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The ultimate source of energy for plants, animals, and humans as well comes from what source?

Photosystems channels the excitation energy gathered by absorption of light by any one of the pigment molecules to a specific reaction center chlorophyll, which in turn passes the energy to

A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour. Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?

absorption spectra.pngBased on a variety of experiments, it is known that the rate of photosynthesis is highest when wavelengths of light between 400 and 500 nm are used, and when wavelengths around 700 nm are used. What does this indicate about the relative importance of chlorophyll a and b in photosynthesis?

Use the image and word bank below to fill in the blanks. oxygen.png  What is the atomic number of oxygen? [BLANK-1] What is the mass number of oxygen? [BLANK-2] The atomic number represents how many [BLANK-3] are in the atom. Which particle(s) is used to determine which element you are looking at? [BLANK-4] How many electrons are in the valence shell of oxygen? [BLANK-5]

What would happen if cells used high heat to try to speed up chemical reactions instead of using enzymes?

Fatty acids belong to which category of biomolecules?

Which of the following structures is only found in plant cells (not in animal cells)?

Nancy is looking at a sample of cells under the microscope. She notices the cells do not have a nucleus and immediately knows the cells are _______

During a flood, an ant colony can form a raft and float to their new home. This phenomenon can happen because ___. ants.png