BIOLOGY ASSIGNMENT ZAILANUR

Molecules of life & cell
structures & functions

NAME:ZAILANUR ADIRA BINTI
ZAINORMALE

M ATRICS NUMBER: MS2113172588
PRACTICUM:H2T04A


SET E

MAIN TYPES OF MOLECULES OF LIFE

1.wATER

3.PROTEINS

2.DNA AND RNA 4. CARBOHYDRATEs
MOLECULES

5.LIPIDS

Compare and contrast between DNA and RNA

Both molecules of DNA and RNA
are from nucleic acid.
Both monomer for DNA AND RNA
are nucleotides.
Each nucleotides consists of
pentose sugar, phosphate group
and a nitrogenous base in each
nucleotides.

D
NA RNA


DNA is double stranded RNA is single stranded

Pentose sugar in DNA is deoxyribose Pentose sugar in RNA is ribose

Nitrogenous bases in DNA are Adenine, Nitrogenous bases in RNA are Adenine, uracil,
Thymine, Cytosine and Guanine cytosine, guanine

DNA is more stable RNA is less stable
The ratio of A to T and G to C is one
The ratio of A to U and G to C is varies

There is 1 type of DNA only There is 3 types of RNA, mRNA, tRNA and rRNA

DNA is relatively a larger molecule RNA is relatively a small molecule
DNA is found in nucleus RNA is found in nucleus and cytoplasm

How to calculate the percentage of cytosine if
a DNA molecule contains 24 %thymine

In DNA amount of thymine= amount
of adenine
Amount of guanine= amount of
cytosine
Adenine +thymine =24% +24%= 48%
Guanine + Cytosine =100%- 48%
=52%
Therfore, cytosine =52% /2 = 26%

Differentiation between DNA in prokaryotic
and eukaryotic cells

In prokaryotic cell, DNA is not bounded by nucleus
envelope, while eukaryotic cell, DNA is bounded by
nucleus envelope.
DNA in prokaryotic cell is circular, while DNA in
eukaryotic cell is linear.
DNA in prokaryotic cell does not associate with
histone protein, while DNA in eukaryotic associates
with histone protein.

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