Advanced biology
H.W.2
Question 1 choose the right answer:
1- How many nitrogenous bases are there in DNA?
A- 1
B- 2
C-3
D- 4
2- Which of the following is not a nitrogenous base found in DNA?
a- Adenine
b- Cytosine
c- Guanine
d- Uracil
3- DNA is made up of Nitrogenous base pairs. The bases bond in which of the following
patterns?
a- Adenine – Thymine; Cytosine – Guanine
b- Adenine – Cytosine; Guanine – Thymine
c- Adenine – Guanine; Cytosine – Thymine
d- Adenine – Guanine; Cytosine – Taurine
4- DNA looks like a “twisted ladder”. If the “rungs” of the ladder are made up of nitrogenous
bases, what are the hand rails or backbone of the ladder made up of?
a- Sugars and Salts
b- Phosphates
c- Sugars
d- Sugars and Phosphates
5 - Where is DNA located in the cell?
a- Mitochondria
c- Nucleus
b-Cell Membrane
d- Golgi Body
6- How many chromosomes do we get from our mother?
a- 46
b-23
c- 22
d- 20
7- Who is credited with discovering the structure of DNA?
a-Crick and Neck
b- Watson and Crick
c- Watson and Franklin
d- Holmes and Watson
8- A baby is XY for the gender or sex chromosome. That baby will be a
a-Boy
b- Girl
c- Puppy
d- Can’t tell
9- The experiments of Avery, Hershey and Chase provided evidence that the carrier of genetic
information is …….
a-carbohydrate
b-DNA
c- lipid
d-protein
10- What is the base-pairing rule in the DNA molecule?
a- A—G and C—T
b- A—T and C—G
c- C—A and G—T
c- C—U and A—G
11-What are chromosomes composed of?
a- chromatin and histones
c- DNA and lipids
b- DNA and protein
d-protein and centromeres
12- Which is not an enzyme involved in DNA replication?
a- DNA ligase
b-DNA polymerase
c- hilicase
d- RNA primer
13- Which shows the basic chain of events in all organisms for reading and expressing genes?
a- DNA  RNA  protein
b- RNA  DNA  protein
c-mRNA  rRNA  tRNA
d- RNA processing  transcription 
translation
14- In the RNA molecule, uracil replaces …………………………
a- adenine
b- cytosine
c-purine
d-thymine
15- The relationship between the sequences of bases in DNA and amino acids in protein would
be best stated as :
a- The sequence of nucleotides in DNA is determined by the amino acid sequence of DNA
polymerase.
b- The sequence of nucleotides in a DNA is determined by the amino acids in proteins.
c- The sequence of amino acids is determined by the relative percentages of A, T, G and C in the
DNA.
d- The sequence of amino acids is determined by the sequence of nucleotides in a gene
16- Proof-reading during DNA replication refers to:
a-removal of the RNA primer before connecting Okazaki fragments.
b- pairing of A with T and G with C by DNA polymerase.
c- removal of thymine dimers by excision repair.
d- checking for correct base pairing by DNA polymerase.
17- .12 A. Which one of the following answers correctly shows the orientation of strands in the
DNA double helix?
a-- ’3ATGCATGCATGCATGC – 5’
- ’3ATGCTAGCATGCATGC – 5 ‘
b- - ’3ATGCATGCATGCATGC – 5’
- ’5ATGCTAGCATGCATGC – 3’
c- - ’3ATGCATGCATGCATGC – 5’
- ’3TACGTACGTACGTACG – 5’
d- ’3ATGCATGCATGCATGC – 5’
- ’5TACGTACGTACGTACG – 3’
e - ’3ATGCATGCATGCATGC – 5’
- ’5CGTACGTACGTACGTA – 3’
Question 2
- Ribosome
Transcription
Translation
Nucleus
Use one of the words above to complete each statement.
23.) RNA is “read” and turned into a protein during the process of
…………………………………………….
This process occurs in the …………………………..
24.) DNA is converted into RNA during the process of DNA
…………………………………………
This process occurs in the ……………………………………………………..