CIE Biology Paper-4: Specimen Questions with Answers 13 - 17 of 120

Passage

Enzymes are large biomolecules that are responsible for many chemical reactions that are necessary to sustain life.

Question number: 13 (3 of 4 Based on Passage) Show Passage

One Liner Question▾

Write in Brief

What are the examples of allosteric enzymes and zymogens?

Explanation

Allosteric enzymes:

  • Glycogen phosphorylase
  • Aspartate transcarbamyolase

Zymogens:

  • Angiotensinogen
  • Trypsinogen
  • Chymotrypsinogen
  • Pepsinogen

Question number: 14 (4 of 4 Based on Passage) Show Passage

One Liner Question▾

Write in Brief

In which condition of pH, enzymes can act better?

Explanation

Many enzymes act better in pH of six and eight.

Question number: 15

One Liner Question▾

Write in Brief

What are the main negative impacts of monocultures?

Explanation

Crop plants are mainly grown as big area of a single variety. This is called a monoculture. The main negative impacts of monoculture are-

  • There is a high biodiversity found in natural ecosystem but it decreases in monocultures because in a monoculture only a few species are survive where the crop is growing.
  • Monocultures increase in the populations of organisms that are pest of that particular crop. E. g. If a leafhopper use rice plant. it will able to reduce its yields.
  • When insecticides are used to kill the pest many useful insects are also kill by spraying of insecticides.

Passage

Figure shows the blood cell under the light microscope,

Figure shows the blood cell

Figure Shows the Blood Cell

Figure shows the blood cell under the light microscope, identify White and red blood cells.

Question number: 16 (1 of 2 Based on Passage) Show Passage

One Liner Question▾

Write in Brief

Identify White and red blood cells.

Explanation

in image of the blood cell

In Image of the Blood Cell

Figure shows the blood cell under the light microscope

Question number: 17 (2 of 2 Based on Passage) Show Passage

One Liner Question▾

Write in Brief

Write down the functions of RBC and WBC

Explanation

1. Red blood cells: Red due to hemoglobin, which carries oxygen and transports it to the tissues.

2. White blood cells: White blood cells bigger than RBC. Fights infection by phagocytosis and antibody production.