1,015 Questions

Biology

Practice Biology MCQs from the Science syllabus.

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ScienceHard
Biology
Genetics

The specific sequence of three nucleotides on tRNA that pairs with a codon on mRNA is called:

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ScienceHard
Biology
Genetics

Which of the following describes a 'Nullisomy'?

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ScienceHard
Biology
Genetics

In a DNA molecule, the strands are 'antiparallel'. This means:

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ScienceHard
Biology
Genetics

Who proposed the 'Chromosomal Theory of Inheritance'?

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ScienceHard
Biology
Genetics

The process of protein synthesis from mRNA is called:

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ScienceHard
Biology
Genetics

What is the phenotypic ratio in the F2 generation of a dihybrid cross if the traits show incomplete dominance?

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ScienceHard
Biology
Genetics

An individual with the genotype AaBb will produce how many types of gametes?

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ScienceHard
Biology
Genetics

Which of the following is an example of continuous variation?

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ScienceHard
Biology
Genetics

A mutation that involves the replacement of a single nitrogenous base with another is called:

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ScienceHard
Biology
Genetics

What is a 'Cistron'?

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ScienceHard
Biology
Genetics

In a test cross involving F1 dihybrid (RrYy), the phenotypic ratio will be:

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ScienceHard
Biology
Genetics

What determines the primary structure of a protein?

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ScienceHard
Biology
Genetics

Which of the following represents 'Ploidy'?

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ScienceHard
Biology
Genetics

A backcross is a cross between:

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ScienceHard
Biology
Genetics

In a cross between homozygous dominant and heterozygous individuals, what is the probability of recessive phenotype?

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ScienceHard
Biology
Genetics

The enzyme that joins DNA fragments (like Okazaki fragments) is:

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ScienceHard
Biology
Genetics

The phenomenon where one gene influences multiple, seemingly unrelated phenotypic traits is called:

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ScienceHard
Biology
Genetics

How many autosomes are present in a human diploid cell?

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ScienceHard
Biology
Genetics

What happens during the 'S-phase' of the cell cycle?

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ScienceHard
Biology
Genetics

If a trait is only passed from father to son, it is likely:

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