Biology/Biology MCQ Question - Chromosome and DNA Sample Test,Sample questions

Question:
A tortion of chromatin that is condensed only during cell division is

1.Euchromatin

2.Heterochromatin

3.Biochromatin

4.Nucleochromatin


Question:
A typical human chromosome contains _________ nucleotides in its DNA

1.240 million

2.140 million

3.150 million

4.160 million


Question:
Acromegaly is caused due to oversecretion of

1.STH

2.TSH

3.ACTH

4.Thyroxin


Question:
All of the following are similarities between nervous and endocrine system except

1.Produce chemical messengers

2.Release chemical messengers in extracellular space

3.Homestatic in function

4.Having slow but prolonged effects


Question:
Central dogma is

1.Transfer of information from DNA to mRNA

2.Basic mechanism of reading and expressing genes

3.Transfer of information from RNA to proteins

4.Synthesis of all three types of RNA


Question:
Chromosome is made of

1.2 chromatids +1 centromere +secondary constriction

2.1 chromated + 1 centromere + primary constriction

3.2 chromatids + 1 centromere + primary constriction

4.2 chromatids + 2 centromere + secondary constriction


Question:
Chromosomes are composed of

1.40% protein and 60% DNA

2.50% protein and 50% DNA

3.70% protein and 30% DNA

4.60% protein and 40% DNA


Question:
DNA contains

1.Purines (A and G) pyrimidines (U and (c)

2.Purines (T and (c) pyrimidines (A and G)

3.Purines (A and (c) pyrimidines (U and G)

4.Purines (A and G) pyrimidines (T and (c)


Question:
DNA has a helical shape with the diameter of

1.3 nm

2.4 nm

3.2 nm

4.5 nm


Question:
Histones have abundance of amino acids

1.Valine and lysine

2.Arginine and lysine

3.Valine and arginine

4.Histidione and threonine


Question:
Human cell contains ______ different kinds of tRNA molecules

1.25

2.35

3.45

4.15


Question:
In DNA

1.A forms two bonds with T

2.G forms three bonds with C

3.A forms three bonds with T

4.Both a and b


Question:
In eukaryotes newly synthesized mRNA

1.Travels a large distance from nucleus to cytoplasm

2.Is directly released into the cytoplasm

3.Contains a cap and tail

4.Both a and c


Question:
In mitochondria UGA is/specifies as

1.Stop codon

2.Tryptophan

3.Initiation codon

4.Methionine


Question:
In prokaryotes there are

1.Three types of DNA polymerases

2.One type of RNA polymerase

3.Three types of RNA polymerase

4.Both a and b


Question:
In semi-conservative replication

1.Sequence of original duplex is conserved after one round of replication

2.Gererate DNA copies of entirely new molecules

3.Parental DNA become completely dispersed

4.Each strand of daughter molecules will be a mixture of old and new


Question:
Initiation complex in translation is composed of

1.Ribosome and aminoacyl-tRNA

2.Ribosome and tRNA

3.tRNA and aminoacyl-tRNA

4.None of these


Question:
Insufficient secretion of iodothyroxine in adults causes

1.Myxedema

2.Cretinism

3.Goiter

4.Exopthalmic goiter


Question:
Insulin and glucagons are ________ in nature.

1.Protein

2.Amino acid derivative

3.Polypeptide

4.Steroid


Question:
Methionine is specified by

1.Stop codon

2.AUG

3.Start codon

4.Both b and c


Question:
Molecular basis of sickle cell anaemia was found by

1.F. Sanger

2.Beadle and Tatum

3.Vernone Ingram

4.Mendal


Question:
MSH is produced from

1.Anterior pituitary

2.Median pituitary

3.Posterior pituitary

4.None of these


Question:
Number of pairs of cranial nerves is

1.10

2.11

3.12

4.13


Question:
Phenylketonuria is due to deficiency of

1.Phenylalnine

2.Phenylalanine hydroxylase

3.Phenylene

4.All of these


Question:
Point mutations are represented as

1.Presence of an extra chromosome

2.Loss of chromosome

3.Alteration in sequence of DNA nucleotide

4.Insertions and inversion of genes


Question:
Rate of DNA replication by DNA polymerase is

1.2000 nucleotides / sec

2.1000 nucleotides / sec

3.150 nucleotides / sec

4.1050 nucleotides / sec


Question:
Receptors for hearing come under heading of

1.Chemical

2.Mechanical

3.Photo

4.Nociceptors


Question:
Secretin is a hormone produced by

1.Stomach

2.Liver

3.Pancreas

4.Duodenum


Question:
Sex chromosomes were 1" discovered in

1.Man

2.Pea plant

3.Fruitfly

4.None of these


Question:
Strand of DNA which is not transcribed is called

1.Antisense

2.Template

3.Coding

4.None of these


Question:
The length of okazaki fragments in eukayotes is

1.150--250 nucleotides long

2.200-300 nucleotides

3.1000-2000 nucleotdes

4.100-200 nucleotides


Question:
The sequence of nucleotides that determines the amino acid sequence of a protein is

1.Chromosome

2.DNA

3.RNA

4.Gene


Question:
The true E.Coli replicating enzyme is

1.DNA polymerase I

2.DNA polymerase II

3.DNA polymerase III

4.All of these


Question:
Three nucleotide sequence on tRNA that specifies an amino acis is

1.Codon

2.Anticodon

3.Nonsense codon

4.Genetic code


Question:
Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called

1.Mutation

2.Transuction

3.Replication

4.Variation


Question:
Types of behaviour enabling pillbugs to reach moist area is

1.Kinesis

2.Taxes

3.Instinct

4.Learning


Question:
Value of resting membrane potential is

1.0.03 V

2.0.05 V

3.0.07 V

4.0.09V


Question:
Which 3 codons are nonsense codons?

1.UAA,UAU,UUA

2.UGA,UAG,UAA

3.UGG,UGA,UAU

4.UGG,UAA,UAG


Question:
Which is incorrect about nucleosome

1.2 turns of DNA coiled round histones

2.8 histones as acidic proteins

3.200 nucleotides in one nucleosome

4.None of these


Question:
Which is incorrect?

1.Chromosomes 1st observed by walther Fleming

2.Chromosomal theory of inheritance 1st formulated by Walter Sutton

3.1st evidence of hereditary nature of DNA provided by Friedrich Meischer

4.Sex chromosomes discovered by Thomas Hunt Morgan


Question:
Which of the following feature is not related to neuron

1.Conduction

2.Regeneration

3.Reflex

4.Movement


Question:
Which statement is correct?

1.Leading strand elongates away from the replication fork

2.Lagging strand elongates towards the replication fork

3.Lagging strand is constructed discontinuously.

4.Both a and b


Question:
Who discovered DNA?

1.P.A.Levene

2.Frederick Griffith

3.Friedrich Miescher

4.Rosalind Franklin


Question:
_______ is simplest form of learning.

1.Imprinting

2.Habituation

3.Insight learning

4.Latent learning


Question:
_________ was first to propose an objective definition of instinct.

1.Thorpe

2.Darwin

3.Pavlov

4.Kohler


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