Ch 3 Homework Assignment

What is a polymer? a large molecule composed of many repeated subunits a complex composed of many different carbohydrate molecules a small subunit that can react with other similar molecules a molecule formed by the bonding of two identical molecules

a large molecule composed of many repeated subunits

What is a monomer? -a molecule that can form an ionic bond with another molecule -a small molecule that can react with similar molecules to form a polymer -a large molecule composed of many repeated subunits -a molecule formed by the bonding of three identical molecules

a small molecule that can react with similar molecules to form a polymer

What are the monomers, or building blocks, of a protein? phospholipids nucleotides monosaccharides fatty acids amino acids

amino acids

Which substances contain, or are examples of, lipids? cell membrane cell wall DNA beeswax testosterone enzyme

cell membrane beeswax testosterone

DNA and RNA are nucleic acids. Like other polymers, nucleic acids are made up of repeating units called monomers. What are the monomers, or building blocks, of nucleic acids? monosaccharides fatty acids amino acids nucleotides

nucleotides

Which statement about organic compounds is true? -A compound that a living organism requires for survival is considered to be organic. -An organic compound typically has at least one carbon-hydrogen or carbon-carbon bond. -A compound that contains oxygen and hydrogen is organic if the compound lacks carbon. -A naturally‑occurring compound is organic, whereas a synthetic compound is inorganic.

An organic compound typically has at least one carbon-hydrogen or carbon-carbon bond.

Classify the traits of eukaryotic nucleic acids as typical of DNA only, RNA only, or both. DNA only RNA only Both

DNA only: uses thymine double stranded RNA only: uses uracil single stranded Both: made of nucleotides contains codes for proteins

Classify these items according to whether they are descriptions or examples of monomers or polymers. Monomers: Polymers:

Monomers: individual subunits of larger molecules simple sugars nucleotides Polymers: molecules composed of smaller subunits linked together cellulose muscle protein DNA

Determine which molecules are organic and which molecules are inorganic.

Organic: Ethane Acetic Acid Inorganic: Water Ammonia

Cell membranes are composed of phospholipids that have head and tail regions. The phospholipid tail is hydrophobic and spontaneously orients to the inside of the membrane. Which of the phrases best describes the hydrophobic portion of a phospholipid? is repelled by lipids has few interactions with water has an affinity for low salt concentrations forms hydrogen bonds with water

has few interactions with water

Cell membranes are composed of phospholipids that have head and tail regions. The phospholipid head is hydrophilic and spontaneously orients toward the environment. Which of the phrases best describes the hydrophilic region of a phospholipid? has an affinity for high salt concentrations repelled by water floats in nonpolar compounds interacts with water

interacts with water

You have been hired to develop a drug to inhibit the action of a certain enzyme. Where should the drug bind to competitively inhibit the enzyme? to the substrate of the enzyme to the active site of the enzyme to the mRNA that encodes the enzyme to a site on the enzyme other than the active site

to the active site of the enzyme

For each example, identify if the food contains mostly saturated or unsaturated fatty acids: -Vegetable oil, which is a liquid at room temperature, is used in making cake batter. -Chocolate, which is solid at room temperature , is derived from a seed -Cheese, which is a solid at room temperature, is often used in cooking -The oil inside flaxseed oil pills is liquid at room temperature

unsaturated saturated saturated unsaturated