Cells

The diagram below represents a model of a biological process that occurs in humans at normal body temperature, 37°C. Increasing body temperature to 40°C would interfere most directly with the rate of function of structure

• A) A

•  B) B

•  C) C

• D) D

Structures in an animal cell are represented in the diagram below. Which row in the chart correctly identifies the functions of structures A, B, and C?

• A) 2     

• B) 1

• C) 3

• D) 4

The model below summarizes one pathway of energy transfer in an ocean ecosystem. The type of organism represented by box X could be

• algae

• fungi

• small fish

• sea birds

Organisms living in a forest ecosystem rely on the Sun as a source of energy for metabolic processes. The following events occur as energy is captured by a plant and used in the metabolic processes of an herbivore.

• 1 [A] – [D] – [B] – [C]

• 2 [B] – [A] – [C] – [D]

• 3 [D] – [A] – [B] – [C]

• 4 [D] – [B] – [A] – [C]

X most likely represents

• 1. 1. the nucleus

• 1. 2. the mitochondrion

• 3. sunlight

• 4.carbohydrates

Based on these results, which statement correctly predicts what will happen to red blood cells when they are placed in a beaker containing a water solution in which the salt concentration is much higher than the salt concentration in the red blood cells?

• A) The red blood cells will absorb water and increase in size.

• B) The red blood cells will first lose water, then absorb water, and finally double in size.

• C) The red blood cells will first absorb water, then lose water and maintain their normal size.

• D) The red blood cells will lose water and decrease in size.

Which statement concerning the functioning of cells is correct?

• A. Mitochondria transfer energy from organic compounds to form ATP molecules

• B. Vacuoles are the sites of DNA synthesis.

• C. The nucleus stores genes that will later be removed from the cell.

• D. The cell membrane prevents the diffusion of all poisons into a cell from its environment.

The removal of mitochondria from a typical animal cell would have an immediate effect on the cell's production of

• A. DNA

• B. Oxygen

• C. ATP

• D. Glucose