18. which polysaccharide is found in cell walls of plants?
19. what is the unifying characteristic of lipids?
20. what are the main types of lipids?
21. what is the difference between saturated and unsaturated fats?
22. where can you find phospholipids?
23. what is the monomer of a protein called?
24. what are the two types of nucleic acids?
25. what are the three parts of a nucleotide?
26. what is the difference between dna and rna?

Question

Accepted Answer

### Question 18
# Brief Explanations:
The polysaccharide in plant cell walls is cellulose, which provides structural support.
# Answer:
Cellulose

### Question 19
# Brief Explanations:
Lipids are unified by being hydrophobic (insoluble in water) due to their non - polar nature from hydrocarbon chains.
# Answer:
They are hydrophobic (insoluble in water).

### Question 20
# Brief Explanations:
The main types of lipids are fats (triglycerides), phospholipids, and steroids (e.g., cholesterol, hormones like estrogen and testosterone).
# Answer:
Fats (triglycerides), phospholipids, steroids

### Question 21
# Brief Explanations:
Saturated fats have single - bonded carbon chains (saturated with hydrogen), are solid at room temp (e.g., animal fats). Unsaturated fats have one or more double bonds in carbon chains, are liquid at room temp (e.g., plant oils), and can be monounsaturated (one double bond) or polyunsaturated (multiple double bonds).
# Answer:
Saturated fats have only single carbon - carbon bonds (max hydrogen), solid at room temp. Unsaturated fats have one or more double carbon - carbon bonds (less hydrogen), liquid at room temp.

### Question 22
# Brief Explanations:
Phospholipids are a major component of cell membranes (plasma membrane and organelle membranes), forming the lipid bilayer.
# Answer:
In cell membranes (plasma membrane, organelle membranes).

### Question 23
# Brief Explanations:
Proteins are polymers made of amino acids, so the monomer of a protein is an amino acid.
# Answer:
Amino acid

### Question 24
# Brief Explanations:
The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
# Answer:
Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA)

### Question 25
# Brief Explanations:
A nucleotide has three parts: a phosphate group, a pentose (5 - carbon) sugar (deoxyribose in DNA, ribose in RNA), and a nitrogen - containing base (adenine, thymine/uracil, cytosine, guanine).
# Answer:
Phosphate group, pentose sugar, nitrogen - containing base

### Question 26
# Brief Explanations:
- Sugar: DNA has deoxyribose, RNA has ribose.
- Bases: DNA has A, T, C, G; RNA has A, U, C, G.
- Structure: DNA is double - stranded (double helix), RNA is usually single - stranded.
- Function: DNA stores genetic info; RNA is involved in protein synthesis (mRNA, tRNA, rRNA) and other roles.
# Answer:
- Sugar: DNA = deoxyribose, RNA = ribose.
- Bases: DNA has T, RNA has U.
- Structure: DNA is double - stranded, RNA is single - stranded.
- Function: DNA stores genetic info, RNA is for protein synthesis.

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Explanation:

Question 18

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Question 19