Biology
Which molecule carries most hereditary information in living organisms?
What is DNA?
Balance the following equation: Al+O2→Al2O3
What is 4Al+3O2→2Al2O3
What is the SI unit of force?
What is the Newton (N)?
Solve simultaneously: 2x+y=11 and x−y=1.
What is x=4, y=3?
A bat and ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?
What is $0.05?
Which organelle is the main site of aerobic respiration in eukaryotic cells?
What is the mitochondrion?
What is the chemical formula of calcium hydroxide?
What is Ca(OH)2?
An object travels 150 m in 10 s at constant speed. Calculate its speed.
What is 15 m s⁻¹?
Solve log3(x−1)=2.
What is x = 10?
What is the largest organ in the human body?
The skin
Which blood cells help the body fight infections?
What are white blood cells?
Which has the larger atomic radius: sodium or chlorine?
Sodium
What type of energy does a moving object possess?
What is kinetic energy?
The first term of an arithmetic sequence is 7 and the common difference is 4. What is the sum of its first 20 terms?
What is 900?
Which gas makes up approximately 78% of Earth's atmosphere?
What is nitrogen?
In a monohybrid cross between two heterozygous individuals (Aa × Aa), what is the probability of an offspring being homozygous recessive?
What is 25%?
How many moles are present in 11 g of CO₂? (Molar mass = 44 g mol⁻¹.)
What is 0.25 mol?
Why do passengers tend to move forward when a moving car suddenly brakes?
What is inertia?
How many positive factors does 72 have?
What is 12?
You shuffle a standard deck of 52 cards. What is the probability that two cards drawn consecutively, without replacement, are both aces (express your answer in fractions)?
What is 1/221?
Explain why an enzyme-catalysed reaction rate decreases when the temperature rises far above the enzyme's optimum
What is denaturing?
25.0 mL of 0.100 M HCl neutralizes 20.0 mL of NaOH. What is the molarity of the NaOH solution?
What is 0.125 M?
A ball is dropped from a height. Ignoring air resistance, what happens to its gravitational potential energy and kinetic energy as it falls?
What is gravitational potential energy decreases and kinetic energy increases?
Find the equation of the tangent to y=x2+3x at x=2.
What is y=7x−4.
At a party, every person shakes hands with every other person exactly once. If there are 15 people, how many handshakes occur?
What is 105?