following statements are correct regarding common differences between plant and animal cells?
1. Plant cells have cellulose cell wall, while animal cells lack it.
2. Plant cells lack plasma membrane, while animal cells have it.
3. Mature plant cell have a large vacuole, while animal cells have numerous small vacuoles.

A

1 and 2

B

2 and 3

C

1 and 3

D

1, 2 and 3

Two involute gears are designed to mesh for a given centre distance and a given angular velocity ratio (other than 1). During assembly, the centre distance has increased slightly. Then which of the following changes occur? (i) Velocity ratio changes (ii) Pressure angle changes (iii) Pitch circle diameter changes (iv) Working depth changes (v) Base circle radius changes Select the correct answer using the code given below.

A

1, 2 and 3

B

2, 3 and 4

C

2 and 5

D

3 and 5

Substrate consumption in lag phase of microbial growth is primarily used for
P. Turnover of the cell material.
Q. Maintenance of intracellular pH.
R. Motility.
S. Increase in cell number.

A

P, Q and S only

B

Q, R and S only

C

P, Q and R only

D

S only

Consider the following statements regarding cell cycle and choose the correct answer:
1. During G₁ phase the cell grows in size and there is an active synthesis of RNA and proteins
2. The third stage of the cell cycle is termed G₂ phase
3. In the mitotic phase, the DNA molecule of each chromosome replicates by the synthesis of a new DNA molecule on the template of the existing DNA

A

Only 1 and 2 are correct

B

Only 2 and 3 are correct

C

Only 3 is correct

D

Only 1 and 3 are correct

A small and medium enterprise imports two components A and B from Taiwan and China respectively and assembles them with other components to form a toy. Components A contributes to 10% of production cost while components B contributes to 20% of production cost. Usually the company sells this toy at 20% above the production cost. Due to increase in the raw material and labour cost in both the countries ,component A became 20% costlier and components B became 40% costlier. Owing to these reasons the company increased its selling price by 15%. Considering that cost of other components does not change. What will be the profit percentage if the toy is sold at the new price?

A

15.5%

B

25.5%

C

35.5%

D

40%

Diauxic pattern of biomass growth is associated with
P. Multiple lag phases.
Q. Sequential utilization of multiple substrates.
R. Simultaneous utilization of multiple substrates.
S. Absence of lag phase.

A

P, R

B

P, Q

C

R, S

D

Q, S

A solid-oxide fuel cell is fed with carbon monoxide and reacts with air to produce CO2. This reaction will produce 2 electrons which are used to power an electric circuit external to the fuel cell. The reaction equation is shown below: 2CO(g) + O2(g) -> 2CO2(g) ΔHr° = -565.96 kJ/mol This reaction does not occur for other types of fuel cells which use a catalyst, such as polymerelectrolyte membrane or phosphoric-acid fuel cells. The presence of carbon monoxide on the anode side of these types of fuel cells will cause catalyst poisoning, reducing the efficiency and voltage of the fuel cell. Determine the rate of enthalpy change for a carbon dioxide production rate of 208 mol/hr. The extent of the reaction occurring in the fuel cell can be obtained by the following equation: where:

A

-16.35 kW

B

-15.35 kW

C

-16.45 kW

D

-15.45 kW

Assertion (A): Where any special or local law prescribes for any suit appeal or application a period of limitation different from period prescribed by the Schedule, the provisions of Section 3 of Limitation Act, 1963 shall apply as if such period were the period prescribed by the schedule.
Reason (R): Where a Special Law prescribes a period of limitation for filing appeal but there is no provision therefore under Limitation Act, 1963, the period of limitation provided under the Special Law must be treated to be different from that under the Limitation Act.

A

Both (A) and (R) are true and (R) is correct explanation of (A)

B

Both (A) and (R) are true but (R) is not correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

In 2017 Australian Open, Serena Williams defeated her sister Venus Williams to win the ______ Grand Slam Singles title of her career.

A

23rd

B

18th

C

26th

D

20th