R4RIN – MCQs, Mock Tests | Aptitude Aptitude Mcq Questions Enzymes

Which of the following is the empirical formula of chlorophyll b?

1. C55H70O5N4Mg
2. C55H72O6N4Mg
3. C55H70O6N4Mg
4. C55H72O5N4Mg

✅ Correct Answer: 3

How many moles of carbon dioxide are produced by complete oxidation of one mole of puruvic acid?

1. 1
2. 2
3. 3
4. 6

✅ Correct Answer: 3

The food of hydra consists of

1. Humus
2. Detritus
3. Dead microscopic animals
4. Small crustaceans

✅ Correct Answer: 4

Hunger pangs usually begin ______ after the previous meal.

1. 2-4 hours
2. 6-8 hours
3. 10-12 hours
4. 12-24 hours

✅ Correct Answer: 4

If a plasmolysed plant cell is placed in water the cell will

1. Burst
2. Be Killed
3. Be deplasmolysed
4. Show no change in it

✅ Correct Answer: 3

The major constituent of blood plasma is

1. Protein
2. NaCl
3. Water
4. Cholesterol

✅ Correct Answer: 3

All of the following veins carry deoxygenated blood except

1. Superior vena cava
2. Inferior vena cava
3. Hepatic vein
4. Pulmonary vein

✅ Correct Answer: 2

The windpipe or trachea lies

1. Dorsal to oesophagus
2. Ventral to oesophagus
3. Lateral to oesophagus
4. None of these

✅ Correct Answer: 4

Scurvy and beri - beri and caused by the deficiency of

1. Vitamin B and C
2. Vitamin B and D
3. Vitamin C and B
4. Vitamin A and B

✅ Correct Answer: 3

Kangaroo rat most probably would be found in

1. Tropical rain forest
2. Tundra
3. Grass land
4. Desert

✅ Correct Answer: 4

The greatest diversity of animals in the lake is found in which one of the following zones?

1. Limmnetic zone
2. Littoral zone
3. Profundal zone
4. None of these

✅ Correct Answer: 2

What is the characteristic feature of consumers?

1. Autotroph
2. Heterotroph
3. Parasite
4. Saprophyte

✅ Correct Answer: 2

What percentage of light reaching the earth is used in photosynthesis?

1. 25%
2. 10%
3. 5%
4. 1%

✅ Correct Answer: 4

All of the following are involved in nitrification except

1. Nitrobacter
2. Nitrosomonas
3. Rhizohium
4. All of these

✅ Correct Answer: 3

Competition between species will be greatest if they attempt to occupy the same

1. Ecosystem
2. Community
3. Habitat
4. Niche

✅ Correct Answer: 4

In most ecosystems the greatest amount of energy flows through the

1. Secondary consumers
2. Herbivores
3. Carnivores
4. Decomposers

✅ Correct Answer: 2

Which of the following relationship is NOT an example of symbiosis?

1. Rhizobium and leguminous plants
2. Marchantia sporophyte and gametophyte
3. Algae and fungi in a lichen
4. Mycorrhizal fungi and tree roots

✅ Correct Answer: 2

Animals with greatest number of similarities are grouped together in a/an

1. Phylum
2. Family
3. Genus
4. Order

✅ Correct Answer: 3

The one which is present in all aerobic species

1. Cytohrome c
2. Cytochrome a
3. Cytochrome a3
4. Cytochrome b

✅ Correct Answer: 1

The structure which has been formed or modified from gill pouches in humans is

1. Gills
2. Eustachian tube
3. Middle ear
4. Lungs

✅ Correct Answer: 2

The first eukarotes appeared about ______ years ago

1. 1.5 billion
2. 2.5 billion
3. 3.5 billion
4. 4.5 billion

✅ Correct Answer: 1

According to Lamarch evolution occurred as the result of

1. Natural selection
2. The theory of recapitulation
3. Inheritance of acquired characters
4. Over production

✅ Correct Answer: 3

The discease in which transmembrane carrier for the chloride ion is not produced is

1. Hyperchloesterolemia
2. Cystic fibrosis
3. Severe combined immunodeficiency syndrome
4. AIDS

✅ Correct Answer: 2

The one which can break open a plasmid ring is

1. Ligase enzyme
2. Primase enzyme
3. Restriction endonuclease
4. ATP-ase enzyme

✅ Correct Answer: 1

A genome is

1. Appearance of an individual
2. Genetic basis of few characters
3. Full set of genes of an individual
4. All of these

✅ Correct Answer: 3

Genes will not be found in gene pairs in the

1. Muscle cell of worm
2. Uterine cells of dog
3. Sperm cells of frog
4. Guard cells of leaf

✅ Correct Answer: 3

The red green colour blindness is sex linked recessive condition in man. A father with normal vision and a color blind mother world expect to produce.

