BMAT Knowledge 2

Question 1

Which enzyme is responsible for unwinding the DNA double helix during replication?

Accepted Answer

Helicase

Answer

Helicase breaks hydrogen bonds between base pairs to unwind the double helix at the replication fork.

Question 2

A gas occupies 4.0 L at 300 K and 1 atm. What volume does it occupy at 600 K and 2 atm?

Accepted Answer

4.0 L

Answer

Using the combined gas law: V2 = (P1V1T2)/(T2P2) = (1×4.0×600)/(300×2) = 4.0 L.

Question 3

What is the oxidation state of sulfur in sulfuric acid (H₂SO₄)?

Accepted Answer

+6

Answer

With hydrogen at +1 and oxygen at -2, the equation 2(+1) + S + 4(-2) = 0 gives S = +6.

Question 4

A ball is thrown vertically upward with initial velocity 20 m/s. How long does it take to reach maximum height? (g = 10 m/s²)

Accepted Answer

2 s

Answer

At maximum height, final velocity = 0; using v = u − gt gives t = 20/10 = 2 s.

Question 5

Which of the following best describes the role of ribosomes in the cell?

Accepted Answer

Protein synthesis

Answer

Ribosomes translate mRNA sequences into polypeptide chains during protein synthesis.

BMAT - Assessment Practice Test