Plus 2 Lecturer Mixed Practice Test #445

Question 1

An enzyme's activity is highly dependent on its three-dimensional structure. Which of the following factors, if altered significantly, is most likely to cause irreversible denaturation of an enzyme, leading to loss of its catalytic function?

Accepted Answer

C. Extreme temperature changes. — Extreme changes in temperature (or pH) can disrupt the weak bonds maintaining an enzyme's specific three-dimensional structure, leading to irreversible denaturation and loss of function. Substrate concentration changes or competitive inhibitors affect reaction rate but do not typically cause irreversible structural damage to the enzyme itself. Optimal pH adjustment would enhance, not harm, enzyme activity.

Answer

A. Slight increase in substrate concentration.

Answer

B. Optimal pH adjustment.

Answer

D. Presence of a competitive inhibitor.

Question 2

Cataract involves:‌​‍

Accepted Answer

Clouding of the lens — Cataract is opacification of the eye lens, typically age-related; treated by surgical replacement.‌​‍

Answer

Pupil enlargement

Answer

Corneal ulcer

Answer

Detached retina

Question 3

One who walks in sleep:‌​‍

Accepted Answer

Somnambulist — Somnambulist = one who walks in sleep (somnambulism).‌​‍

Answer

Insomniac

Answer

Somnolent

Answer

Narcoleptic

Question 4

Which of the following structures is responsible for preventing the backflow of blood from the right ventricle to the right atrium?

Accepted Answer

B. Tricuspid valve — The tricuspid valve is located between the right atrium and right ventricle and prevents blood from flowing back into the atrium during ventricular contraction. The pulmonary valve (A) prevents backflow from the pulmonary artery to the right ventricle, while the aortic (C) and mitral (D) valves are associated with the left side of the heart.

Answer

A. Pulmonary valve

Answer

C. Aortic valve

Answer

D. Mitral valve

Question 5

Antonym of IMPORT:

Accepted Answer

Export — Import ↔ export.

Answer

Bring in

Answer

Introduce

Answer

Ship in

Question 6

Nitrogen cycle bacteria:

Accepted Answer

Rhizobium, Nitrosomonas — Various nitrogen-fixing/nitrifying bacteria.

Answer

Only Rhizobium

Answer

E. coli

Answer

Staphylococcus

Question 7

Which block of the periodic table does sodium belong to?

Accepted Answer

s-block — Alkali metals (Group 1) are s-block; last electron enters s-orbital.

Answer

p-block

Answer

d-block

Answer

f-block

Question 8

She ___ to school every day.‌​‍

Accepted Answer

goes — Simple Present with third person singular (she) = goes.‌​‍

Answer

go

Answer

going

Answer

gone

Question 9

Kerala Public Library:‌​‍

Accepted Answer

TVM — State Central Library TVM.‌​‍

Answer

Kottayam

Answer

Kochi

Answer

Thrissur

Question 10

SNDP Yogam founded by:

Accepted Answer

Sree Narayana Guru — Sree Narayana Guru founded SNDP Yogam (1903).

Answer

Ayyankali

Answer

Dr. Palpu

Answer

Kumaran Asan

Plus 2 Lecturer Mixed Practice Test #445