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Engineering Entrance Exam
OTI365 - IISER
IISER Biology - Cell the unit of life Important Questions

Biology - Cell the unit of life

Exam Duration: 45 Mins Total Questions : 30

1 )

Physicists have defined a formal measure of disorder, called

(a)
randomness
(b)
displacement
(c)
entropy
(d)
disorganisation

2 )

If we separate the cell organelles of a living cell, which part should be alive?

(a)
Endoplasmic reticulum
(b)
Chloroplast
(c)
Cell wall
(d)
Ribosomes

3 )

On boiling/treating with strong acid or alkali/treating with pepsin, an enzyme loses its catalytic activity because

(a)
it is a protein
(b)
it burns
(c)
it is a functional substance
(d)
it is a lipoprotein

4 )

Choose the incorrect statement about carbohydrates.

(a)
The general formula is C_nH_2nO_n
(b)
Glucose is the most important monomer of carbohydrates
(c)
Fructose is sweetest of all sugars
(d)
Carbohydrates do not conjugate with lipids

5 )

Transition state structure of the substrate formed during an enzymatic reaction is

(a)
transient but stable
(b)
permanent but unstable
(c)
transient and unstable
(d)
permanent and stable

6 )

Movement of chiasma at the end of the chromosomes in prophase I

(a)
is called terminialisation
(b)
occur in diakinesis
(c)
Both a and b
(d)
occur in zygotene

7 )

Fluid mosaic model of cell membrane proposed

(a)
A lipid bilayer with embedded proteins only
(b)
A lipid bilayer with proteins on the outer surface only
(c)
A lipid bilayer coated with proteins on both the surfaces
(d)
A lipid bilayer with proteins of two types,embedded (intrinsic) and superficial (extrinsic)

8 )

The 80S ribosomes are present in

(a)
eukaryotic cells
(b)
prokaryotic cells
(c)
bacterial cells
(d)
cyanobacterial cells

9 )

Which of the following is seen only in prokaryotic cells?

(a)
Dictyosome
(b)
Ribosome
(c)
Endoplasmic Reticulum
(d)
Mesosome

10 )

The mineral present in cell wall is

(a)
Na
(b)
Ca
(c)
K
(d)
Mg

11 )

Twenty carbon atoms are found in

(a)
palmittic acid
(b)
Arachidonic acid
(c)
patty acids
(d)
Glycerol

12 )

The buiding blocks of protein are

(a)
glucose
(b)
amino acids
(c)
fatty acids
(d)
glycerol

13 )

Mast of the blood proteins in our body are

(a)
Basic
(b)
Acidic
(c)
Neutral
(d)
Basic and Neutral

14 )

Which vitamin should not be stored?

(a)
Calciferol
(b)
Retinol
(c)
Niacin
(d)
Ascorbic acid

15 )

In meiosis, the reduction in the number of chromosomes occurs during

(a)
anaphase I
(b)
anaphase II
(c)
prophase I
(d)
metaphase II

16 )

In 'S' phase of the cell cycle

(a)
Amount of DNA doubles in each cell
(b)
Amount of DNA remains same in each cell
(c)
Chromosome number is increased
(d)
Amount of DNA is reduced to half in each cell

17 )

A polysaccharide, which is synthesised and stored in liver cells is

(a)
lactose
(b)
galactose
(c)
arabinose
(d)
glycogen

18 )

Which of the following occurs more than one and less than five in a chromosome?

(a)
Chromatid
(b)
Chromosome
(c)
Centromere
(d)
Telomere

19 )

Meiosis-I is reductional division. Meiosis-IT is equational division due to

(a)
pairing of homologous chromosomes
(b)
crossing over
(c)
separation of chromatids
(d)
disjunction of homologous chromosomes

20 )

Given molecular formula belongs to which of the following groups of biomolecules?

(a)
Carbohydrates
(b)
Proteins
(c)
Nucleic acids
(d)
Triglycerides

21 )

What is true about telophase stage of mitosis?

(a)
Chromosomeslosetheir identity as discrete elements
(b)
Chromosomes cluster at opposite spindle poles
(c)
Nuclear envelope, nucleolus, Golgi complex and ER reform.
(d)
All of these

22 )

What is denoted by X and Y in the given graph?

(a)

X Y

Activation energy without enzyme Activation energy with enzyme
(b)

X Y

Activation energy with enzyme Activation energy without enzyme
(c)

X Y

Substrate concentration with enzyme Substrate concentration without enzyme
(d)

X Y

Substrate concentration without enzyme Substrate concentration with enzyme