Warm Up 2/9 2/11

The leaf cells of green plants usually contain chloroplasts. The root cells of green plants do not usually contain these structures, or contain fewer of them. Which statement best explains why

• Root cells eject organelles to make space for water and nutrients to pass through the roots

• Root cells are simpler and do not need energy to perform their specialized functions

• Leaf cells are large enough to contain chloroplasts, but root cells are not

• Leaf cells are the primary site for light-dependent chemical reactions

The diagram shows a microscopic view of a maple leaf. What type of cell is indicated by label B?

• An epidermal cell

• a guard cell

• a stomata

• a nucleus

Eliza wants to increase the yield of her herb garden. A friend suggests that she pinch off the tops of the plants as they grow. Which fact about the apical meristem makes this a good suggestion?

• Enzymes in the apical meristem carry out DNA replication

• Photosynthesis takes place in the chloroplasts of green plant cells

• Auxins produced in the apical meristem inhibit the growth of lateral buds

• The apical meristem uses ATP as its energy source

Amino acids have similar structures. What part of the amino acid's molecular formula distinguishes the macromolecule from other amino acids?

• the R-group

• the amino group

• the carboxyl group

• the nitrogenous base

The graph shows the energy associated with a chemical reaction. The activation energy decreases once a certain type of molecule is added

• Lipid

• Protein

• Nucleic Acid

• Carbohydrate