The Chemical Basis of Life

How many covalent bonds can carbon form?

• 2

• 3

• 4

• 5

Tags

NGSS.HS-PS1-1

What type of carbohydrate is cellulose?

• Monosaccharide

• Disaccharide

• Polysaccharide

• Lipid

How do enzymes increase the speed of chemical reactions?

• reducing the number of products   

• reducing the activation energy

• increasing the temperature of the cell

• increasing the concentration of reactants 

What is the charge of an ion that has gained an electron?

• Positive

• Negative

• Neutral

• Double positive

Where do substrates bind on an enzyme?

• voltage-gated channels

• surface receptor

• calcium channels

• active site

What is a substance called if it speeds up a chemical reaction?

• reusable

• catalyst

• specific

• fragile

Which enzyme is most efficient in a basic solution?

• A

• B

Choose the best alternative that completes the statement or answers the question.

We all understand that earth has carbon-based life.

In reference to the graphic shown, if life arose on a planet where carbon is absent which element might fill the role of carbon.

• nitrogen

• phosphorus

• aluminum

• silicon

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In the term trace element, the modifier trace means

• the element is required in very small amounts

• the element can be used as a fluorescent label to trace elements through an organism's metabolism

• the element is very rare on Earth

• the element enhances health but is not essential for the organism's long term survival

• the element passes rapidly through the organism

Water is formed by a(n)

• non-polar covalent bond

• ionic bonding

• polar covalent bond

• hydrogen bond

Tags

NGSS.HS-PS1-3