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Question-1
DNA is composed of repeating units of
(A)
ribonucleosides
(B)
deoxyribonucleosides
(C)
ribonucleotides
(D)
deoxyribonucleotides.
Question-2
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-3
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
Question-4
RNA does not possess
(A)
uracil
(B)
adenine
(C)
thymine
(D)
cytosine.
Question-5
Amino acids are mostly synthesised from
(A)
mineral salts
(B)
fatty acids
(C)
volatile acids
(D)
α
-keto glutaricacid
Question-6
Which of the following is the simplest amino acid?
(A)
alanine
(B)
asparagine
(C)
glycine
(D)
tyrosine
Question-7
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-8
In RNA, thymine is replaced by
(A)
adenine
(B)
guanine
(C)
cytosine
(D)
uracil.
Question-9
About 98 percent of the mass of every organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen
(A)
sulphur and magnesium
(B)
magnesium and sodium
(C)
calcium and phosphorus
(D)
phosphorus and sulphur
Question-10
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
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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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