General Science Class 9 MCQS

During metaphase homologous chromosomes arrange themselves on the :

1. Poles of the spindle
2. Equator of the spindle
3. Center of the cell
4. Randomly in the cytoplasm

Cell death which is caused by external factor called :

1. Apoptosis
2. Autolysis
3. Necrosis
4. Mitosis

Sequence of changes which occurs between one cell division and the next is called?

1. Mitosis
2. Meiosis
3. Half cycle
4. Cell cycle

There are ____ types of metabolic reactions.

1. Two
2. Four
3. Three
4. Five

Enzymes catalyze chemical reaction by _____ the activation energy.

1. Raising
2. Lowering
3. Maintaining
4. Ignoring

Presence of enzyme does not affect the nature or properties of :

1. Reactants
2. Reaction rate
3. End products
4. Activation energy

In constructive reaction _____ molecules are formed.

1. Small
2. Medium
3. Equal
4. Large

Activity of enzymes can be enhanced by :

1. Activator
2. Inhibitor
3. Substrate
4. Coenzyme

Small portion of enzyme where substrate attach with enzyme called :

1. Binding site
2. Active site
3. Catalytic site
4. Substrate site

Enzyme activity decreased by :

1. Activator
2. Substrate
3. Inhibitor
4. Coenzyme