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Worksheets

Genetics

Total questions: 20

Worksheet time: 6mins

Name
Class
Date
1.

Which molecule contains the genetic code?

a)

DNA

b)

mRNA

c)

tRNA

d)

rRNA

2.

RNA contains the sugar

a)

ribose

b)

deoxyribose

c)

glucose

d)

lactose

3.

The anti-codon

a)

contains a sequence the same as the codon

b)

contains a sequence complementary to the codon 

c)

contains the base thymine

4.

Amino acids are joined together in order to form

a)

DNA

b)

ribosomes

c)

proteins 

d)

RNA

5.

Which sequence could be found in RNA?

a)

ACCTGT

b)

CGCATT

c)

AUGCUU

6.

How many bases are in one codon?

a)

1

b)

2

c)

3

d)

4

7.

The factors or agents that cause mutation are called as

a)

Mutagens

b)

Mutation

c)

Mutants

8.

. 

Each three-letter sequence of mRNA nucleotide corresponds to a specific amino acid, or to a stop codon. The following are the stop codons except

a)

UGA

b)

UAA

c)

UAG

d)

AUG

9.

Outcomes of point mutations include

a)

missense mutation

b)

nonsense mutation

c)

silent mutation

d)

all of the above

10.

Which of the following mechanisms will remove uracil and incorporate the correct base?

a)

Direct repair

b)

Base excision repair

c)

Mismatch repair

d)

Nucleotide excision repair

11.

Which of the following has the self-repairing mechanisms?

a)

DNA and RNA

b)

DNA, RNA and protein

c)

Only DNA

d)

DNA and proteins

12.

The enzyme photolyase is used in what method of repair?

a)

Base excision

b)

Photo reactivation

c)

Nucleotide excision

d)

None of the mentioned

13.

If the mutation has a negligible effect on the function of a gene, it is known as a

a)

Silent mutation

b)

Frame shift mutation

c)

Substitution mutation

d)

Insertion mutation

14.

How many structural genes are present in a lac operon?

a)

One

b)

Five

c)

Three

d)

Seven

15.

Which polycistronic structural gene is regulated by a common promoter and regulatory gene?

a)

Trp operon

b)

Lac operon

c)

Ara operon

d)

His operon

16.

In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule.

a)

TRUE

b)

FALSE

17.

DNA synthesis refers to the process by which RNA is made from DNA.  

a)

TRUE

b)

FALSE

18.

The enzymes that break hydrogen bonds and unwind DNA are helicases.

a)

TRUE

b)

FALSE

19.

Okazaki fragments form on the leading strand.

a)

TURE

b)

FALSE

20.

Non-homologous end joining is less likely to produce mutations than homologous recombination.

a)

TRUE

b)

FALSE