MCQ Biology - Learning Biology through MCQs

Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Evolution

1. The naturalist who independently conceived the idea of natural selection along with Darwin

A)Alfred Russel Wallace

B) Charles Lyell

C) Joseph Hooker

D) John Henslo


2. The theory proposed by Stephen Jay Gould and Niles Eldredge to explain Evolution

A)Theory of Genetic Equilibrium

B) Theory of Genetic drift

C) Theory of Orthogenesis

D) Theory of punctuated Equilibrium 


3. A system of classification based on the phylogenetic relationships and evolutionary history groups of organisms:

A) Phyletic

B)Cladistics

C) Phenetics

D) Phylogenetics


4. Which of the following fish is considered to be a living fossil

A) Lepidosiren

B) Protopterus

C) Latimeria 

D) Neoceratodus 


5. Protein that was used to create the first phylogenetic tree based on molecular data:

 A) Cytochrome B

 B) Cytochrome A

 C) Cytochrome D

 D) Cytochrome C

6. Both birds and Bats fly and have wings. Wings of birds and bats represent

 A) Analogous structures

 B) Homologous structures

 C) Vestigial structures

 D) Phylogenetically conserved structures


7. The loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population is known as

 A) Genetic stability principle

 B) Hardy Weinberg Principle

 C) Founder Principle

 D) Speciation principle


8. An example of Coevolution is

MCQ ON EVOLUTION

A) Evolution of bees and flowers they pollinate

B)Evolution of horse and deer

C)Evolution of marsupials and placental mammals

D) Evolution of man and ape


9. The finches on the Galapagos Islands have widely differing beaks adapted according to their diets. This is an example of

A) adaptive radiation

B)co-adaptation

C)parallel radiation

D) adaptive convergence


10. Which one of the following is an example of sympatric speciation?

A) Evolution of birds and bats wings

B)Speciation of squirrels separated by a wide river

C)Origin of new species among wasps that pollinate figs
D) Emergence of a new species among finches that mirated to an island and thus isolated from heir ancestors  


Learn more:
Answers:
1. A)Alfred Russel Wallace
2. D) Theory of punctuated Equilibrium
3. B)Cladistics
4. C) Latimeria 
5. D) Cytochrome C
6. A) Analogous structures
7. C) Founder Principle
8. A) Evolution of bees and flowers they pollinate
9. A) adaptive radiation
10. C)Origin of new species among wasps that pollinate figs  
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Multiple Choice on Waxes - Structure and Function

Multiple Choice on Waxes-Structure and Function
 Multiple Choice on Waxes- Structure and Function

1. Waxes are made up of  

a) fatty acid chains esterified to long-chain alcohols.

b) fatty acid chains esterified to glycerol.

c) fatty acid chains esterified to sphingosine.

d) fatty acid chains esterified to carbohydrates.

2. All the statements are true regarding waxes except

a) Waxes are simple lipids

b) hydrophobic and insoluble in water

c) Chemically inert

d) low melting point

3. Beeswax is primarily made up of

a) Myricyl palmitate

b) glycerol

c) Myricyl alcohol

d) palmitate

4. In waxes fatty acids and alcohols are joined by

a)  amide linkage

b) glycosidic linkage

c) ester linkage

d) peptide linkage

5. Sperm whale wax located in the head region of sperm whale is called

a) Carnouba wax

b) Spermaceti wax

c) Ambretolide

d) none of these

6. The fatty acids of Waxes generally have

a) ~4-8 C atoms

b) ~7-14 C atoms

c) ~14-36 C atoms

d) ~2-4 C atoms

7. Spermaceti wax is made up of

a) Myricyl palmitate

b) cetyl palmitate

c) Myricyl alcohol

d) cetyl linolate

8. Waxy coating on leaf and fruits helps plants against

a) Transpiration loss

b) parasites

c) insects

d) all of the above

9. Waxes are the chief energy storage substances in

a) birds

b) plankton

c) fishes

d) whales

10. Which of the following is the hardest natural wax; also known as "queen of waxes"?

a) Carnauba wax (palm wax)

b) Spermaceti

c) Bees wax

d) wax on leaf cuticle

Answers:

1. a) fatty acid chains esterified to long-chain alcohols.

