AP Biology Practice (Interactive)

Which property of water is most directly responsible for its ability to moderate temperature changes in organisms and their environments?

A protein has the amino acid sequence Ala-Gly-Ser-Arg. Which level of protein structure does this sequence represent?

An enzyme catalyzes a reaction at a rate of 100 units/min at 37 degrees Celsius. When the temperature is increased to 50 degrees Celsius, the rate drops to 20 units/min. Which explanation best accounts for this observation?

Which of the following structures is found in prokaryotic cells but NOT in eukaryotic cells?

A cell with a 2:1 surface-area-to-volume ratio is placed in a hypotonic solution. Compared to a cell with a 6:1 ratio under the same conditions, the cell with the 2:1 ratio will:

During oxidative phosphorylation, the electron transport chain pumps protons from the mitochondrial matrix into the intermembrane space. This creates a proton gradient that is used to synthesize ATP. This process is best described as:

In the light-dependent reactions of photosynthesis, water is split and oxygen is released. The primary purpose of splitting water is to:

A pea plant heterozygous for seed shape (Rr) is crossed with a homozygous recessive plant (rr). What is the expected phenotypic ratio of the offspring?

A researcher crosses two pea plants heterozygous for both seed color (Yy) and seed shape (Rr). Which of the following correctly describes the expected genotypic ratio of the F2 offspring?

A student performs a chi-square test on data from a monohybrid cross of 200 offspring and obtains a chi-square value of 7.20 with 1 degree of freedom. The critical value at p = 0.05 is 3.84. What should the student conclude?