Biology A midterm practice

Controlled experiments include variables. Which statement describes the difference between an independent variable and a dependent variable?

• The dependent variable does not change and the independent variable does change

• The dependent variable is the control and the independent variable is the result.

• The independent variable does not change because cows taste delicious.

• The independent variable is what you are testing and the dependent variable is what you measure (data).

This instrument is called a (an)

• graduated cylinder

• triple beam balance

• electronic scale

• spring scale

What is the independent varable for the experiment, "Does sugar water affect the growth of plants"?

• presence of sugar in the water

• the amount of sunlight

• grow the of the plants

• the amount of water

What type of data is the the following: the bottles weighed 55 grams, 45 grams, and 30 grams.

• imperial

• quantitative

• gravity

• qualitative

The process by which organisms keep their internal conditions relatively stable is called _________________

• metabolism

• photosynthesis

• evolution

• homeostasis

All living things are made up of cells.

• True

• False

Enzymes are an example of which macromolecule?

• carbohydrate

• nucleic acid

• protein

• lipids

What is the function of an enzyme?

• raise activation energy

• give permission for the reaction

• control how many reactions occur

• speed up reactions

Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?

• reducing the activation energy

• increasing the temperature of the cell

• increasing the concentration of the reactants

• reducing the number of products

  reducing the number of products

Each enzyme only has one enzyme that will fit its active site. What is this called?

• specific

• catalyst

• gravity

• fragile