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1.2 What happens in cells (and what do cells need)?

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Question 17

A technician builds three molecular models from DNA components. The components shown in each row are joined in one model.

ModelNumber of sugarsNumber of phosphate groupsNumber of adenine basesNumber of thymine basesNumber of cytosine basesNumber of guanine bases
A10101234
B1093124
C9102215
a.

Explain which model could be one complete strand of DNA.

[2]
b.

The bases in model A pair with bases to form a second strand. Calculate the number of each type of base in the second strand.

[2]
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1.2 What happens in cells (and what do cells need)? Questions

  1. GCSE
  2. /Biology
  3. /1.2 What happens in cells (and what do cells need)?

184 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.

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