wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

en sci quiz

Total questions: 60

Worksheet time: 34mins

Name
Class
Date
1.

What is the backbone of a DNA molecule made of?

a)

Ribose and Phosphate

b)

Deoxyribose and Phosphate

c)

Glucose and Nitrogen

d)

Ribose and Protein

2.

Which bases are classified as purines?

a)

Adenine and Cytosine

b)

Adenine and Guanine

c)

Thymine and Guanine

d)

Cytosine and Thymine

3.

How many hydrogen bonds connect adenine and thymine?

a)

1

b)

2

c)

3

d)

4

4.

Who discovered the double-helix structure of DNA?

a)

Rosalind Franklin

b)

Friedrich Miescher

c)

Watson and Crick

d)

Gregor Mendel

5.

Humans have how many pairs of chromosomes?

a)

21

b)

22

c)

23

d)

46

6.

The Central Dogma of molecular biology describes the flow of information from:

a)

DNA → Protein → RNA

b)

Protein → RNA → DNA

c)

DNA → RNA → Protein

d)

RNA → DNA → Protein

7.

The enzyme that unwinds DNA strands is:

a)

Ligase

b)

Helicase

c)

Topoisomerase

d)

Primase

8.

Which enzyme removes RNA primers during replication?

a)

DNA Polymerase III

b)

DNA Polymerase I

c)

Ligase

d)

SSB Proteins

9.

The lagging strand in DNA replication is synthesized in short fragments called:

a)

Histones

b)

Exons

c)

Okazaki fragments

d)

Nucleosomes

10.

During which phase of the cell cycle does DNA replication occur?

a)

G1

b)

S

c)

G2

d)

M

11.

Which type of RNA carries amino acids to the ribosome?

a)

mRNA

b)

tRNA

c)

rRNA

d)

snRNA

12.

Transcription occurs in the:

a)

Cytoplasm

b)

Nucleus

c)

Ribosome

d)

Golgi Apparatus

13.

Which codon serves as the universal start codon?

a)

AUG

b)

UAA

c)

UAG

d)

UGA

14.

Exons are:

a)

Non-coding DNA removed during splicing

b)

Coding regions that remain in mRNA

c)

Enzymes for replication

d)

RNA primers

15.

The P site of a ribosome is where:

a)

tRNA enters

b)

tRNA exits

c)

Polypeptide chain grows

d)

mRNA binds

16.

A mutation involving a change of a single nucleotide is called:

a)

Frameshift mutation

b)

Point mutation

c)

Duplication

d)

Insertion

17.

Which chromosomal mutation involves reversal of a segment?

a)

Deletion

b)

Inversion

c)

Translocation

d)

Duplication

18.

Failure of chromosomes to separate properly during meiosis is:

a)

Crossing over

b)

Nondisjunction

c)

Translocation

d)

Duplication

19.

An agent that increases the rate of mutation is called:

a)

Polymerase

b)

Mutagen

c)

Ligase

d)

Codon

20.

Which type of mutation alters the reading frame of DNA?

a)

Frameshift

b)

Point

c)

Substitution

d)

Inversion

21.

Which syndrome is caused by trisomy 21?

a)

Edward’s Syndrome

b)

Patau’s Syndrome

c)

Down’s Syndrome

d)

Klinefelter’s Syndrome

22.

Which test involves withdrawing amniotic fluid for genetic testing?

a)

Ultrasound

b)

Amniocentesis

c)

Chorion villi sampling

d)

Karyotyping

23.

Klinefelter’s Syndrome results in which karyotype?

a)

45, X

b)

46, XY

c)

47, XXY

d)

47, XXX

24.

Which disorder is sex-linked and involves failure of blood clotting?

a)

Hemophilia

b)

Sickle Cell Anemia

c)

Phenylketonuria

d)

Cystic Fibrosis

25.

Which genetic disorder causes “sickle”-shaped red blood cells?

a)

Hemophilia

b)

Sickle Cell Anemia

c)

Down’s Syndrome

d)

Fragile X Syndrome

26.

