📝 MDCAT Practice Quiz
Test your concepts with these daily entry test questions. Check explanations instantly!
Q1: Which of the following organelles is responsible for cellular respiration and energy production in cells?
Correct Answer: B
Mitochondria are known as the powerhouses of the cell because they generate most of the cell’s supply of adenosine triphosphate (ATP), used as a source of chemical energy.
Mitochondria are known as the powerhouses of the cell because they generate most of the cell’s supply of adenosine triphosphate (ATP), used as a source of chemical energy.
Q2: The rate of a chemical reaction generally increases with a rise in temperature because:
Correct Answer: B
An increase in temperature raises the kinetic energy of the molecules, leading to a higher frequency of effective collisions with energy greater than or equal to the activation energy.
An increase in temperature raises the kinetic energy of the molecules, leading to a higher frequency of effective collisions with energy greater than or equal to the activation energy.
Q3: A ball is thrown vertically upwards. At the highest point of its flight, its velocity and acceleration are:
Correct Answer: C
At the maximum height, the ball momentarily stops, so its velocity is zero. However, gravity is still acting on it continuously, so acceleration remains equal to g (downwards).
At the maximum height, the ball momentarily stops, so its velocity is zero. However, gravity is still acting on it continuously, so acceleration remains equal to g (downwards).
