Starting with 10 copies, how many DNA copies are there after 20 PCR cycles (in millions, 3 s.f.)?
Salam Academy Original Practice · Proposed mark scheme
Practise
Question bank
Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.
Sign in to check answers. Your attempts build your mastery and error book.
2730 questions · page 97 of 137 · choose a topic above to narrow them down
Somatic gene therapy differs from germ-line therapy because
Salam Academy Original Practice · Proposed mark scheme
A disadvantage of viral vectors in gene therapy is that they
Salam Academy Original Practice · Proposed mark scheme
Golden Rice was engineered to produce
Salam Academy Original Practice · Proposed mark scheme
Bt maize contains a gene that makes it
Salam Academy Original Practice · Proposed mark scheme
Ultrafiltration happens in the
Salam Academy Original Practice · Proposed mark scheme
The glomerular filtrate does NOT normally contain
Salam Academy Original Practice · Proposed mark scheme
Glucose is reabsorbed in the
Salam Academy Original Practice · Proposed mark scheme
180 dm³ of filtrate and 1.5 dm³ of urine are produced per day. Calculate the percentage of filtrate reabsorbed.
Salam Academy Original Practice · Proposed mark scheme
Cholera is transmitted by
Salam Academy Original Practice · Proposed mark scheme
HIV causes AIDS by destroying
Salam Academy Original Practice · Proposed mark scheme
Penicillin kills bacteria by
Salam Academy Original Practice · Proposed mark scheme
Antibiotics don't affect viruses because viruses
Salam Academy Original Practice · Proposed mark scheme
The variable region of an antibody
Salam Academy Original Practice · Proposed mark scheme
Clonal selection means
Salam Academy Original Practice · Proposed mark scheme
Vaccination gives
Salam Academy Original Practice · Proposed mark scheme
In the link reaction, pyruvate is
Salam Academy Original Practice · Proposed mark scheme
How many molecules of CO₂ are produced per glucose in the link reaction and Krebs cycle together?
Salam Academy Original Practice · Proposed mark scheme
The final electron acceptor in the electron transport chain is
Salam Academy Original Practice · Proposed mark scheme
The oxygen released in photosynthesis comes from
Salam Academy Original Practice · Proposed mark scheme