Botany Practice Test || Exam Questions (71-80)

Botany Practice Test(Questions 101-120)|| Biochemistry Quiz

71. In a spectrophotometer, the purpose of using a monochromator is to:

A) Detect light intensity changes B) Filter the emitted light into specific wavelengths C) Amplify the sample signal D) Measure the mass of molecules

72. The microscope technique ideal for visualizing live cells without staining:

A) Fluorescence microscopy B) Scanning electron microscopy (SEM) C) Phase-contrast microscopy D) Transmission electron microscopy (TEM)

73. The parameter which measures the spontaneity of a biochemical reaction:

A) Enthalpy (ΔH) B) Free energy (ΔG) C) Entropy (ΔS) D) Activation energy (Ea)

74. The enzyme responsible for catalysing the breakdown of hydrogen peroxide into water and oxygen:

A) Superoxide dismutase B) Peroxidase C) Catalase D) Glutathione reductase

75. The vitamins which acts as a coenzyme for carboxylation reactions:

A) Vitamin B1 (Thiamine) B) Vitamin B7 (Biotin) C) Vitamin B12 (Cobalamin) D) Vitamin C (Ascorbic acid)

76. In an enzyme catalysed reaction, a low Km value indicate high:

A) Substrate affinity B) Reaction rate C) Turnover number D) Product formation

77. The purine which is the primary precursor in purine nucleotide biosynthesis:

A) Guanine B) Hypoxanthine C) Xanthine D) Inosine monophosphate (IMP)

78. Which lipid category does phosphatidylcholine belong to?

A) Glycolipids B) Sphingolipids C) Glycerophospholipids D) Sterols

79. The unusual amino acid which is typically found in collagen:

A) Selenocysteine B) Hydroxyproline C) γ-carboxyglutamate D) N-formyl methionine

80. The Ramachandran plot primarily provides information about which of the following aspects of protein structure?

A) Protein folding pathway B) Tertiary structure formation C) Permissible dihedral angles of amino acid residues D) Amino acid side chain interactions

Your Results: