A-Level BiologyYear 2018Q8
page 06 8. A sample of 106 cells was found to contain 0·4 mg protein. Actin comprises 4·5% of the total protein. 42 g of actin contains 6·02 × 1020 molecules. 1 g = 1000 mg The number of actin molecules per cell is A 2·58 × 108 B 2·58 × 1010 C 2·58 × 1011 D 2·58 × 1014 9. An outcome of the activation of a cell’s thyroid hormone receptors by thyroxine is A decreased production of Na/KATPase B increased production of Na/KATPase C decreased metabolic rate D opening of ligand-gated ion channels.
Paper Source:NAH_Biology_all_2018.pdf
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Exam Specification Info
This question is part of the UK A-Level Biology syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
Syllabus levelAdvanced Level (A-Level)
SubjectBiology
Official MarksVariable (2–6 marks)