Biology assignment Nazreen sem 1

Molecule of Life
&

Cell Structures and functions



Name: Nazreen Bin Tajuddin
Practicum: H7T01A
Matric Number: MS2113172701

State the main type of
molecules of life

Water
Carbohydrates
Lipids
Proteins
Nucleic acid

With the aid of
a labeled
diagram,

describe the
structure of
water molecule

Body temperature may rise during hot days. How can sweating help to give
cooling effect for our body? What about animals that do not sweat such as

elephants? Give explanation by applying the concept related to the
properties of water




water has high latent heat of vapourisation. High amount of heat

energy (580 calories of heat) is required or absorbed to turn 1g of
water from liquid state into water vapour.This is to break

hydrogen bonds to separate the water molecule. Animals that do
not sweat will bathe or wet themselves with water. High amount of

heat energy is also used when water droplets on their skin
evaporate

Water molecules move osmosis is the movement of water
into or out of cells molecules from higher water

through osmosis. Explain potential region to a lower water
on potential region across a selectively

osmosis and compare it permeable membrane until
with the other types of equilibrium is reached

passive transport

similarities:

osmosis is similar to simple
diffusion and facilitated diffusion

since all are types of passive
transport and no energy required.

In which molecules move down
their concentation gradient

Differences:

Osmosis is for water molecules only while simple diffusion
may involve small, non-charged,lipid-soluble and

hydrophobic molecules and facilitated diffusion may involve
larger, charged, polar or hydrophilic molecules. osmosis
may involve movement through phospholipid bilayer or

protein channel aquaporins while simple diffusion involves
movement through phospolipid bilayer only and facilitated

diffusion involves movement through channel protein or
carrier proteins