Bio ch 2

What is the smallest unit of life?

A cell

Which of the following is the correct organizational hierarchy, from largest to smallest, in the hierarchical order of life? (Some levels have been omitted, so you are looking for the correct order.)

Ecosystem → Community → Population → Organ → Tissue → Cell → Molecule → Atom

Fire can move, grow, reproduce, use energy, consume oxygen, and interact with its environment. Why is it not alive?

It does not have cells. It does not consist of complex, well-ordered structures. It does not pass on genes for traits to its offspring. all of the above

Which of the following statements cannot be tested by science?

It is wrong that male lions kill baby lions when taking over a new pride.

. How is life defined?

Life is defined through a set of shared characteristics that all living things display.

Is a virus alive?

No, it does not possess all of the requirements for life.

What is typically the first step in the scientific method?

Observation

What is the most common element in your body?

Oxygen

Which would have the highest concentration of C—H bonds?

Saturated fat

Skin is sometimes referred to as the largest organ of the body. Why is skin considered to be an organ and not a tissue or some other structure?

Skin consists of multiple tissue types that cooperate to perform a specific task.

What might happen if a protein has a change in one amino acid?

The amino acid chain folds incorrectly. The protein has a new shape. The protein can no longer function properly.

A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?

The cohesion of water molecules to each other

Identify the part of the atom that most determines the chemical properties of the atom.

The number of electrons

Which of the following represents a blind study?

The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do.

Oil hydrogenation can produce a product, such as vegetable shortening or margarine, that is spreadable at room temperature because of an unusual bond that does not occur naturally. What is the name of this category of lipid?

Trans fat

Something with a pH of 5 would be ________.

acidic

A college campus — including the students, birds, trees, sidewalks, and air — makes up one complete ________.

ecosystem

Water is the least dense when it ________.

freezes

Enzymes are a type of ________.

protein