Why does cytosine not form a bond with adenine...? Mcqs

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Why does cytosine not form a bond with adenine...?

(A) Cytosine is unable to form hydrogen bonds with adenine.
(B) Adenine and cytosine have incompatible hydrogen bond donors and acceptors.

(C) Cytosine only pairs with thymine due to their complementary structures.
(D) Adenine is a pyrimidine and cannot bond with cytosine.

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The hard, solid rocks, whose composition or texture has been changed by heat or pressure in the Earth are called____________...?

(A) Sedimentary rocks
(B) Metamorphic rocks

(C) Igneous rocks
(D) All of the above

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The hormone which is clinically used as a bronchodilator and heart stimulant is:...?

(A) Epinephrine
(B) Norepinephrine

(C) Calcitonin
(D) Thyroxine

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The optical phenomenon in which the splitting of white light into seven distinct colors occur is called...?

(A) Refraction
(B) Dispersion

(C) Reflection
(D) Diffraction

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What is chemical symbol for Tungsten...?

(A) Z
(B) T

(C) Tn
(D) W

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The unit of home electricity energy consumption is ...?

(A) Watt hour
(B) Joule hour

(C) Killowatt hour
(D) Kilo joule hour

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_________ is psychological study of values and moral principles...?

(A) Axiology
(B) Sociology

(C) Idiology
(D) Criminology

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The essential elements for plant growth are...?

(A) Carbon (C), Oxygen (O), and Hydrogen (H)
(B) Phosphorus (P), Potassium (K), and Nitrogen (N)

(C) Helium (He), Neon (Ne), and Argon (Ar)
(D) Calcium (Ca), Magnesium (Mg), and Sulfur (S)

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The life cycle of butterfly is...?

(A) Eggs→caterpillar→pupa→butterfly
(B) Eggs→pupa→caterpillar→butterfly

(C) Eggs→butterfly→caterpillar→pupa
(D) Eggs→caterpillar→butterfly→pupa

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In the taxonomic hierarchy choose the term which encompasses all other in the list...?

(A) Genus
(B) Species

(C) Order
(D) Class

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