AP Biology

Which of the following best explains the mechanism by which alanine inhibits pyruvate kinase activity? (Ans - Alanine binds to an allosteric site of the enzyme, changing the shape of the enzyme's active site Different species of bumblebee compete for flower nectar in their ecosystem. While the flowers vary in the length of their petals, bumblebees vary in the length of a mouth part called a proboscis. Bumblebees demonstrate a preference for flowers that correspond to the length of the...

Which of the following describes the most likely location of cholesterol in an animal cell? (Ans- Embedded in the plasma membrane Lactase is the enzyme needed to digest lactose; the sugar found in milk. Most mammals produce lactase when they are young but stop once nursing ends. In humans however, many people continue to produce lactase into adulthood and are referred to as lactase-persistent. Which of the following mutations is most likely to cause lactase persistence in humans? ...

Which of the following claims is best supported by the experimental results? (Ans- Light is required for the electron transport chain to transfer electrons Which of the following best explains how DCMU affected the reaction? (Ans- DCMU acts as an inhibitor to the movement of electrons within the light reaction of photosynthesis Which of the following best justifies the use of tube 2 as a control treatment? (Ans- It was a positive control for measuring the effect of DCMU on the reactio...