12th Grade > Biology
BIOMOLECULES MCQs
Total Questions : 58
| Page 3 of 6 pages
Answer: Option A. -> The enzyme can bind to substrates of only one shape
:
A
The specific action of an enzyme with a single substrate can be explained using aLock and Keyanalogy first postulated in 1894 by Emil Fischer. In this analogy, thelockis the enzyme and thekeyis the substrate. Only the correctly sizedkey (substrate) fits into thekeyhole (active site) of thelock(enzyme).
:
A
The specific action of an enzyme with a single substrate can be explained using aLock and Keyanalogy first postulated in 1894 by Emil Fischer. In this analogy, thelockis the enzyme and thekeyis the substrate. Only the correctly sizedkey (substrate) fits into thekeyhole (active site) of thelock(enzyme).
Answer: Option B. -> Structural integrity
:
B
Proteins, at times, may be simple in structure, but in significance, they play a major role. They function to help in Catalysis, Structural integrity, Functional integrity and as Constituents.
For example; simple proteins like Keratin and Collagen provide Structural integrity.
:
B
Proteins, at times, may be simple in structure, but in significance, they play a major role. They function to help in Catalysis, Structural integrity, Functional integrity and as Constituents.
For example; simple proteins like Keratin and Collagen provide Structural integrity.
Answer: Option D. -> 5' TAAGCGATA 3’
:
D
In a double stranded DNA, the sequence of nucleotides is complementary to each other. That is, A pair with T and G pair with C. So, the sequence of nucleotide for 3 ‘ATTCGCTAT 5’ will be 5’TAAGCGATA 3’.
:
D
In a double stranded DNA, the sequence of nucleotides is complementary to each other. That is, A pair with T and G pair with C. So, the sequence of nucleotide for 3 ‘ATTCGCTAT 5’ will be 5’TAAGCGATA 3’.
Answer: Option B. -> Both assertion and reason are true but reason is not the correct explanation of the assertion.
:
B
Reducing sugars contain a free aldehyde or an alpha-keto group which can reduce Tollen's or Fehling's reagent. Sucrose is a non reducing sugar. In sucrose, the components glucose (alpha-D-glucopyranose unit) and fructose (beta-D-fructo furanose) are linked via an acetal bond between C1 on the glucosyl subunit and C2 on the fructosyl unit via a glycosidic bond. The glycosidic bond is formed between the reducing ends of both glucose and fructose, and not between the reducing end of one and the nonreducing end of the other, like in reducing sugars. Therefore, sucrose contains no free aldehyde or ketone group. Instead it contains stable acetal or ketal structure which cannot be opened into a free carboxyl group and therefore cannot reduce Tollen's or Fehling's reagent.
:
B
Reducing sugars contain a free aldehyde or an alpha-keto group which can reduce Tollen's or Fehling's reagent. Sucrose is a non reducing sugar. In sucrose, the components glucose (alpha-D-glucopyranose unit) and fructose (beta-D-fructo furanose) are linked via an acetal bond between C1 on the glucosyl subunit and C2 on the fructosyl unit via a glycosidic bond. The glycosidic bond is formed between the reducing ends of both glucose and fructose, and not between the reducing end of one and the nonreducing end of the other, like in reducing sugars. Therefore, sucrose contains no free aldehyde or ketone group. Instead it contains stable acetal or ketal structure which cannot be opened into a free carboxyl group and therefore cannot reduce Tollen's or Fehling's reagent.
Answer: Option D. -> Leucine
:
D
Amino acids can be classified as essential or non-essential amino acids based on whether they are synthesized in the body or have to be obtained from external sources through food. There are9essential amino acids which have to be obtained in our diet. Theseare: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
:
D
Amino acids can be classified as essential or non-essential amino acids based on whether they are synthesized in the body or have to be obtained from external sources through food. There are9essential amino acids which have to be obtained in our diet. Theseare: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
Answer: Option D. -> Triose, Tetrose, Pentose, HexoseÂ
:
D
These are sugars which have Carbon molecules ranging from three to six.
As the terms indicate, Tri-3, Tetra-4, Penta-5, and Hexa-6. Therefore, D is the answer
:
D
These are sugars which have Carbon molecules ranging from three to six.
As the terms indicate, Tri-3, Tetra-4, Penta-5, and Hexa-6. Therefore, D is the answer
Answer: Option C. -> Adipose tissue
:
C
Adipose tissue or fatty connective tissue can be found in bone marrow, epidermal of skin, and around kidney. It functions as food storage, mechanical cushion, and protection from high temperature. The tissues contains a large amount of round-shaped (polygonal) and thin-wall cell withfat globules stored in it.
Areolar Tissueis loose connectivetissuethat consists of a meshwork of collagen, elastictissue, and reticular fibres - with many connectivetissuecells in between the meshwork of fibres. The fibres that form the mesh structure ofareolar tissueinclude: Collagen Fibres.
Yellow fibrous tissue consists of matrix containing yellow elastic fibers. The fibers branch to from network. Yellow elastic tissue can be found on artery wall and ligament. The functions are for support and protective.
White fibroustissueis a type of connective tissue present in many locations throughout the body, including skin (e.g. dermis), ligaments, tendons, cartilage and bones.
:
C
Adipose tissue or fatty connective tissue can be found in bone marrow, epidermal of skin, and around kidney. It functions as food storage, mechanical cushion, and protection from high temperature. The tissues contains a large amount of round-shaped (polygonal) and thin-wall cell withfat globules stored in it.
Areolar Tissueis loose connectivetissuethat consists of a meshwork of collagen, elastictissue, and reticular fibres - with many connectivetissuecells in between the meshwork of fibres. The fibres that form the mesh structure ofareolar tissueinclude: Collagen Fibres.
Yellow fibrous tissue consists of matrix containing yellow elastic fibers. The fibers branch to from network. Yellow elastic tissue can be found on artery wall and ligament. The functions are for support and protective.
White fibroustissueis a type of connective tissue present in many locations throughout the body, including skin (e.g. dermis), ligaments, tendons, cartilage and bones.
Answer: Option A. -> They bind to the substrate and reduce the activation energy of the reaction
:
A
Most reactions in nature would occur very slowly because it has a high activation energy barrier, that is, it requires a very high energy input for the reaction to occur. In presence of an enzyme, the activation energy is lowered and thus the enzyme makes it feasible for the reaction to occur.
:
A
Most reactions in nature would occur very slowly because it has a high activation energy barrier, that is, it requires a very high energy input for the reaction to occur. In presence of an enzyme, the activation energy is lowered and thus the enzyme makes it feasible for the reaction to occur.
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