BMAT Knowledge 2 — Questions and Answers
Question 1: Which enzyme is responsible for unwinding the DNA double helix during replication?
- DNA polymerase
- Helicase (Correct answer)
- Ligase
- Primase
Correct answer: Helicase
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?
- 2.0 L
- 4.0 L (Correct answer)
- 8.0 L
- 16.0 L
Correct answer: 4.0 L
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)?
- +4
- +6 (Correct answer)
- +2
- -2
Correct answer: +6
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)
- 1 s
- 2 s (Correct answer)
- 4 s
- 10 s
Correct answer: 2 s
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?
- DNA replication
- Protein synthesis (Correct answer)
- Lipid metabolism
- ATP production
Correct answer: Protein synthesis
Ribosomes translate mRNA sequences into polypeptide chains during protein synthesis.
Question 6: The number of protons in the nucleus of an element defines its:
- Mass number
- Atomic number (Correct answer)
- Isotope number
- Neutron number
Correct answer: Atomic number
The atomic number equals the number of protons and uniquely identifies each element on the periodic table.
Question 7: In a simple series circuit, if one resistor's resistance doubles while the EMF remains constant, the current will:
- Double
- Halve (Correct answer)
- Stay the same
- Quarter
Correct answer: Halve
By Ohm's law (I = V/R), doubling total resistance while keeping V constant halves the current.
BMAT Knowledge 2
Which enzyme is responsible for unwinding the DNA double helix during replication?