Biology Exam Review

What is the maximum number of single covalent bonds a carbon atom can form with other elements?

4

What is the main difference between an ecosystem and a community?

A community consists of living organisms only, while an ecosystem consists of both living organisms and their nonliving environment.

What does the word theory mean to a scientist?

A hypothesis that has been supported by a large number of experiments

Which form of transport requires the expenditure of energy?

Active transport

Organic compounds are distinguished by molecules that contain ____ bonded to other elements

Carbon

What harvests energy from sunlight to rearrange molecules into sugar?

Chloroplasts

When water melts from a solid ice cube to a liquid, its volume ____ and its mass _______.

Decreases; stays the same

The long extension of a cell that can propel a cell forward by whipping back and forth (such as human sperm) is called a _______

Flagellum

If you were looking at a cell under a powerful microscope, what would tell you that it is a eukaryotic cell?

It has a nucleus

Which cellular structure is unique to animal cells?

Lysosome

What is typically the first step in the scientific method?

Making an observation

The statement, "There are 628 gray squirrels living on campus," describes the _____ of gray squirrels on campus.

Population

What passes through the nuclear pores?

RNA

Which of the following molecules is solid at room temperature?

Saturated fats

Which of the following is NOT a characteristic of life?

The ability to move

What is an accurate description of the plasma membrane?

Two layers of phospholipids with a number of proteins embedded within

The scientific method is

a rough recipe for answering questions, but the steps need not always need to be performed in the same order.