TEAS-style science practice: cram pack

Formula sheets, the key method steps for every topic and 8 practice problems, with full solutions at the back.

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1Formulas and methods

Biology for nursing entrance exams

Method

  1. Name the topic of the question: cell parts, transport, division, DNA and protein synthesis, inheritance, biomolecules, microorganisms or experimental design.
  2. Recall the key rule: A–T and G–C, diffusion from high to low, water moves towards more solute, mitosis keeps and meiosis halves the chromosome number.
  3. For crosses, write the parents’ genotypes, list the gametes and fill a Punnett square before counting.
  4. For experiments, label the independent, dependent and controlled variables, and ask whether the evidence supports or only suggests the conclusion.
  5. Check each option against the question asked, not just whether it is a true statement.

Chemistry for nursing entrance exams

Method

  1. Identify what is given and asked: particles, a formula, a state change, a concentration, a pH or a mass.
  2. Use the periodic table: the atomic number gives protons, the group gives valence electrons and the usual ion charge.
  3. Balance equations with coefficients only, element by element, oxygen and hydrogen last.
  4. For amounts, go mass → moles → mole ratio → moles → mass, and for solutions use M = mol/L and C₁V₁ = C₂V₂.
  5. Remember that pH is logarithmic: one unit is a factor of 10.

2Practice problems

1.Human anatomyMedium

The circle of Willis at the base of the brain connects which two arterial supplies?

  1. AExternal carotid and subclavian arterial systems
  2. BLeft and right external carotid arteries
  3. CInternal carotid and vertebrobasilar systems
  4. DJugular and vertebral systems
2.Human anatomyHard

A lesion of the left optic tract causes which visual field defect?

  1. ABitemporal hemianopia
  2. BRight homonymous hemianopia
  3. CBlindness in the left eye only
  4. DLeft homonymous hemianopia
3.Human physiologyMedium

Why is the oxygen–haemoglobin dissociation curve S-shaped?

  1. ARed cells change size as they take up oxygen
  2. BBinding of one oxygen makes the next bind more easily
  3. COxygen dissolves better in plasma at high partial pressure
  4. DHaemoglobin can bind only one oxygen molecule
4.Human physiologyHard

Which mechanism mainly creates the concentration gradient in the medulla of the kidney?

  1. AADH acting on the descending limb
  2. BGlomerular filtration
  3. CSecretion of urea into the proximal tubule
  4. DThe countercurrent multiplier of the loop of Henle
5.Biology for nursing entrance examsMedium

How does an enzyme speed up a chemical reaction?

  1. AIt is used up as a reactant
  2. BIt adds energy to the products
  3. CIt raises the temperature of the cell
  4. DIt lowers the activation energy
6.Biology for nursing entrance examsHard

Volunteers drink 0, 100 or 200 mg of caffeine, and their heart rate is measured after 30 minutes. What is the dependent variable?

  1. AThe volunteers themselves
  2. BThe dose of caffeine
  3. CThe 30-minute waiting time
  4. DThe heart rate after 30 minutes
7.Chemistry for nursing entrance examsMedium

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

  1. AIodine-131 is not radioactive inside the body
  2. BThe thyroid gland takes up iodine to make its hormones
  3. CRadiation is always drawn toward the head
  4. DIodine is strongly attracted to the metal ions stored in the neck
8.Chemistry for nursing entrance examsHard

Which statement about a catalyst in a reversible reaction is correct?

  1. AIt only speeds up the forward reaction and stops the reverse reaction
  2. BIt increases the amount of product at equilibrium
  3. CIt is used up as the reaction proceeds
  4. DIt speeds up both directions equally

3Solutions

1.Human anatomy

Answer: C · Internal carotid and vertebrobasilar systems

Why this is the answer

The circle of Willis links the internal carotid arteries with the basilar artery (formed by the vertebral arteries), allowing some collateral flow.

Answer

C · Internal carotid and vertebrobasilar systems
2.Human anatomy

Answer: B · Right homonymous hemianopia

Why this is the answer

The left optic tract carries fibres from the left half of each retina, which see the right visual field. Its lesion causes loss of the right half of the field in both eyes.

Answer

B · Right homonymous hemianopia
3.Human physiology

Answer: B · Binding of one oxygen makes the next bind more easily

Why this is the answer

Haemoglobin shows cooperative binding: each bound O₂ increases the affinity of the remaining sites, giving a sigmoid curve.

Answer

B · Binding of one oxygen makes the next bind more easily
4.Human physiology

Answer: D · The countercurrent multiplier of the loop of Henle

Why this is the answer

The ascending limb actively transports NaCl into the interstitium without letting water follow, and the countercurrent flow multiplies this into a steep gradient that ADH then uses to concentrate urine.

Answer

D · The countercurrent multiplier of the loop of Henle
5.Biology for nursing entrance exams

Answer: D · It lowers the activation energy

Why this is the answer

Enzymes provide an easier pathway with a lower activation energy. They are not used up and can act again and again.

Answer

D · It lowers the activation energy
6.Biology for nursing entrance exams

Answer: D · The heart rate after 30 minutes

Why this is the answer

The caffeine dose is changed (independent variable); the heart rate is measured (dependent variable); the waiting time is kept constant (controlled).

Answer

D · The heart rate after 30 minutes
7.Chemistry for nursing entrance exams

Answer: B · The thyroid gland takes up iodine to make its hormones

Why this is the answer

The thyroid absorbs iodine to make thyroid hormones and cannot tell radioactive iodine from normal iodine. So iodine-131 collects in the gland, where its radiation can destroy overactive thyroid tissue.

Answer

B · The thyroid gland takes up iodine to make its hormones
8.Chemistry for nursing entrance exams

Answer: D · It speeds up both directions equally

Why this is the answer

A catalyst does not change where the equilibrium lies; it only lets both reactions reach it sooner and is not consumed.

Answer

D · It speeds up both directions equally

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