11th class (FSc) Biology unit 11 MCQs
76. Glycolysis is the breakdown of glucose up in the formation of:
a. ATP
b. NAD
c. Pyruvic acid
d. Sulphuric acid
77. In respiratory chain , NADH is oxidized by:
a. Cytochrome “b”
b. Co-factor
c. Cytochrome “c”
d. Coenzyme
78. The electron transport chain system play role in generation of ATP by:
a. Photosynthesis
b. Photosynthesis
c. Dark reaction
d. Chemiosmosis
79. During respiratory chain coenzyme Q is oxidized by:
a. Cytochrome c
b. Cytochrome a
c. Cytochrome a3
d. Cytochrome b
80. The number of oxidation steps during one krebs cycle are;
a. 04
b. 02
c. 05
d. 03
81. Acetic acid on entering the mitochondrion unites with co-coenzyme-A to form:
a. Fumarate
b. Active acetate
c. a- ketogultarate
d. Pyruvic acid
82. The first step of krebs cycle is union of acetyl Co-A with oxaloacetate to form:
a. Citrate
b. Isocitrate
c. Malate
d. a- ketogultarate
83. Which one of the following is not concerned with oxidative phosphorylation?
a. Cytochrome a3
b. Coenzyme Q
c. Plastocyanin
d. Cytochrome b
84. Pyruvic acid is formed from glucose in:
a. Cytosol
b. Matrix of mitochondria
c. Chloroplast
d. Stroma
85. Photosyntem II has the form of chlorophyll a which absorbs best light of:
a. 690 nm
b. 670 nm
c. 700 nm
d. 680 nm
86. From one pyruvate passing through Kreb’s cycle FADH2 molecules are formed:
a. 3
b. 1
c. 4
d. 2
87. From one pyruvate passing through Kreb cycle how manyFADH2 molecules are formed?
a. 03
b. 01
c. 04
d. 02
88. Pryruvic acid is the end of glycolysis before entering the krebs cycle is changed into a two carbon compound:
a. Succinic acid
b. Citric acid
c. 0C- Ketoglutaric acid
d. Acetic acid
89. Formula of lactic acid is:
a. C3 H6 O3
b. C3 H4 O3
c. C3 H5 OH
d. C3 H5 O3
90. In yeast the products of anaerobic respiration are:
a. Lactic acid
b. Methyl alcohol
c. Pyruvic acid
d. Ethyl alcohol
91. Enzymes involved in cellular respiration are found in:
a. Mitochondria
b. Cytoplasm
c. Endoplasmic Reticulum
d. Golgi bodies
92. Glycolysis is the breakdown of glucose up to the formation of:
a. ATP
b. Pyruvic acid
c. NAD
d. Sulphuric acid
93. Thylakoid membranes are involved in ATP synthesis by a process known as:
a. Chemiosmosis
b. Glycolysis
c. Photolysis
d. Dark reaction
94. The process by which pH gradients across membrane derives of formation of ATP is called:
a. Photorespiration
b. Photosynthesis
c. Calvin cycle
d. Chemiosmosis
95. Synthesize of ATP in the presence of oxygen is called:
a. Chemiosmosis
b. Oxidative photophorylation
c. Fermatation
d. Photophorylation
96. Important source of atmospheric oxygen, released during photosynthesis is from:
a. Nitrates
b. Water
c. Glucose
d. Carbon dioxide
97. In mitochondria, the pumping of protn(Chemiosmosis) is across the:
a. Matrix
b. Outer membrane
c. Inter membranous space
d. Inner membrane
98. The mechanism of photopho-sphorylation takes place in conjunction with the respiratory chain in the inner membrane of:
a. Golgi bodies
b. Mitochondria
c. Lysosomes
d. Chloroplast
99. Rubisco is:
a. An enzyme
b. Compound used during light reaction
c. A coenzyme
d. Electron receptor
100. The water splitting up of photosynthesis that release oxygen is called:
a. Chemiosmosis
b. Electron transport chain
c. Dark reaction
d. Photolysis