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Question-1
DNA is composed of repeating units of
(A)
ribonucleosides
(B)
deoxyribonucleosides
(C)
ribonucleotides
(D)
deoxyribonucleotides.
Question-2
Lipids are insoluble in water because lipid molecules are
(A)
hydrophilic
(B)
hydrophobic
(C)
neutral
(D)
zwitter ions
Question-3
Mineral associated with cytochrome is
(A)
Cu
(B)
Mg
(C)
Cu and Mg
(D)
Fe.
Question-4
In double helix of DNA, the two DNA strands are
(A)
coiled around a common axis
(B)
coiled around each other
(C)
coiled differently
(D)
coiled over protein sheath.
Question-5
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
(A)
base-sugar-phosphate
(B)
base-sugar-OH
(C)
base-sugar-phosphate
(D)
sugar-phosphate
Question-6
A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is
(A)
120
(B)
240
(C)
60
(D)
480.
Question-7
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
(A)
help in regulating metabolism
(B)
are exclusively synthesized in the body living organism as at present
(C)
are conjugated proteins
(D)
enhance oxidative metabolism
Question-8
Cellulose, the most important constituent of plant cell wall is made up of
(A)
branched chain of glucose molecules linked by
β
-1, 4 glycosidic bond in straight chain and
α
-I, 6 glycosidic bond at the site of branching
(B)
unbranched chain of glucose molecules linked by
β
-1, 4 glycosidic bond
(C)
branched chain of glucose molecules linked by
α
-I, 6 glycosidic bond at the site of branching
(D)
unbranched chain of glucose molecules linked by
α
-I, 4 glycosidic bond.
Question-9
In RNA, thymine is replaced by
(A)
adenine
(B)
guanine
(C)
cytosine
(D)
uracil.
Question-10
Carbohydrates, the most abundant biomolecule on earth, are produced by
(A)
some bacteria, algae and green plant cells
(B)
fungi, algae and green plant cells
(C)
all bacteria, fungi and algae
(D)
viruses, fungi and bacteria
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Plus 2 Biology Science
CBSE
Practice in Related Chapters
Plant Reproduction
Animal Tissue
Kingdom Monera
Plant Kingdom
Biological Classification
General Biology
Respiratory System
Digestive System And Nutrition
Circulatory System and Immunity
Plant Morphology
Plant Anatomy
Cell Reproduction
Human Genetics & Genetic Disorders
Mendelian & Postmendelian Genetics
Genes & Chromosomes
Biomolecules
Enzymes
Cell Respiration
Cell Respiration
Kingdom Fungi
Aging And Death
Common Human Diseases
Evolution
Drug And Addiction
Reproduction And Embryonic Development
Endocrine System
Excretion And Osmoregulation
Nervous System & Sense Organs
Musculo-Skeletal System
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