Exam 1 Test Questions

Lipids serve to

Insulate, protect, and store energy

The type of bond that will form from the transfer of an electron from one atom to another is an

Ionic bond

The term metabolism refers to

All the chemical reactions in a cell

The pH of 3.5 is called

An acid

What does not occur when a sodium atom transfers an electron to a chlorine atom?

They do not share electrons between them

4 categories of biomolecules are

- Carbohydrates - Lipids - Proteins - Nucleic acids

Biological levels from the least to most complex

- Molecule <- least - Cell - Tissue - Organ - Organ system - Organisms <- most

What does occur when a sodium atom transfers an electron to a chlorine atom?

- Sodium becomes a positively charged ion - The positive and the negative ion will attract each other forming a crystal if no water is present - The ions will separate on the presence of water

Oxygen has how many protons?

8 protons and an atomic number of 8

The 4 major classes of biological macromolecules are

Carbohydrates, lipids, proteins, and nucleic acids

The smallest unit of life is a

Cell

Nucleic acids include

DNA and RNA which control our genetic inheritance

An covalent bond occurs when

Electrons are shared between 2 atoms to complete their octate

Carbohydrates are used by the body for

Energy

According to the octate rule an atom is most stable when

Its outer valence shell contains 8 electrons

In animals lipids are used for

Long term energy storage

After spending an hour working in the hot sunny weather, a person perspires (sweats) and drinks water. This is an example of

Mainting homeostasis

RNA and DNA are both examples of a

Nucleic acid

A group of organisms of the same species in a particular area is the

Population

The particles that are found in the nucleus of an atom are the what?

Protons and neutrons

The tiny leaves of a plant close when they are touched is a

Response to their environment

Plants store their sugar in the form of

Starch

Which of the following statements correctly identifies the type of bond found between oxygen and hydrogen in water molecules?

The bond has an unequal sharing of electrons. Polar covalent bonds

You're conducting an experiment that determines if echinacea cures the common cold. What would be the best experimental setup to test this hypothesis?

The experimental group receives a daily dose of echinacea and the control group receives a sugar pill to look like echinacea

A team of researchers are investigating a new carbon rich molecule important to life. They find evidence for the presence of a long carbon hydrogen containing chain that has a double bond between carbon atoms. This observation means that

The new molecule likely exists as an unsaturated fatty acid

Biomolecules that form many functions for many things and are made up of amino acids are called

protein