Biology Quiz

What is the importance of photosynthesis to organisms other than plants?

• All other organisms require carbon dioxide for life processes.

• The sugars made during photosynthesis are the direct building blocks of DNA.

• All cells must contain chloroplasts in order to survive.

• Photosynthesis captures energy that other organisms access when they ingest or absorb nutrients from photosynthetic organisms.

Photosynthetic organisms capture energy from sunlight and convert it into chemical bonds by forming

• sugars.

• enzymes.

• work.

• substrates.

What type of reactions release energy by breaking down molecules?

• catabolic

• anabolic

• photosynthetic

• dehydration synthesis

The capture and use of energy by living organisms involves numerous chemical reactions. Collectively these processes are known as

• metabolism.

• respiration.

• anabolic reactions.

• catabolic reactions.

Chemical reactions that break down lipids are

• catabolic.

• anabolic.

• metabolic.

• respiration.

Some kinds of drain cleaners use enzymes rather than strong, more dangerous chemicals. These enzymes must be able to

• catalyze a catabolic reaction.

• raise the energy of the reaction that clears the clog.

• create energy that can be used to break up the clog.

• catalyze an anabolic reaction.

Which of these molecules carries the most energy?

• ADP

• ATP

• free phosphate

• NAD+

Which of the following is either consumed or synthesized in virtually every cellular reaction?

• sugars

• enzymes

• DNA

• ATP

When ATP breaks down into ADP and a phosphate group,

• energy is absorbed by ADP and transferred to enzymes.

• energy is released and can power cellular activities.

• ADP becomes the active site in an enzyme.

• the energy in the broken bond is transferred to the phosphate group.

Cells contain the molecule GTP (guanosine triphosphate). Would this molecule be useful as an energy carrier (similar to ATP)?

• no, because it does not contain the adenosine necessary for storing energy

• no, because it contains fewer phosphate groups than ATP

• yes, because it contains a nitrogenous base just like ATP

• yes, because it contains the same number of phosphate groups as does ATP