Unit 3

A researcher claims that increased atmospheric carbon dioxide levels caused increased growth rates in plants?

Atmospheric carbon dioxide is the raw material for photosynthesis, which plants rely on for producing sugars and other organic compounds.

Butterflies of the genus Colias live in the Rocky Mountains, where they experience a wide range of temperatures. Different variants of a particular glycolytic enzyme in the flight muscles are optimally active at different temperatures. Within the same population, some individual butterflies fly most effectively at 29 C° , while others fly most effectively at 40°C. Still others can be equally active at both temperatures. Which of the following claims is most consistent with the observed butterfly behavior?

Butterflies that express two variants of the enzyme are active over a greater range of temp

(figure illustrating ATP synthesis in mitochondria and chloroplasts) The figures can best assist in answering which of the following questions?

Do electron transport chains create a gradient so that so that ATP synthase can generate ATP molecules?

The chemical reaction for photosynthesis is 6CO2+12H20+light energy ---> C6H12O6+6O2+6H2O... Which of the following is the most likely explanation?

During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released

A researcher claims that different metabolic pathways allow bacteria to use diff. molecules as sources of matter and energy. Which of the following statements best helps justify the researchers claim by providing a relevant example?

E. coli bacteria reproduce in liquid media containing either glucose or gatactose

Which metabolic process is common to both aerobic cellular resp. and alcoholic fermentation?

Glycolysis

PFK can be allosterically inhibited by ATP at high concentrations. Which of the following is the benefit of regulating glyclosis by the concentration of ATP?

Glycolysis is inhibited when the intracellular conc. of ATP is high bc ATP ill compete...

An intermediate electron acceptor for oxidations that occur in both glycolysis and in Krebs cycle reactions

NAD+

In addition to the pigments commonly associated w photosynthesis, a certain photosynthetic species contains two additional pigments.

The additional pigments allow the species containing them to harvest energy from wavelengths of light that the other photosynthetic species cannot use.

Which of the following is an important difference between light dependent and light ind. reactions of photosynthesis?

The light dependent reactions produce ATP and NADPH; the light ind. reactions use energy stored in ATP and NADPH

Which of the following statements best helps explain the reaction specificity of an enzyme?

The shape and charge of the substrates are compatible with the active site of the enzyme.

ATP serves as a common energy source for organisms because

its energy can be easily transferred to do cellular work

(table of hydrogen peroxide solution) If the potato was boiled for 10 mins and cooled for 10 mins...

more than 30 secs