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With reference to enzymes, which one of the following statements is true?
Biology Zoology Class 11th NEET UG NEET UG Preparation
Q. 14 of Quiz-1447 (Que-ID : 3157)
With reference to enzymes, which one of the following statements is true?
- Apoenzyme = Holoenzyme + Coenzyme
- Coenzyme = Apoenzyme + Holoenzyme
- Holoenzyme = Apoenzyme + Coenzyme
- Holoenzyme = Coenzyme – Apoenzyme
Ans → (b)Coenzyme = Apoenzyme + Holoenzyme
Explanation → Holoenzyme = Apoenzyme + Coenzyme
This question is taken from this post → Biomolecules : Biology Revision Test (Class 11th) | MCQs for NEET - attemp/practice
More MCQs in - Biomolecules : Biology Revision Test (Class 11th) | MCQs for NEET
Q. 1 of Quiz-1447 (Que-ID : 3144)
Feedback inhibition of enzymes is affected by which of the following
- enzyme
- substrate
- end products
- intermediate end products
Q. 2 of Quiz-1447 (Que-ID : 3145)
An example of competitive inhibition of an enzyme is the inhibition of
- succinic dehydrogenase by malonic acid
- cytochrome oxidase by cyanide
- hexokinase by glucose-6-phosphate
- carbonic anhydrase by carbon dioxide
Q. 3 of Quiz-1447 (Que-ID : 3146)
Insulin is made up of _______ and _______.
- glucose and fructose
- glucose and fructose
- fructose and mannose
- mannose and glucose
Q. 4 of Quiz-1447 (Que-ID : 3147)
Enzymes increase the rate of reaction by
- lowering activation energy
- increasing activation energy
- increasing temperature and pH
- decreasing temperature and pH
Q. 5 of Quiz-1447 (Que-ID : 3148)
Which of the following statements regarding enzyme inhibition is correct?
- Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
- Non-competitive inhibitors often bind to the enzyme irreversibly
- Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
- Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
Q. 6 of Quiz-1447 (Que-ID : 3149)
Which of the following is not a pyrimidine?
- Uracil
- Cytosine
- Guanine
- Thymine
Q. 7 of Quiz-1447 (Que-ID : 3150)
Hydrolysis of starch occurs with the help of
- Peptidase
- Amylase
- Sucrose
- Lipase
Q. 8 of Quiz-1447 (Que-ID : 3151)
Assertion: Arachidic acid is an unsaturated fatty acid Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids
- Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
- Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion
- Assertion is true, but Reason is false.
- Both Assertion and Reason are false
Q. 9 of Quiz-1447 (Que-ID : 3152)
Which of the following influence feedback inhibition of enzyme?
- End product
- External factors
- Enzyme
- Substrate
Q. 10 of Quiz-1447 (Que-ID : 3153)
Which of the following is not a polysaccharide?
- Lactose
- Starch
- Glycogen
- Dextrin
Q. 11 of Quiz-1447 (Que-ID : 3154)
Inulin is made up of _______ and _______
- glucose and fructose
- glucose and fructose
- fructose and mannose
- mannose and glucose
Q. 12 of Quiz-1447 (Que-ID : 3155)
A protein having both structural and enzymatic traits is
- Collagen
- Trypsin
- Myosin
- Actin
Q. 14 of Quiz-1447 (Que-ID : 3157)
With reference to enzymes, which one of the following statements is true?
