Biology MCQ Quiz Hub

1. Receptors for hearing come under heading of
Chemical
Mechanical
Photo
Nociceptors

2. Which of the following feature is not related to neuron
Conduction
Regeneration
Reflex
Movement

3. Value of resting membrane potential is
0.03 V
0.05 V
0.07 V
0.09V

4. Number of pairs of cranial nerves is
10
11
12
13

5. Insufficient secretion of iodothyroxine in adults causes
Myxedema
Cretinism
Goiter
Exopthalmic goiter

6. Insulin and glucagons are ________ in nature.
Protein
Amino acid derivative
Polypeptide
Steroid

7. Acromegaly is caused due to oversecretion of
STH
TSH
ACTH
Thyroxin

8. MSH is produced from
Anterior pituitary
Median pituitary
Posterior pituitary
None of these

9. Secretin is a hormone produced by
Stomach
Liver
Pancreas
Duodenum

10. All of the following are similarities between nervous and endocrine system except
Produce chemical messengers
Release chemical messengers in extracellular space
Homestatic in function
Having slow but prolonged effects

11. Types of behaviour enabling pillbugs to reach moist area is
Kinesis
Taxes
Instinct
Learning

12. _________ was first to propose an objective definition of instinct.
Thorpe
Darwin
Pavlov
Kohler

13. _______ is simplest form of learning.
Imprinting
Habituation
Insight learning
Latent learning

14. Which is incorrect?
Chromosomes 1st observed by walther Fleming
Chromosomal theory of inheritance 1st formulated by Walter Sutton
1st evidence of hereditary nature of DNA provided by Friedrich Meischer
Sex chromosomes discovered by Thomas Hunt Morgan

15. Chromosome is made of
2 chromatids +1 centromere +secondary constriction
1 chromated + 1 centromere + primary constriction
2 chromatids + 1 centromere + primary constriction
2 chromatids + 2 centromere + secondary constriction

16. Chromosomes are composed of
40% protein and 60% DNA
50% protein and 50% DNA
70% protein and 30% DNA
60% protein and 40% DNA

17. A typical human chromosome contains _________ nucleotides in its DNA
240 million
140 million
150 million
160 million

18. Histones have abundance of amino acids
Valine and lysine
Arginine and lysine
Valine and arginine
Histidione and threonine

19. A tortion of chromatin that is condensed only during cell division is
Euchromatin
Heterochromatin
Biochromatin
Nucleochromatin

20. Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called
Mutation
Transuction
Replication
Variation

21. Who discovered DNA?
P.A.Levene
Frederick Griffith
Friedrich Miescher
Rosalind Franklin

22. DNA contains
Purines (A and G) pyrimidines (U and (c)
Purines (T and (c) pyrimidines (A and G)
Purines (A and (c) pyrimidines (U and G)
Purines (A and G) pyrimidines (T and (c)

23. In DNA
A forms two bonds with T
G forms three bonds with C
A forms three bonds with T
Both a and b

24. DNA has a helical shape with the diameter of
3 nm
4 nm
2 nm
5 nm

25. In semi-conservative replication
Sequence of original duplex is conserved after one round of replication
Gererate DNA copies of entirely new molecules
Parental DNA become completely dispersed
Each strand of daughter molecules will be a mixture of old and new

26. The true E.Coli replicating enzyme is
DNA polymerase I
DNA polymerase II
DNA polymerase III
All of these

27. Rate of DNA replication by DNA polymerase is
2000 nucleotides / sec
1000 nucleotides / sec
150 nucleotides / sec
1050 nucleotides / sec

28. Which statement is correct?
Leading strand elongates away from the replication fork
Lagging strand elongates towards the replication fork
Lagging strand is constructed discontinuously.
Both a and b

29. The length of okazaki fragments in eukayotes is
150--250 nucleotides long
200-300 nucleotides
1000-2000 nucleotdes
100-200 nucleotides

30. The sequence of nucleotides that determines the amino acid sequence of a protein is
Chromosome
DNA
RNA
Gene

31. Central dogma is
Transfer of information from DNA to mRNA
Basic mechanism of reading and expressing genes
Transfer of information from RNA to proteins
Synthesis of all three types of RNA

32. In prokaryotes there are
Three types of DNA polymerases
One type of RNA polymerase
Three types of RNA polymerase
Both a and b

33. Human cell contains ______ different kinds of tRNA molecules
25
35
45
15

34. In eukaryotes newly synthesized mRNA
Travels a large distance from nucleus to cytoplasm
Is directly released into the cytoplasm
Contains a cap and tail
Both a and c

35. Which 3 codons are nonsense codons?
UAA,UAU,UUA
UGA,UAG,UAA
UGG,UGA,UAU
UGG,UAA,UAG

36. Methionine is specified by
Stop codon
AUG
Start codon
Both b and c

37. In mitochondria UGA is/specifies as
Stop codon
Tryptophan
Initiation codon
Methionine

38. Three nucleotide sequence on tRNA that specifies an amino acis is
Codon
Anticodon
Nonsense codon
Genetic code

39. Initiation complex in translation is composed of
Ribosome and aminoacyl-tRNA
Ribosome and tRNA
tRNA and aminoacyl-tRNA
None of these

40. Point mutations are represented as
Presence of an extra chromosome
Loss of chromosome
Alteration in sequence of DNA nucleotide
Insertions and inversion of genes

41. Strand of DNA which is not transcribed is called
Antisense
Template
Coding
None of these

42. Phenylketonuria is due to deficiency of
Phenylalnine
Phenylalanine hydroxylase
Phenylene
All of these

43. Molecular basis of sickle cell anaemia was found by
F. Sanger
Beadle and Tatum
Vernone Ingram
Mendal

44. Which is incorrect about nucleosome
2 turns of DNA coiled round histones
8 histones as acidic proteins
200 nucleotides in one nucleosome
None of these

45. Sex chromosomes were 1" discovered in
Man
Pea plant
Fruitfly
None of these