2. d) low melting point

3. a) Myricyl palmitate

4. c) ester linkage

5. b) Spermaceti wax

6. c) ~14-36 C atoms

7. b) cetyl palmitate

8. d) all of the above

9. b) plankton

10. a) Carnauba wax (palm wax)

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Multiple Choice on Glycerolipids-Neutral glycerides and Phospholipids

 1. Which of the following is a glyceride lipid?

a) Phospholipids

b) Fats

c) Oils

d) All of the above

2. All the statements are true regarding glycerolipids except

a) glycerol containing lipids

b) always polar and ionic

c) made up of fatty acids and glycerol

d) glycerolipids include phospholipids and triglycerides

3. All are neutral glycerides except

a) phospholipids

b) fats

c) oils

d) diglycerides

4. Neutral glycerides are

a)  non ionic  

b) non polar

c) not amphipathic

d) all of the above

Multiple Choice on Glycerolipids-Neutral glycerides and Phospholipids

5. Triglyceride is a neutral glyceride made up of

a) 3 fatty acids joined to 1 glycerol by ester linkage

b) 1 fatty acid joined to 3 glycerol by ester linkage

c) 3 fatty acids joined to 1 glycerol by ether linkage

d) 2 fatty acids and 1 phophate joined to 1 glycerol by ester linkage

6. A phospholipid consists of a

a) polar phosphate hydrophilic tail group and hydrophobic fatty acid head

b) non-polar phosphate containing head group and polar fatty acid tail

c) polar phosphate containing hydrophilic head group and hydrophobic fatty acid tail

d) non-polar phosphate containing head group and non-polar fatty acid tail

7. A phospholipid consists of

a) 3 Fatty acid+ 1 Glycerol + phosphate group

b) 2 Fatty acid+ 1 Glycerol + phosphate group + attached alcohol

c) 1 Fatty acid+ 3 Glycerol + phosphate group

d) 2 Fatty acid+ 1 Glycerol + phosphate group

8. Which of the following statement is true regarding phospholipids?

a) attached alcohol can be serine, choline, ethanolamine

b) amphipathic in nature

c) polar and ionic

d) all of the above

9. Which of the following is common to both neutral glycerides and Phosphoglycerides

a) Glycerol backbone

b) side chain is alcohol

c) phosphate

d) All of the above

10. All are functions of phospholipids except

a) forms cell membranes

b) Major role in assembling and transporting lipoproteins in blood

c) It work as emulsifiers in the body

d) Provides energy

 Learn more: MCQ on Biochemistry, MCQ on Lipid 

Answers:

1. d) All of the above

2. b) always polar and ionic

3. a) phospholipids

4. d) all of the above

5. a) 3 fatty acids joined to 1 glycerol by ester linkage

6. c) polar phosphate containing hydrophilic head group and hydrophobic fatty acid tail

7. b) 2 Fatty acid+ 1 Glycerol + phosphate group + attached alcohol

8. d) all of the above

9. a) Glycerol backbone

10. d) Provides energy

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Multiple Choice Questions on Genetics

Multiple Choice Questions on Genetics


1.  First eukaryotic genome sequenced was that of

A) Haemophilus influenzae  B) Caenorhabditis elegans

C) Neurospora crassa   D)Saccharomyces cerevisiae

2. DNA and RNA differ in
A) Sugar only
B) Sugar and purines
C) Sugar and pyrimidines
D) Sugar and phosphate

3. If the GC content of a DNA molecule is 52%, what are the percentage of the four bases in the DNA molecule?
A) G 32% C 20% T 20% A 28%

B) G 20% C 20% T 24% A 24%

C) G 26% C 26% T 24% A 24%

D) G 25% C 26% T 24% A 24%

4. A polyploidy which contains genomes all the same species is called
A) Allopolypoid  
B) Amphidiploid  C) Aneuploid  D)  Autopolyploid

5. A homozyogous plant having red flowers is crossed with a homozygous plant bearing white flowers, the offspring are:

A) All with red flowers B) all with white flowers 

c) Half with white flowers d) Half with red flowers   

6. Mutation theory of evolution was proposed by

A) De Vries  B) Darwin C) Weismann  D) Lamarck

7. Genes that occur only in Y chromosome are called

A) Lethal genes  B) plasma genes C) Holandric genes D) Duplicate genes


8. Eukaryotic and Prokaryotic genome differs by having:
A) DNA is circular and single stranded in prokaryotes

B) DNA is complexed with histone in prokaryotes

C) Repetitive sequences are present in eukaryotes

D) Genes in the former case are organized into operons


9. When a gene exists in more than two alleic forms, the phenomenon is called

A) polygenes B) Multiple allelism C) Pleiotropism D) Multiple genes

10. A short length of DNA molecule contains 120 adenine and 120 Cytosine bases. The total number of nucleotide in this DNA segment is:

A) 480 B) 240 C) 120 D) 60

Learn more:

1. D)Saccharomyces cerevisiae

2. C) Sugar and pyrimidines

3. C) G 26% C 26% T 24% A 24%

4. D)  Autopolyploid

5. A) All with red flowers

6. A) De Vries

7. C) Holandric genes

8. C) Repetitive sequences are present in eukaryotes

9. B) Multiple allelism

10. A) 480

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MCQ on Food Chemistry and Nutrition