- Apoenzyme = Holoenzyme + Coenzyme
- Coenzyme = Apoenzyme + Holoenzyme
- Holoenzyme = Apoenzyme + Coenzyme
- Holoenzyme = Coenzyme – Apoenzyme
Q. 15 of Quiz-1447 (Que-ID : 3158)
Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of
- allosteric inhibition
- feedback inhibition
- uncompetitive inhibition
- competitive inhibition
Q. 16 of Quiz-1447 (Que-ID : 3159)
The fastest enzyme known is
- DNA polymerase
- carbonic anhydrase
- carbonic dehydrogenase
- DNA ligase
Q. 18 of Quiz-1447 (Que-ID : 3161)
The minimum amount of energy required to initiate a chemical reaction is called
- enzymatic energy
- activation energy
- substrate energy
- initiation energy
Q. 19 of Quiz-1447 (Que-ID : 3162)
Enzymes, vitamins and hormones are common in
- Enhancing oxidative metabolism
- Being synthesised in the body of organisms
- Being proteinaceous
- Regulating metabolism
Q. 20 of Quiz-1447 (Que-ID : 3163)
Nitrogenous bases present in DNA
- Adenine, guanine, cytosine, uracil
- Adenine, guanine, cytosine, thymine
- Adenine, thymine, uracil
- Guanine, uracil
Q. 21 of Quiz-1447 (Que-ID : 3164)
Metabolic intermediates found in living system which are essential for growth and life is called___________
- Saponins
- Tannins
- Secondary metabolite
- Primary metabolites
Q. 22 of Quiz-1447 (Que-ID : 3165)
Enormous diversity of protein molecules is due to
- R groups of amino acids
- Sequence of amino acids
- Peptide bonds
- Amino groups of amino acids
Q. 23 of Quiz-1447 (Que-ID : 3166)
Anti-parallel strands of a DNA molecule mean that
- One strand turns anticlockwise
- Phosphate groups at the start of two DNA strands (poles) are in opposite position
- Phosphate groups of two DNA strands at their ends share the same position
- One strand turns clockwise
Q. 24 of Quiz-1447 (Que-ID : 3167)
The introduction of t-DNA into plants involves
- Altering the pH of the soil, then heat shocking the plants
- Exposing the plants to cold for a brief period
- Allowing the plant roots to stand in water
- Infection of the plant by Agrobacterium tumefaciens
Q. 25 of Quiz-1447 (Que-ID : 3168)
The most common monomer of carbohydrates is
- Sucrose
- Fructose
- Maltose
- Glucose
More MCQs In - Biology Zoology Class 11th NEET UG NEET UG Preparation
Q. 23 of Quiz- (Que-ID : 2916)
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called
- spermiogenesis
- spermatogenesis
- spermatocytogenesis
- spermiation
Q. 21 of Quiz- (Que-ID : 3489)
In the phosphorus cycle, weathring makes phosophate available first to
- Producers
- Decomposers
- Consumers
- None of these
Q. 14 of Quiz- (Que-ID : 3432)
From which one of the following plants, the insecticide pyrethrum is prepared.
- Cymohopogen
- Tephrosia
- Crysanthemum
- Vitivera
Q. 20 of Quiz- (Que-ID : 2713)
Length of which band get reduced during contraction
- A band
- I band
- Z line
- C band
Q. 5 of Quiz- (Que-ID : 2723)
What is the purpose of taxonomy
- Explain the origin of life
- Identification of unknown species
- To search history of evolution
- Identify medicinal plants
Q. 6 of Quiz- (Que-ID : 2649)
Inspiration occurs if the pressure within the lungs is
- More than atm pressure
- Less tha atm pressure
- Equal to atm pressure
- None of the above
Q. 14 of Quiz- (Que-ID : 3207)
Fusifrom initial cells of cambium from
- vascular rays
- tracheary elements
- ray parenchyma
- phloem parenchyma
Q. 10 of Quiz- (Que-ID : 3228)
In which of the following plants stems do not store the food materia
- potato
- ginger
- onion
- colocasia
Q. 2 of Quiz- (Que-ID : 3370)
Which of the following is not used as a biopesticide ?
- Trichoderma harzianum
- Nucleopolyhedrovirus
- Xanthomonas campestris
- Bacillus thuringiensis
Q. 24 of Quiz- (Que-ID : 3217)
Which of the following provide maximum mechanical strength to a tree trunk.
- Heart wood
- Sap wood
- Cork
- Late wood
Q. 3 of Quiz- (Que-ID : 3471)
Plant roots soil water is
- Cellular water
- Surface water
- Humidity water
- Gravitational water
Q. 9 of Quiz- (Que-ID : 3152)
Which of the following influence feedback inhibition of enzyme?
- End product
- External factors
- Enzyme
- Substrate
Q. 3 of Quiz- (Que-ID : 3196)
Which of the following is not a feature of spring wood?
- Color of the wood is light.
- Density is less.
- Cambium is active.
- Lesser number of xylary elements.
Q. 23 of Quiz- (Que-ID : 3516)
The worst dangerous threat to wild life is by
- Habitat destruction
- Hunting
- Overgrazing
- Exotic species
Q. 21 of Quiz- (Que-ID : 3947)
Metabolic intermediates found in living system which are essential for growth and life is called___________
- Saponins
- Tannins
- Secondary metabolite
- Primary metabolites
Q. 19 of Quiz- (Que-ID : 3037)
Cavity formed between somatic and splanchnic mesoderm is called
- Gastrocoele
- Blastocoele
- Coelom
- Neurocoele
Q. 12 of Quiz- (Que-ID : 3305)
Single step large mutation leading to speciation is also called
- founder effect
- saltation
- branching descent
- natural selection
Q. 20 of Quiz- (Que-ID : 3263)
Order Rhynchocephalia consists of
- Tuataras
- Lizards and snakes
- Turtles and tortoises
- Crocodiles, alligators, caimans
Q. 24 of Quiz- (Que-ID : 2842)
Oestrous cycle is reported in
- cows and sheep
- humans and monkeys
- chimpanzees and gorillas
- none of these.
