A Level Biology Sample Questions I

The blood clotting process starts when cell fragments called ....................................................................
 release molecules of ................................................................... . These molecules
 are ................................................................... which catalyse the conversion of ....................................................................
 into .................................................................... , in the presence of calcium ions. As a result, fibrinogen
 is converted into fibrin and blood cells are trapped to form the clot.
_
Fibrinogen and fibrin are both proteins.
A protein consists of a chain of amino acids joined together by bonds.
In the space below, draw a diagram to show the structure of an amino acid.
_
Name the covalent bond that joins the amino acids into a chain.
_
Suggest two differences between fibrinogen and fibrin.
_
DNA is a very important molecule in living organisms as it carries the genetic code.
Before a cell divides, the DNA molecule replicates so that each resulting daughter cell
is genetically identical to the original parent cell.
Explain the nature of the genetic code.
Describe the process of DNA replication.
_
Flatworms do not have a heart or a circulatory system.
Explain why many animals need a heart and a circulatory system.
_
 The phospholipid bilayer plays an important role in this control of movement of
molecules.
Explain why the phospholipid molecules form a bilayer.
_
Explain why the Davson-Danielli model does not support our current
knowledge of how molecules can move through the cell membrane.
_

BIOLOGY:

- Blankets the investigation of all the living creatures and their collaborations into the biosphere.

Additionally, research the natural elements that encompass the living creatures; and, by method for moderation, it looks for more viable approaches to comprehend the varieties or new states of the environment that can debilitate the presence of living creatures on our planet.
_

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