Chemistry of Life - Assessment

1.

Multiple Choice

1 min

1 pt

Large bodies of water, such as lakes and oceans, do no quickly fluctuate in temperature. What is the reason behind this phenomenon?

Water is an acid

Water has a high heat capacity

Water is a universal solvent

Water acts as a base

2.

Multiple Choice

1 min

1 pt

Water is essential for life. Its special properties make water the single most important molecule in plant life. Which of the following properties of water enables it to move from the roots to the leaves of plants?

Water expands as it freezes

Water is an excellent solvent

Water exhibits cohesive behavior

Water is able to moderate temperature

3.

Multiple Choice

1 min

1 pt

Why does water move from the roots to the leaves of plants?

Water is pushed by solutes

Water is pulled by gravity

Capillary action pulls the water molecules like a chain

Water's cohesion causes it to "pull" towards the leaves

4.

Multiple Choice

1 min

1 pt

What property of water helps to moderate Earth’s temperature and even our constant internal body temperature?

Cohesion

Adhesion

Density

Specific heat capacity

5.

Multiple Choice

1 min

1 pt

A water strider can skate along the top of a pond because:

Low surface tension of water

Hydrogen bonds result in water cohesion (surface tension)

Covalent bonds result in water cohesion

Water striders have adapted to take advantage of water cohesion

6.

Multiple Choice

1 min

1 pt

Why does ice stay at the top of oceans instead of sinking to the bottom?

Ice is colder than liquid water

Ice is less dense than liquid water

Ice is more dense than liquid water

Ice is warmer than liquid water

7.

Multiple Choice

1 min

1 pt

Water is often called the “universal solvent” because many substances can be dissolved in water. What property of water allows it to be such a universal solvent?

Purity

Polarity and cohesion

High heat capacity

Expansion upon freezing

8.

Multiple Choice

1 min

1 pt

Any compound that removes H+ ions to an aqueous solution and measures more than 7 on the pH scale:

Base

Solvent

Acid

Solute

9.

Multiple Choice

1 min

1 pt

Why does ice float?

As water freezes, it expands and its density decreases.

As water freezes, air becomes trapped between the hydrogen bonds of water molecules.

As water freezes, it takes up more hydrogen from the atmosphere, causing it to have greater buoyancy (floating ability).

As water freezes, it takes up more oxygen from the atmosphere, causing it to have greater buoyancy.

10.

Multiple Choice

1 min

1 pt

Substance in a solution that dissolves the other substance and is present in the greater amount:

Solute

Acid

Solution

Solvent

11.

Multiple Choice

1 min

1 pt

The ability of water molecules to stick together is called:

Adhesion

Cohesion

Transpiration

Solvency

12.

Multiple Choice

1 min

1 pt

Water is polar because:

The molecule has two poles, at which it is colder than the other regions of the molecule.

The water molecule is neutral

The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.

The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.

13.

Multiple Choice

1 min

1 pt

The bonds within a water molecule are:

Polar covalent

Hydrogen

Ionic

Non-polar covalent

14.

Multiple Choice

1 min

1 pt

Any compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale:

Acid

Base

Solvent

Solute

15.

Multiple Choice

1 min

1 pt

Which of the following is a function of a carbohydrate?

Provides long term energy to body

Supports the body in building structures necessary for survival

Provides short term energy to the body

Gives the body instructions for how to build our body's structures

16.

Multiple Choice

1 min

1 pt

Which of the following best describes a situation where the body needs more protein?

When in need of energy for sprinting

When weight lifting

When in need of energy for a marathon

17.

Multiple Choice

1 min

1 pt

How can you tell the difference in the structure of carbohydrates and lipids?

Both have Carbon, Hydrogen, and Oxygen. Carbohydrates have ring structures and Lipids have line structures

Both have Carbon, Hydrogen, and Oxygen. Lipids have ring structures and Carbohydrates have line structures

Carbohydrates have more carbon than Lipids

Both have Carbon, Hydrogen, and Oxygen. Lipids additionally have Nitrogen

18.

Multiple Choice

1 min

1 pt

A scientist is analyzing different biomolecule structures. They notice an influx of Phosphorus. Which biomolecule are they looking at?

Lipids

Protein

Carbohydrate

Nucleic Acid

19.

Multiple Choice

1 min

1 pt

Which of the following best compares the structures of lipids and carbohydrates?

Both are made up of monosaccharide monomers, but lipids are hydrophobic and carbohydrates are hydrophilic.

Both consist of carbon, hydrogen, and oxygen, but carbohydrates have repeating structural units and lipids do not.

Both contain carbon and hydrogen, but carbohydrates also contain oxygen and lipids contain nitrogen.

Both have a carbon backbone, but lipids also have an amino group and carbohydrates have a carboxylic acid group.

20.

Multiple Choice

1 min

1 pt

Some proteins catalyze biochemical reactions. If a genetic defect prevented a protein catalyst from being produced, which of the following do you predict would happen in the cell?

The cell would find a different type of protein to catalyze the reaction.

The reaction the protein catalyzes would proceed very slowly or not at all.

The reaction the protein catalyzes would only occur in some places in the cell.

The reverse reaction of the one the protein catalyzes would begin to proceed.

21.

Multiple Choice

1 min

1 pt

As food travels through the digestive system, it is exposed to a variety of pH levels. The stomach has a pH of 2 due to the presence of hydrochloric acid (HCl), and the small intestine has a pH ranging from 7 to 9. HCl converts pepsinogen into pepsin, an enzyme that digests proteins in the stomach. Which of the following most likely happens to pepsin as it enters the small intestine?

It becomes inactive

It begins to replicate

Its shape changes to engulf large proteins

Its activity increases to ingest more proteins

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