In genetics, what is the probability of producing a homozygous recessive offspring from two heterozygous parents?

• 0%

• 25%

• 50%

• 75%

Which of the following best describes the effect of increasing the concentration of reactants on the rate of a chemical reaction?

• It decreases the rate of reaction.

• It has no effect on the rate of reaction.

• It increases the rate of reaction.

• It changes the equilibrium position of the reaction.

Which of the following best explains why certain cells in the human body can produce insulin while others cannot?

• All cells have the insulin gene, but only certain cells express it.

• Only certain cells have the insulin gene.

• Insulin is produced by all cells but only secreted by certain cells.

• Insulin is produced by all cells but only activated in certain cells.

A light ray passes from air into a medium with a higher refractive index. Which of the following statements is true about the light ray?

• It speeds up and bends away from the normal.

• It slows down and bends towards the normal.

• It speeds up and bends towards the normal.

• It slows down and bends away from the normal.

Which of the following best explains why water has a high specific heat capacity?

• Water molecules form hydrogen bonds with each other.

• Water molecules have a high molecular weight.

• Water molecules are nonpolar.

• Water molecules have a high boiling point.

A satellite orbits Earth in a circular path at a constant speed. Which of the following statements is true about the forces acting on the satellite?

• The gravitational force is balanced by the centrifugal force.

• The gravitational force is balanced by the satellite’s inertia.

• The gravitational force provides the centripetal force needed for circular motion.

• The gravitational force is balanced by the satellite’s velocity.

Which of the following best describes the process of photosynthesis?

• Conversion of chemical energy into light energy

• Conversion of light energy into chemical energy

• Conversion of thermal energy into chemical energy

• Conversion of mechanical energy into light energy

Which of the following processes is responsible for the formation of sedimentary rocks?

• Melting and solidification

• Weathering and erosion

• Heat and pressure

• Crystallization from magma

Which of the following statements is true about a balanced chemical equation?

• The number of molecules is the same on both sides of the equation.

• The total mass of reactants is equal to the total mass of products.

• The number of atoms of each element is the same on both sides of the equation.

• The total volume of gases is the same on both sides of the equation.

A 5 kg object is subjected to a net force of 20 N. What is the acceleration of the object?

• 2 m/s²

• 4 m/s²

• 5 m/s²

• 10 m/s²