A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively, _____.

Consider the HIV enzyme called protease. The amino acid residues at the active site are highly hydrophobic. In designing a drug that would bind to the active site and jam it, researchers should use a molecule that is _____.

When a potassium ion (K+) moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several cellular structures. Which of the following correctly describes the order in which these structures will be encountered by the ion?

When 10,000 molecules of ATP are hydrolyzed to ADP and i in a test tube, about half as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?

Proteins coded for by nuclear DNA but found within mitochondria move from the cytoplasm into mitochondria using _____.

Mr KV, 64 year old, has presented to their GP with symptoms of breathlessness. He has a past medical history of hypertension and angina. He has no acute chest pain. As part of the investigations the GP has ordered a BNP level. In relation to Serum natriuretic peptides, which statement is CORRECT?

Mr BA has the following blood results: Serum Folate:    11mcg/L               (3.89 – 26.8) Serum B12:         60ng/L                  (191 – 663) The haematologist orders a test for anti-intrinsic antibodies, what is the significance of this test?

The chemiosmotic process in chloroplasts involves the _____.

Which statement relating to anaemia is NOT CORRECT?

Use the following figure to answer the questions below.The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?