Biodiversity refers to the variety of life at all levels, from genes to:

a)

Atoms

b)

Ecosystems

c)

Molecules

d)

Organs

27.

Which type of biodiversity refers to variety of genes within a population?

a)

Genetic diversity

b)

Species diversity

c)

Ecosystem diversity

d)

Community diversity

28.

Which is an abiotic factor?

a)

Fungi

b)

Bacteria

c)

Soil

d)

Plants

29.

Carrying capacity refers to:

a)

Maximum number of individuals an ecosystem can support

b)

Minimum number of species required in an ecosystem

c)

Total number of genes in a population

d)

Number of prey in a food chain

30.

A biodiversity index greater than 0.5 indicates:

a)

Low biodiversity

b)

Healthy ecosystem

c)

Imbalanced population

d)

Endangered environment

31.

Which term refers to a species with rapidly declining population?

a)

Extinct

b)

Endangered

c)

Threatened

d)

Stable

32.

Habitat destruction caused by cutting down forests is called:

a)

Eutrophication

b)

Siltation

c)

Deforestation

d)

Pollution

33.

Which factor limits population growth by spreading faster in large populations?

a)

Predation

b)

Disease

c)

Weather

d)

Competition

34.

Which of the following is a limiting abiotic factor?

a)

Predators

b)

Parasites

c)

Food supply

d)

Sunlight

35.

The disappearance of a species from Earth is called:

a)

Endangered

b)

Extinct

c)

Threatened

d)

Mutated

36.

Which bond holds the two strands of DNA together?

a)

Hydrogen bonds

b)

Ionic bonds

c)

Covalent bonds

d)

Peptide bonds

37.

Which RNA type makes up ribosomes?

a)

mRNA

b)

tRNA

c)

rRNA

d)

snRNA

38.

Which scientist took X-ray diffraction images of DNA?

a)

Rosalind Franklin

b)

James Watson

c)

Francis Crick

d)

Friedrich Miescher

39.

Which disorder is caused by trisomy 18?

a)

Edward’s Syndrome

b)

Patau’s Syndrome

c)

Down’s Syndrome

d)

Turner’s Syndrome

40.

Which process produces genetically identical daughter cells?

a)

Meiosis

b)

Mitosis

c)

Crossing-over

d)

Transcription

41.

Which codon is NOT a stop codon?

a)

UAA

b)

UAG

c)

AUG

d)

UGA

42.

Which type of succession occurs after a fire?

a)

Primary succession

b)

Secondary succession

c)

Tertiary succession

d)

Genetic drift

43.

Sugar in DNA backbone is called a (a)   .

44.

Nitrogen base that pairs with Guanine is (a)   .

45.

Scientist who first isolated DNA (Swiss chemist) is (a)   .

46.

Enzyme that seals gaps in DNA strands is (a)   .

47.

Short DNA segments in lagging strand are called (a)   .

48.

Stage of cell cycle where replication happens is (a)   .

49.

Process of copying DNA into mRNA is called (a)   .

50.

Three-base sequence in mRNA that codes for amino acid is (a)   .

51.

Organelle where proteins are synthesized is (a)   .

52.

Mutation caused by adding or deleting nucleotides is (a)   .

53.

Chromosome abnormality caused by failure to separate is (a)   .

54.

Type of mutation in hemoglobin causing sickle-shaped RBCs is (a)   .

55.

Genetic disorder with 47, XXY is (a)   .

56.

Trisomy involving chromosome 13 is (a)   .

57.

Genetic disorder due to absence of clotting factor is (a)   .

58.

Variety of species in an ecosystem is (a)   .

59.

Factor that restricts number of individuals in a population is (a)   .

60.

Convert 5’ – TAC GGA TCC TAA CGT GAC TGA CAT – 3’ into mRNA (place the primes at the end and start)

(a)  

Similar Resources on Wayground

Midterm Review

63 questions

Midterm Review

quiz

Worksheet

•

9th Grade