Formula sheets, the key method steps for every topic and 16 practice problems, with full solutions at the back.
“I watched as Mrs. Grey slowly climbed the steps, stopping on each one to catch her breath. ‘She’s getting older,’ I thought sadly.” From which point of view is the story told?
“The ward needs at least one nurse for every four patients. Tonight there are 22 patients.” What is the smallest number of nurses needed?
Which fraction or mixed number in lowest terms equals the decimal 0.45? Click it.
In a 20% off sale, a stethoscope costs $208. What was the original price x, in dollars?
Which nerve supplies the diaphragm?
A large central disc prolapse at L4–L5 causes saddle anaesthesia, urinary retention and bilateral leg weakness. Which structure is compressed?
Low plasma albumin, as in severe liver disease, causes oedema mainly because:
Why does a deep sea diver risk decompression sickness when surfacing quickly?
The results of an experiment do not support the hypothesis. What should the scientist do next?
The rate of an enzyme reaction rises as substrate is added but then levels off, even when more substrate is added. Why?
What kind of bond is found in a molecule of oxygen gas, O₂?
The reaction 2SO₂ + O₂ ⇌ 2SO₃ reaches equilibrium. What is true at equilibrium?
Which sentence refers correctly to the whole Jones family?
Which revision makes it clear that the nurse, not the boy, was smiling? “The nurse gave a sticker to the boy with a smile.”
Choose the meaning of the word in bold: “The child had an abscess on her arm.”
Choose the meaning of the word in bold: “The X-ray showed a comminuted fracture of the tibia.”
Answer: A · First person, by a narrator who observes
The narrator uses “I” and shares their own thoughts while watching Mrs. Grey, so it is first person told by an observer. We never get Mrs. Grey’s own thoughts.
Answer: D · 6
22 ÷ 4 = 5.5. Five nurses would cover only 20 patients, so at least 6 nurses are needed.
Answer: 9/20
Fractions, decimals and percents are three ways to write the same number. Fraction → decimal: divide the numerator by the denominator. Decimal → percent: multiply by 100 (move the point two places right). Percent → decimal: divide by 100. Decimal → fraction: write the digits over 10, 100 or 1000 (one zero per decimal place) and simplify.
Answer: x = 260 $
Reverse percentages: when a value has already been increased or decreased by a percent, the new value is a percent of the original, not the other way round. After a 20% discount the price is 80% of the original, so original = new price ÷ 0.80. Never add the 20% back on to the new price.
Answer: A · Phrenic nerve
The phrenic nerve (roots C3–C5) is the motor supply to the diaphragm. High cervical cord injury above C3 therefore stops spontaneous breathing.
Answer: C · Cauda equina
Below L1–L2 the canal holds the cauda equina. Central compression of these lumbar and sacral roots causes cauda equina syndrome, a surgical emergency.
Answer: D · Plasma oncotic pressure falls
Albumin generates most of the plasma oncotic pressure that pulls fluid back into capillaries. When it falls, more fluid stays in the tissues.
Answer: B · Nitrogen dissolved at high pressure forms bubbles as the pressure falls
At depth more nitrogen dissolves in the tissues. If pressure falls too fast it comes out of solution as bubbles in tissues and blood, causing "the bends".
Answer: A · Revise the hypothesis and test it again
Results that do not support a hypothesis are reported honestly. The scientist then revises the hypothesis or forms a new one and designs further tests.
Answer: A · All the active sites are occupied
At high substrate levels every active site is in use, so the enzyme is saturated and works at its maximum rate. Only adding more enzyme would raise the rate further.
Answer: D · A nonpolar covalent double bond
Two identical atoms share electrons equally, so the bond is nonpolar covalent; in O₂ two pairs are shared, making a double bond.
Answer: D · The forward and reverse reactions continue at equal rates
At equilibrium both reactions still happen at the same rate, so the concentrations stay constant, but they are not necessarily equal.
Answer: A · The Joneses are coming to dinner.
To make a family name ending in s plural, add -es: the Joneses. An apostrophe never makes a plural.
Answer: A · With a smile, the nurse gave a sticker to the boy.
Placing “With a smile” next to “the nurse” shows who was smiling. C suggests the sticker had a smile, and D still describes the boy.
Answer: C · A collection of pus in the tissues
An abscess is a swollen, painful pocket of pus caused by infection.
Answer: A · Broken into several pieces
A comminuted fracture is one in which the bone is shattered into three or more fragments.
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