QCEVault

Genetics and heredity — Question 25

Original QCE Vault practice · 1 mark

Q25 · Practice questionSimple familiar1 mark

QUESTION 25

A PCR starts with 3 double-stranded copies of a target region. Assuming ideal doubling in every cycle, how many double-stranded copies are present after 5 cycles?

(A)
15
(B)
30
(C)
96
(D)
243
Question linkSyllabus coverage

Related questions

  1. Q1 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 1 Which base pairs with adenine during DNA replication? (A) uracil (B) guanine (C) thymine (D) cytosine
    Genetics and heredity
  2. Q4 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 4 What is the role of tRNA in protein synthesis? (A) acting as a template strand for mRNA (B) matching amino acids to mRNA codons (C) transporting mRNA from the nucleus to the ribosome (D) providing a copy of genetic instructions for the ribosome
    Genetics and heredity
  3. Q5 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 5 Which option describes the contents of a human cell at metaphase I of meiosis? Number of chromosomes Number of copies of each gene (A) 23 1 (B) 23 2 (C) 46 2 (D) 46 4
    Genetics and heredity
  4. Q10 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 10 In humans, sex-linked recessive traits are more common in (A) males, because they have a Y chromosome. (B) females, because they have two X chromosomes. (C) males, because they have only one X chromosome. (D) females, because they do not have a Y chromosome.
    Genetics and heredity