1. Color blind sons and daughter with normal vision
2. Sons with normal vision and color blind daughters
3. Color blind sons colour blind daughters and daughters with normal vision
4. Sons with normal vision colour blind daughter and daughters with normal vision

✅ Correct Answer: 1

Which one of the following stage preceeds mitosis during cell cycle?

1. G1 phase
2. S phase
3. G2 phase
4. M phase

✅ Correct Answer: 3

Which one of the following syndrome is the result of meiotic non dysjunction?

1. Klinefelters syndrome
2. Turners syndrome
3. Downs syndrome
4. All of these

✅ Correct Answer: 4

Which one of the following is correct sequence of stages of prophase 1 of meiosis

1. Diakinesis diplotene pachytene leptotene zygotene
2. Zygotene leptotene pachytene diplotene diakinesis
3. Leptotene zygotene pachytene diplotene diakinesis
4. Pachytene leptotene diplotene zygotene diakinesis

✅ Correct Answer: 3

In humans the number of tetrads formed during mitosis is

1. 23
2. 46
3. 0
4. 1

✅ Correct Answer: 3

The sequence of 3 bases on tRNA which is complementary to condon of mRNA is called

1. Gene
2. Anticodon
3. Code
4. Codon

✅ Correct Answer: 2

Which statement correctly describes the transcription of DNA?

1. It produces another DNA molecule
2. It produces mRNA
3. It is a semi conservation process
4. It occurs at surface of ribosomes

✅ Correct Answer: 2

The basic structural unit of a chromosome is

1. The centromere
2. Nuceleosome
3. Telomere
4. Histone

✅ Correct Answer: 2

The first stage of development in which a cavity appears is the

1. Neurula
2. Morula
3. Gastrula
4. Balastula

✅ Correct Answer: 4

Exposure to low temperature stimulates plants to flower. This is called

1. Photoperiodism
2. Thermotropism
3. Vernalisation
4. Thermoregulation

✅ Correct Answer: 3

The cells present in testes and secrete testosterone are

1. Sertoli cells
2. Germinal cell
3. Interstitial cells
4. Spermatocyte

✅ Correct Answer: 3

The type of learning in which there is loss or decrease in response to repeated stimuli

1. Imprinting
2. Habituation
3. Latent learning
4. Insight learning

✅ Correct Answer: 2

The one which causes contraction of wall of the uterus during and after birth

1. ADH
2. MSH
3. Oxytocin
4. Progesterone

✅ Correct Answer: 3

The one which is a weed killer

1. IAA
2. NAA
3. 2 4-D
4. GA

✅ Correct Answer: 3

Sleep movements are a type of

1. Turgor movements
2. Growth movements
3. Tactic movements
4. Paratonic movments

✅ Correct Answer: 1

The one that stores calcium

1. Sarcolemma
2. Sarcoplasm
3. Sarcoplasmic reticulum
4. Cytosol

✅ Correct Answer: 3

Which one of the following is most likely to occur in an animal during winter?

1. Activation of sweat glands
2. Dilation of skin blood vessels
3. Panting
4. Thermogenesis

✅ Correct Answer: 4

Sebum produced from sebaceous glands in a mammal helps in

1. Protection against micro organisms
2. Temperature regulation
3. Excretion
4. All of these

✅ Correct Answer: 1

Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called

1. Cofactor
2. Coenzymes
3. Activator
4. Enzymes

✅ Correct Answer: 4

Which statement about enzyme is incorrect:

1. Some of them consist solely of protein with no non protein part.
2. They catalyze a chemical reaction without being utilized.
3. All enzymes are fibrous Proteins.
4. They without their cofactor are called apoenzyme

✅ Correct Answer: 3

In which of the following location enzymes controlling cellular respiration are present?

1. Nucleus
2. Chlorophast
3. Milochondria
4. Ribosome

✅ Correct Answer: 3

An activated enzyme consisting of polypeptide chain and a cofactor is called:

1. Apoenzyme
2. Holoenzyme
3. Activated enzyme
4. Both b and c

✅ Correct Answer: 4

Which one forms the raw material for coenzymes?

1. Vitamins
2. Carbohydrates
3. Proteins
4. Metals

✅ Correct Answer: 1

A cofactor made of inorganic ion which is detachable is called

1. Prosthetic group
2. Coenzyme
3. Activator
4. Cofactor

✅ Correct Answer: 3