Q. 20 of Quiz- (Que-ID : 3313)
The character that proves that frogs have evolved from fishes is
- their ability to swim in water
- tadpole larva in frogs
- similarity in the shape of the head
- their feeding on aquatic plants
Q. 15 of Quiz- (Que-ID : 3283)
Ribbon shaped chloroplasts occur in
- Ulothrix
- Spirogyra
- Chlamydomonas
- Riccia
Q. 19 of Quiz- (Que-ID : 3512)
Which one of the following pairs of geographical areas show maximum biodiversity in our country?
- Sunderbans and Rann of Kutch
- Eastern Ghats and West Bengal
- Eastern Himalayas and Western Ghats
- Kerala and Punjab
Q. 16 of Quiz- (Que-ID : 3184)
Tendons connect the following
- bone to bone
- muscle to muscle
- cartilage to muscle
- bone to muscle
Q. 6 of Quiz- (Que-ID : 3149)
Which of the following is not a pyrimidine?
- Uracil
- Cytosine
- Guanine
- Thymine
Q. 16 of Quiz- (Que-ID : 2809)
Which neuroglia cells produce a fatty insulating material called myelin?
- Satellite cells
- Schwann cells
- Both (A) and (B)
- Neither (A) nor (B)
Q. 20 of Quiz- (Que-ID : 3088)
Water stress causes
- opening of stomata
- increase in metabolic rate
- wilting of leaves
- lesser availability of carbon dioxide
Q. 19 of Quiz- (Que-ID : 3362)
The term ‘apiculture’ refers to
- tissue culture
- pisciculture
- bee-keeping
- animal-keeping
Q. 19 of Quiz- (Que-ID : 3262)
Water-Vascular system is found in
- Sea-anemone
- Sea-pen
- Sea-cucumber
- Sea-horse
Q. 12 of Quiz- (Que-ID : 3205)
Which of the following helps in the curling of the leaf surface?
- Bulliform cells
- Xylem tissue
- Palisade parenchyma
- Bundle sheath cells
Q. 7 of Quiz- (Que-ID : 3050)
Malacophily means
- pollination by wind
- pollination by water
- pollination by insects
- pollination by snails
Q. 11 of Quiz- (Que-ID : 2729)
name of agaricus fruiting body
- Fairy rings
- Cleistothecium
- Basidocarp
- Asciocarp
Q. 20 of Quiz- (Que-ID : 3413)
Two microbes found tb be very useful in Genetic Engineering are
- Excherichia coli and Agrobacterium tumefaciens
- Vibrio cholarae and a tailed bacteriophage
- Diplococcus sp. and Pseudomonas sp.
- Crown gall bacterium and Caenorhabdities elegans
Q. 11 of Quiz- (Que-ID : 2979)
What are the structural and functional unit of kidney
- Nephrons
- Cell
- Neurons
- None of the above
Q. 14 of Quiz- (Que-ID : 3057)
Aleurone layer takes part in
- protection of delicate embryo
- enzyme synthesis
- transfer of food to cotyledons
- transfer of food from cotyledons to embryo tips
Q. 3 of Quiz- (Que-ID : 3121)
Which of the following is the unit of ψ?
- Pascal
- Joule
- Newton
- Electron volt
Q. 9 of Quiz- (Que-ID : 3202)
Stem grows in girth due to
- outer cortical
- epidermis
- vascular cambium
- phellogen
Q. 24 of Quiz- (Que-ID : 2993)
Vasa recta is present in which type of nephron
- Cortical nephron
- Juxta medullary nephron
- Both a and b
- None of the above
Q. 2 of Quiz- (Que-ID : 2970)
Which among the following is not ureotelic
- Mammal
- Aquatic insect
- Terrestrial amphibian
- Marine fishes
Q. 24 of Quiz- (Que-ID : 2892)
Which method can be used for women that cannot produce ovum but can provide suitable environment ?
- IUD
- GIFT
- IUI
- IUI
Q. 8 of Quiz- (Que-ID : 3451)
The interaction where one species is benefitted and the other is neither benefitted nor harmed is called
- Commensalism
- Amensalism
- Mutualism
- None of the above
Q. 21 of Quiz- (Que-ID : 2664)
which among the following is caused due to decreased respiratory surface area
- Astma
- Emphysema
- Sclerosis
- None of the above
Q. 8 of Quiz- (Que-ID : 3176)
Which membrane protects the eyes of frog in water?
- Tympanum
- Skin
- Sebaceous
- Nictitating
Q. 5 of Quiz- (Que-ID : 2648)
Thoracic chamber is dorsally formed by
- Vertebral column
- Sternum
- Ribs
- Diaphragm
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