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(a) Outline the chromosome changes during prophase I of meiosis. (b) Describe processes performed by enzymes that bind to DNA. (c) Explain how environmental conditions can affect DNA and its expression in living organisms.
Suggest why adults consume some very large prey but do not eat the intermediate-size prey.
Explain how a food-provisioning behaviour of this kind could evolve.
Which description identifies an organism’s proteome? A. All proteins it expresses B. All nucleotide sequences in its chromosomes C. Only amino acids that cannot be synthesized D. Only the folded shape of one enzyme
(a) Describe protein structure, distinguishing shared features from features that can vary. (b) Explain how proteins enable substances to move across cell membranes.
(a) Explain how vesicles move materials within cells and across their surfaces. (b) Describe how dissolved carbon compounds are transported through phloem. (c) Outline how material moves from the stomach to the large intestine.
During a cycling exercise test, a participant’s ventilation increases as metabolic activity rises. Explain how the brain controls breathing.
A purified enzyme is tested at a fixed concentration, pH and temperature. Product is measured over very short initial intervals. Why does increasing substrate cease to raise the rate appreciably? A. The enzyme has become the main substrate B. Almost all active…
(a) Outline how fruit-fly crosses can investigate inheritance and what such experiments can reveal. (b) Describe methods used in cladistics and uses of the resulting evidence.
(i) Identify the relationship between migration distance and plumage darkness. (ii) Suggest two explanations for variation in plumage other than mate choice.