How many ions does the sodium-potassium pump move per ATP used?
Answer and explanation
Correct answer: B. 3 Na+ out and 2 K+ in, using one ATP per cycle
- Step 1: The pump moves ions against their gradients using ATP. Step 2. Each cycle exports 3 sodium ions and imports 2 potassium ions. Answer: 3 Na+ out and 2 K+ in. Why not the others: The other ratios or directions reverse or change the real stoichiometry.
Practise more Genetics, Molecular Biology, Physiology and Immunity.
Free questions with an explanation for every one, and full timed Wazari Exam (Iraq Baccalaureate) - Scientific Branch mock tests.
More Genetics, Molecular Biology, Physiology and Immunity questions
- Which base pairs with adenine in a DNA double helix?
- Which cell structure is the site of translation?
- A DNA template strand reads 3'-TAC-5'. What is the mRNA codon transcribed from it?
- Two heterozygous parents (Aa x Aa) have children with complete dominance. What is the expected phenotypic ratio?
- A plant with the dominant phenotype is test-crossed with a homozygous recessive plant, and about half of the offspring show the recessive tr…
- A woman who carries an X-linked recessive colour-blindness allele has children with a man with normal vision. What is expected?