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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Laughing gas has chemical composition of following two elements ...?

(A) Nitrogen + Hydrogen
(B) Nitrogen + Carbon

(C) Nitrogen + Oxygen
(D) Oxygen + Carbon

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The average heartbeat per minute in a normal man is _________...?

(A) 50
(B) 70

(C) 80
(D) 100

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What is a distinguishing character of arachnids...?

(A) 6 legs
(B) 8 legs

(C) Antennae
(D) Wings

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Detergents dissolved in water help in cleaning clothes by_________...?

(A) Increasing the temperature of water
(B) Reacting chemically with dirt

(C) Reducing the surface tension of water
(D) Dissolving dirt

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Who discovered blood circulation...?

(A) Carl Linnaeus
(B) Francis Crik

(C) Robert. Brown
(D) William Harvey

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How many years our solar system takes to one orbit around Milky Way galaxy...?

(A) 250
(B) 225

(C) 300
(D) 275

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Basic metals can be converted into gold by ...?

(A) Heating
(B) Beating

(C) Artificial nuclear radioactivity
(D) Chemical reaction

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The speed of the sound in air is ______...?

(A) 143 m/s
(B) 243 m/s

(C) 343 m/s
(D) 443 m/s

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Which planet in our solar system has the most gravity...?

(A) Jupiter
(B) Mercury

(C) Venus
(D) Neptune

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