Download DNA, chromosomes and genes worksheet

EST-4
Practice
Name:
DNA, Chromosomes and Genes
1. Make the complimentary DNA strand for the following nitrogen bases.
C G C A T A C GA A T C G T T A A C T G A A TA A
2. What is the mRNA strand that would be made from the DNA strand above?
3. Using the mRNA from number 2 write the appropriate complimentary tRNA triplet
codes. Include a symbol to represent each amino acid that has bonded to the tRNA.
(The same amino acid should have the same symbol). Use your text to identify the
names of the amino acids involved.
4. Using the sequence from number 3, where did the protein synthesis begin and end?
5. Complete the tables below with the appropriate complimentary strands.
a)
DNA
mRNA
U-C-C-A-U-G-C-C-C-A-U-C-C-C-G-A-C-G-U-A-A-C-G-A-G
tRNA
Amino acids
b)
DNA
mRNA
tRNA
C-C-G-A-U-A-C-G-A-U-A-C-C-C-C-C-A-C-U-G-G-G-C-A
Amino acids
c)
DNA
mRNA
tRNA
Amino acids
C-C-A-T-T-A-C-C-G-G-A-C-A-G-T-G-T-T-G-T-A-A
8. Fill in the blanks.
a) Chromosomes are made up of ____________________________. Segments of DNA
are ____________. Chromosomes, genes and DNA are found in the
__________________ of a cell.
b) DNA contains a sugar called _____________ while RNA contains a sugar called
___________. The shape of DNA is a __________________. __________ is a
nitrogen base that will never be found in RNA.
c) When transcription occurs the type of RNA used is ___________________ and when
translation occurs ____________________ is the type of RNA used.
d) A _______________ moves along a mRNA strand to read the genetic code.
e) Protein synthesis occurs in the _______________________. A chain of amino acids
produce a _______________________. The amino acid sequence depends on a
person’s ______________________.
f) In our bodies, proteins are responsible for ________________________________ and
_______________________Some examples of different proteins are ______________,
________________ and ______________________.
g) Individuals look different because they have different ____________________. A
human has ____ chromosomes. _____ chromosomes are inherited by the father and
___ chromosomes are inherited from the mother. All the genes we inherit from our
parents make up our ______________.
h) Mutations are errors in the genetic code. These can occur during cell division when the
DNA __________________. ______________ are environmental agents that may
cause mutations. Those that cause cancer are known as ____________________.
Examples include _______________ ,_______________ and ______________.