top of page

The chemical basis for life

Answer key

1. Most of an organism's cells are made up of water

A. True - answer

B. False

 

Answer Explanation: Most of an organism cells are made up of water. The average human body is up to 65% water.

​

 

2. At what temperature does liquid freeze?

A. 13℉

B. 4℉

C. 27℉

D. 32℉ - answer

 

Answer Explanation: Water freezes at thirty-two degrees Fahrenheit

 

3. Water staying on the tip of a pine needle after it rained is an example of which of the following?

A. cohesion

B. adhesion - answer

C. photosynthesis

D. hydrolysis

​

 

Answer Explanation: Cohesion is when similar molecules stick together and Adhesion is when dissimilar molecules stick together. An example of adhesion is water staying on the tip of a pine needle after its rained.

 

 

4. Explain the differences between cohesion and adhesion

​

Answer Explanation:

Cohesion is when similar molecules stick together and Adhesion is when dissimilar molecules stick together.

   

5. Explain what happens during a chemical reaction

 

Answer Explanation: Other types of macromolecules and nucleic acids and proteins. Nucleotides adenine, cytosine, guanine, thymine, and uracil make DNA and RNA strands hydrogen bonds hole these strands together.

bottom of page