1. The important role of carotenoids in the human diet is their ability to serve as precursors of

A) Vitamin A

B) Vitamin D

C) Vitamin C

D) Vitamin K

2. Which of the following carbohydrates is not classified as dietary fiber?

A) Agar

B) Pectin

C) Sodium alginate

D) Tapioca starch

3. Among the following animal foods, the fat content is least in

A) beef

B) pork

C) lamb flesh

D) chicken meat

MCQ on Food Chemistry and Nutrition

4. Which of the following is an oil soluble pigment present in fruits and vegetables?

A) Flavonoids

B) Tannins

C) Carotenoids

D) Anthocyanins

5. The anti-nutritional factor present in fava bean is

A) gossypol

B) curcine

C) cyanogen

D) vicine

6. Which of the following represent the group of saturated fatty acids?

A) Palmitic, Linoleic, Linolenic

B) Behenic, Caprylic, Arachidonic

C) Capric, Stearic, Oleic

D) Lauric, Myristic, Arachidic

7. The enzyme majorly involved in postmortem degradation of muscle protein is

A) trypsin

B) pepsin

C) calpin

D) transglutaminase

8. Which of the following is the correct pair of essential fatty acids?

 A) Linolenic acid and Oleic acid

B) Lenoleic acid and Linolenic acid

C) Linolenic acid and Laurie acid

D) Oleic acids and Lenoleic acid

9. The enzyme system used for removal of glucose from egg white prior to its drying consists of

A) glucoisomerase and catalase

B) glucosidase and glucoisomerase

C) glucose oxidase and catalase

D) Glucoamylase and glucose oxidase 

10. Rigor mortis is caused due to

A) breakage of rigid protein molecules in sarcoplasm

B) decrease in body temperature

C) unavailability of ATP which is necessary to break the link between actin and myosin 

D) rupturing of tissue due to unavailability of oxygen

 Learn more: MCQ on Food Technology 

Answers:

1. A) Vitamin A
2. 
D) Tapioca starch
3. 
D) chicken meat
4. 
C) Carotenoids
5. 
D) vicine
6. 
D) Lauric, Myristic, Arachidic
7. 
C) calpin
8. 
B) Lenoleic acid and Linolenic acid
9. 
C) glucose oxidase and catalase
10. 
C) unavailability of ATP which is necessary to break the link between actin and myosin 

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Multiple Choice Questions on Food Microbiology

1.  Thermal destruction of microorganisms follows the kinetics of

A) Zero order

B) First order

C) Second order

D) Fractional order

2. Which one of the following micro-organism is used in the preparation of bread?

A) Candida utilis

B) Aspergillus niger

C) Saccharomyces cerevisiae

D) Saccharomyces cevarum

MCQ ON FOOD TECHNOLOGY- FOOD MICROBIOLOGY

3. Which one of the microorganisms given below is not responsible for ropy or stingy fermentation of milk?

A) Alcaligenes viscolactis

B) Enterobacter aerogenes

C) Streptococcus cremoris

D) Streptococcus lactis

4.Which of the following is a Gram Positive bacterium?
A) Listeria monocytogenes

B) Proteus vulagaris

C) Salmonella typhi

D) Shigella dysenteriae

5. Nisin A produced by

A) Apergillus niger

B) Acetobacter aceti

C) Lactobacillus lactis

D) Clostridium perfringens

6. Which of the following bacteria will stain purple color after Gram staining?

A) Bacillus subtilis

B) E coli

C) Yersinia pestis

D) Pseudomonas aeruginosa

7. The incorrect pair of food borne illness and its causative microorganism is

A) brucellosis – Brucella sp

B) Peptic ulcers – Bacillus subtitles

C) Bubonic plague – Yersinia pestis

D) Q fever – Coxiella burnetti

8. In dye reduction test estimation of viable microorganisms, the most commonly used dyes are methylene blue, triphenyltetrazolium chloride and -----

A) malachite green

B) amaranth

C) tetrazine

D) resazurin

9. The primary bacterial spoilage of poultry meat at low temperature, with characteristic sliminess at the outer surface, is caused by

A) Pseudomonas spp

B) Aspergillus spp

C) Bacillus spp

D) Candida spp

10. The steps followed in Gram’s staining of micro organisms are:

P. Washing with neutral organic solvent

Q. counter staining with a contrast dye

R. staining with basic dye

S. fixing the color with a suitable mordant

Identify the correct sequence.

A) Q-> S -> R-> P

B) Q-> P -> S-> R

C) R-> S -> P-> Q

D) P-> Q -> R-> S

Learn more: MCQ on Food Technology


Answers

1. B) First order

2. C) Saccharomyces cerevisiae

3. D) Streptococcus lactis

4. A) Listeria monocytogenes

5. C) Lactobacillus lactis

6. A) Bacillus subtilis

7. B) Peptic ulcers – Bacillus subtitles

8. D) resazurin

9. A) Pseudomonas spp

10. C) R-> S -> P-> Q

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