NEET Biology - Cell the unit of Life
Exam Duration: 60 Mins Total Questions : 30
Which of the following is not correctly matched?
- (a)
Amyloplast-Store fats
- (b)
Elaioplasts-Store oils
- (c)
Aleuroplasts-Store proteins
- (d)
Chloroplasts-Contain photosynthetic pigments
Sequence of DNA (non-coding) is known as
- (a)
exon
- (b)
intron
- (c)
cistron
- (d)
None of these
Sugars are technically called carbohydrates, referring to the fact that their formulae are only multiple of C(H2O). Hexoses therefore have six carbons, twelve hydrogens and six oxygen atoms. Glucose is a hexose Choose from among the following another hexose.
- (a)
Fructose
- (b)
Erythrose
- (c)
Ribulose
- (d)
Ribose
Select the option which is not correct with respect to enzyme action
- (a)
Substrate binds with enzyme at its active site
- (b)
Addition of lot of succinate does not reverse the inhibition of succinic dehydrgenase by malonate
- (c)
A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate
- (d)
Malonate is a competitive inhibitor of succinic
A cetain species of animals has pairs of chromosomes.how many molecules of DNA do the nuclei of these animals have during G2-phase?
- (a)
12
- (b)
48
- (c)
6
- (d)
24
what is the correct order of the stages of mitosis?
I.Metaphase
II.Telophase
III. Anaphase
IV. Prophase
- (a)
II,III,I,IV
- (b)
I,II,III,IV
- (c)
I,III,II,IV
- (d)
IV,I,III,II
Smooth endoplasmic reticulum is well-developed in the cell, which synthesise
- (a)
steroids
- (b)
proteins
- (c)
carbohydrates
- (d)
All of these
Protein synthesis takes place in
- (a)
ribosomes
- (b)
chloroplasts
- (c)
mitochondria
- (d)
Golgi bodies
Detailed structure of the membrane was studied after the advent of electron microscope duriong
- (a)
1930 s
- (b)
1950 s
- (c)
1970 s
- (d)
1990 S
Catalytic activity of enzymes is influenced by
- (a)
temperature
- (b)
pH and enzyme positions
- (c)
concentration, substrate and cofactors
- (d)
All of the above
Enzymes bringing about hydrolysis of esters and peptides are
- (a)
lyases
- (b)
synthetases
- (c)
hydrolases
- (d)
transferases
Turnover number of an enzyme is dependent upon
- (a)
active sites
- (b)
size of enzyme
- (c)
concentration of substrate
- (d)
molecular weight of enzyme
The sulphur containing amino acid is
- (a)
valine
- (b)
leucine
- (c)
methionine
- (d)
histidine
Among the following, acidic amino acids are
- (a)
glycine and alanine
- (b)
valine and phenylalanine
- (c)
glycine and methionine
- (d)
glutamic acid and aspartic acid
Holoenzyme is
- (a)
non - protein and apoenzyme
- (b)
protein and apoenzyme
- (c)
enzyme protein and coenzyme
- (d)
enzyme non - protein and coenzyme
The leucoplasts that store proteins are called as
- (a)
amyloplasts
- (b)
elaioplasts
- (c)
aleuroplasts
- (d)
carotenoids
Which of the following is likely to show the absence of lysosomes?
- (a)
Cyanophyceae
- (b)
Protozoa
- (c)
Animal cell
- (d)
Mammalian leucocytes
DNA is not present in
- (a)
Mitochondria
- (b)
Chloroplast
- (c)
Ribosomes
- (d)
Nucleus
ATP is a
- (a)
Nucletotide
- (b)
Nucleoside
- (c)
Nucleic acid
- (d)
Vitamin
How many pairs of nucleotides are present in one helix of \(\beta \) DNA?
- (a)
10
- (b)
12
- (c)
5
- (d)
6
Four haploid daughter cells are formed at the end of
- (a)
telophase
- (b)
telophase I
- (c)
meiosismeiosis
- (d)
mitosis
Which one of the following statements about cytochrome 450 is wrong?
- (a)
It contains iron
- (b)
It is a coloured cell
- (c)
It has an important role in metabolism
- (d)
It is an enzyme involved in oxidation reactions
Which is not consistent with double helical structure of DNA?
- (a)
A= T, C==G
- (b)
Density of DNA decreases on heating
- (c)
A + TIC T G is not constant
- (d)
Both (a) and (b)
The given graph shows the change in DNA content during various phases (A to D) in a typical mitotic cell cycle. Identify the phases and select the correct option.
- (a)
A B C D G2 G1 S M - (b)
A B C D G2 S G1 M - (c)
A B C D G1 S G2 M - (d)
A B C D M G1 S G2
If a tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single cell undergone?
- (a)
512
- (b)
10
- (c)
1024
- (d)
256
During meiosis I in humans, one of the daughter cells receives
- (a)
only maternal chromosomes
- (b)
a mixture of maternal and paternal chromosomes
- (c)
same number of chromosomes as present in parent cell
- (d)
none of these.
Assertion: During anaphase, centromere of each chromosome splits and chromatids separate.
Reason: During anaphase, chromatids move to opposite poles.
- (a)
If both assertion and reason are true and reason is the correct explanation of assertion
- (b)
If both assertion and reason are true but reason is not the correct explanation of assertion
- (c)
If assertion is true but reason is false
- (d)
If both assertion and reason are false
If there are 10,000 nitrogenous base pairs in a DNA then how many nucletides are there?
- (a)
500
- (b)
10,000
- (c)
20,000
- (d)
40,000
Tick mark the false statement
- (a)
Artificial silk is a polysaccharide
- (b)
Natural silk is a protein
- (c)
Collagen protein forms intercellular ground substance
- (d)
Plant proteins are first class proteins
The chromosomes align at the equator during
- (a)
Interphase
- (b)
Prophase
- (c)
Metaphase
- (d)
Telophase