IGCSE Biology Paper-2: Specimen Questions with Answers 193 - 194 of 203

Question 193

Edit

Question

MCQ▾

Which statement is correct for all catalysts?

Choices

Choice (4)
a.They are proteins.
b.They slow down chemical reaction.
c.They speed up chemical reactions.
d.They are present in living organisms only.

Answer

c.

Explanation

  • A catalyst is a substance that can be added to a reaction to increase the reaction rate without being consumed in the process.
  • Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.
  • Enzymes are proteins that act as catalysts in biochemical reactions.
  • Common types of catalysts include enzymes, acid-base catalysts, and heterogeneous (or surface) catalysts.
They speed up chemical reactions

They Speed up Chemical Reactions

Loading image

Question 194

Edit

Question

MCQ▾

Which organ is most commonly damaged by regularly drinking too much alcohol?

Choices

Choice (4)
a.Heart
b.Liver
c.Pancreas
d.Kidney

Answer

b.

Explanation

  • The liver breaks down most of the alcohol you drink so that it can be removed from the body.
  • This creates substances that are even more harmful than alcohol. These substances can damage liver cells and cause serious liver disease. Alcohol causes 4 out of 5 deaths from liver disease.

Types of liver disease caused by alcohol include:

  • Fatty liver (steatosis)
  • Inflammation of the liver (hepatitis)
  • Acute alcoholic hepatitis
  • Scarring of the liver (cirrhosis)
  • Liver failure and death