Biology Ch. 5 HW

Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Not all terms will be used.

When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a dehydration reaction. This reaction forms a(n) peptide bond.

This figure is an example of a(n) _____.

saturated fat

Scan along the standard sequences (O. kisutch, O. keta, and S. salar), base by base, identifying any bases that do not match the sequence from your fish sample. How many nucleotide bases differ between your sample (labeled as O. kisutch) and the standard sequence for O. kisutch?

3

What percentage of the bases in the standard sequence for O. kisutch are identical to your sample? This value is called the "percent identity."

85%

Match the words in the left-hand column with the appropriate blank in the sentences in the right-hand column.

A carbohydrate that yields many monosaccharides when hydrolyzed is a polysaccharide . Lactose, the sugar in milk, is a disaccharide, because it can be split into two monosaccharides A simple sugar is composed of equal parts carbon and water, which gave rise to the general name of any sugar as a carbohydrate . A monosaccharide cannot be hydrolyzed any further.

Which molecule is less soluble in water--a fat or a phospholipid? Why?

A fat molecule is less soluble in water because it has three non-polar fatty acids and no polar or charged head like a phospholipid has.

Select the statement that is incorrect

All carbohydrates have the general formula Cn(H2O)n.

_____ is the most abundant organic compound on Earth.

Cellulose

As a researcher in a protein lab, you analyze two different proteins for their shape and the amino acids they contain. Your results show that the two proteins have exactly the same numbers and types of amino acids, but they have different shapes. What is the best explanation for these results?

Each protein has a unique linear sequence of amino acids.

Proteins perform a variety of functions in living organisms. The protein lysozyme (shown in the figure) is found in tears and saliva where it prevents infection by catalyzing the destruction of specific molecules on the surface of many kinds of bacteria. To which functional class of proteins does lysozyme belong?

Enzymatic protein

Which characteristics best describe the side chains in the part of the protein in contact with the phospholipid tails of the membrane?

Non-polar; hydrophobic

Match the monomers with their polymers.

Nucleic acid polymers are made up of nucleotide monomers. Carbohydrate polymers are made up of simple sugar monomers Protein polymers are made up of amino acid monomers.

This table summarizes the results of your analysis Based on these data alone, identify the best hypothesis for the species identity of your sample.

The sample is most likely S. salar (Atlantic salmon) because the 20-base nucleotide sequence is an exact match to the S. salar standard.

Glycogen is _____.

a polysaccharide found in animals

Classifying amino acids III Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar.

acidic - Glutamic Acid neutral polar - Tyrosine & Threonine neutral nonpolar - Valine & Tryptophan

A function of cholesterol that does not harm health is its role _____.

as a component of animal cell membranes

Classifying amino acids I Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar.

basic - Arginine neutral polar - Asparagine & Glutamine neutral nonpolar - Alanine

Classifying amino acids II Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar.

basic - Lysine neutral polar - Serine neutral nonpolar - Proline, Methionine, & Phenylalanine

Which of these is a polysaccharide?

cellulose

What is another name for a condensation reaction?

dehydration

Identifying a DNA nucleotide Identify three possible components of a DNA nucleotide.

deoxyribose, phosphate group, thymine

What is the name of the process during which a bond between two monomers is broken?

hydrolysis

What holds phospholipids together in a bilayer formation?

hydrophilic and hydrophobic interactions with water

glucose + glucose —> _____ by _____.

maltose + water ... dehydration synthesis

Which of these is a source of lactose?

milk

What functional feature(s) does the phosphate group contribute to the structure of a phospholipid? Select all that apply.

negative charge to interact with water place to attach another small charged molecule

Which of these is rich in unsaturated fats?

olive oil

How many fatty acids are in a phospholipid?

2

Which of these is NOT a lipid?

RNA