GED Science Test #9 2

Question 1

The immune system's B cells produce _______ to fight infections.

Accepted Answer

Antibodies

Answer

Antigens

Answer

Enzymes

Answer

Hormones

Question 2

Which gas makes up the largest percentage of Earth's atmosphere?

Accepted Answer

Nitrogen (N₂)

Answer

Oxygen (O₂)

Answer

Carbon dioxide (CO₂)

Answer

Argon (Ar)

Question 3

In which phase of mitosis do chromosomes line up along the center of the cell?

Accepted Answer

Metaphase

Answer

Prophase

Answer

Anaphase

Answer

Telophase

Question 4

A table shows that as temperature increases from 20°C to 60°C, enzyme activity first increases then sharply decreases at 50°C. What is the best explanation for this?

Accepted Answer

High temperatures denature the enzyme, changing its shape

Answer

The substrate runs out at high temperatures

Answer

Enzymes require cold temperatures to function

Answer

Temperature has no effect on enzyme activity

Question 5

Newton's Third Law states that for every action:

Accepted Answer

There is an equal and opposite reaction

Answer

There is an equal reaction in the same direction

Answer

The force depends on the mass of the object

Answer

The acceleration is proportional to the net force

Question 6

Which of the following is a renewable energy source?

Accepted Answer

Solar energy

Answer

Coal

Answer

Natural gas

Answer

Nuclear energy