Drugs
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Medicinal drugs (Antibiotics)
SubtopicMedicinal drugs (Antibiotics) under Drugs for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which of the following is a characteristic of a plasmid?
A.It is part of the main bacterial chromosome
B.It is a small, circular piece of extra-chromosomal DNA
C.It is only found in viruses
D.It is the site of cellular respiration
- 2.
What happens to the ribosomes of a bacterium when it is treated with a protein-synthesis-inhibiting antibiotic?
A.They grow larger
B.They are unable to link amino acids together correctly
C.They turn into vacuoles
D.They start producing lipids instead
- 3.
If an antibiotic has a very high therapeutic index, what does this generally mean?
A.It is very toxic to humans
B.It is much more toxic to the bacteria than to the human host
C.It is very expensive to produce
D.It only works on rare diseases
- 4.
Which of these is a major concern regarding 'last-resort' antibiotics?
A.They are too sweet
B.Bacteria are starting to develop resistance even to these drugs
C.They only work on plants
D.They cause the patient to glow in the dark
- 5.
Which of the following is a symptom of antibiotic misuse in a global context?
A.An increase in the number of infections that are difficult to treat with standard drugs.
B.A decrease in the total number of bacteria found in the world's oceans.
C.An increase in the human population's immunity to all bacterial diseases.
D.The sudden disappearance of the common cold and seasonal flu.
- 6.
In the production of penicillin, what happens during the 'batch' process?
A.A set amount of nutrients is added at the start and the product is harvested at the end.
B.Nutrients are constantly added and penicillin is constantly removed.
C.The fungus is grown in the soil and then transferred to the fermenter.
D.Multiple different species of fungi are grown in the same tank.
- 7.
What is the specific effect of penicillin on a growing bacterial cell?
A.It prevents the formation of cross-links in the peptidoglycan cell wall.
B.It blocks the entry of glucose through the cell membrane.
C.It prevents the bacterial DNA from unzipping during replication.
D.It destroys the flagella, preventing the bacteria from finding food.
- 8.
Which of the following describes 'cross-resistance'?
A.Resistance to one antibiotic that also provides resistance to others in the same class
B.The ability of a bacterium to resist antibiotics and disinfectants at the same time
C.When a human becomes allergic to two different types of antibiotics
D.The movement of resistant bacteria across international borders
- 9.
Which part of the bacterial cell is the target for the antibiotic Vancomycin?
A.The DNA gyrase enzyme
B.The 30S ribosomal subunit
C.The cell wall (inhibiting peptidoglycan synthesis)
D.The mRNA strand
- 10.
In the context of evolution, the development of antibiotic resistance is an example of:
A.Artificial selection by humans
B.Directional natural selection
C.Stabilizing selection
D.Disruptive selection
Download the worksheet for Drugs - Medicinal drugs (Antibiotics) to practice offline. It includes additional chapter-level practice questions.
Misused drugs (Alcohol/Tobacco)
SubtopicMisused drugs (Alcohol/Tobacco) under Drugs for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Why is it dangerous to consume alcohol while pregnant?
A.It makes the baby grow too fast
B.It can cause Fetal Alcohol Syndrome
C.It increases the mother's energy levels too much
D.It has no effect on the fetus
- 2.
Which of these is a short-term effect of drinking alcohol?
A.Liver cancer
B.Slurred speech
C.Permanent memory loss
D.Cirrhosis
- 3.
What is the effect of nicotine on the arteries?
A.It makes them wider
B.It has no effect on them
C.It makes them narrower
D.It makes them more elastic
- 4.
Tobacco tar contains chemicals that cause mutations in cells. What does this often lead to?
A.Better lung function
B.Cancer
C.Faster cell repair
D.Increased energy levels
- 5.
Which of the following is true about the breakdown of alcohol in the human body?
A.It is broken down at a constant rate regardless of how much is consumed
B.It is broken down faster if the person drinks coffee or takes a cold shower
C.The more you drink, the faster the liver enzymes work
D.Women generally metabolize alcohol faster than men
- 6.
Passive smoking refers to breathing in the smoke from others' cigarettes. What is a potential health risk for a non-smoker living with a heavy smoker?
A.Decreased risk of asthma due to exposure
B.Increased risk of developing lung cancer and heart disease
C.Higher levels of vitamin D in the blood
D.Improved lung capacity through 'training'
- 7.
What happens to the body's reaction time when blood alcohol concentration (BAC) increases?
A.The reaction time decreases (becomes faster)
B.The reaction time increases (becomes slower)
C.The reaction time remains the same, but the response is more accurate
D.The reaction time only changes if the person is tired
- 8.
Which of the following describes the effect of nicotine on the release of adrenaline?
A.Nicotine inhibits the adrenal glands, leading to a state of deep relaxation.
B.Nicotine stimulates the adrenal glands to release adrenaline, increasing heart rate and blood pressure.
C.Nicotine mimics adrenaline directly, making the glands unnecessary.
D.Nicotine only affects the brain and has no interaction with the adrenal glands.
- 9.
In the liver, what is the fate of the acetate produced during the metabolism of alcohol?
A.It is excreted immediately by the kidneys.
B.It is converted into Acetyl-CoA and can be used in the Krebs cycle or for lipid synthesis.
C.It is stored in the gallbladder as bile.
D.It is converted back into ethanol if the body needs more energy.
- 10.
What is the biological impact of tar on the gas exchange surface of the alveoli?
A.It dissolves the surfactant, causing the alveoli to collapse.
B.It forms a sticky layer that increases the diffusion distance for gases.
C.It reacts with oxygen to form carbon dioxide before the oxygen can reach the blood.
D.It stimulates the growth of more capillaries to improve gas exchange.
Download the worksheet for Drugs - Misused drugs (Alcohol/Tobacco) to practice offline. It includes additional chapter-level practice questions.