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WorksheetsUnit 1 Extra Credit
Total questions: 11
Worksheet time: 6mins
The attraction between hydrogen and oxygen atoms in different water molecules is known as a(n)
ionic bond
hydrogen bond
covalent bond
peptide bond
All of the following are true facts about enzymes EXCEPT
Responses
there are a small amount of enzymes, and they each perform many types of reactions
enzymes can speed chemical reactions by hundreds to billions of times.
all living cells have enzymes.
life would not be possible without enzymes.
With regard to enzymes, what can be said to be the relationship between the substrate and the active site?
One substrate can bind to the active site and is changed into products.
The active site of an enzyme combines with the substrate, when a product is given to the enzyme, producing a new molecule.
Every active site will always accept multiple substrates in order to produce a new product.
A specific product fits into the active site of an enzyme. The enzyme then breaks down the product to make a new substrate.
· cell membranes· large biomolecule· many high energy bonds· nonpolar covalent bonds· includes waxes and steroids· consists mainly of carbon and hydrogen· more energy per gram than other biomolecules
The biomolecule described is a?
nucleic acid
lipid
carbohydrate
protein
All the biological macromolecules contain carbon, hydrogen and oxygen. However, most do not contain nitrogen. The category that contains nitrogen are
unsaturated fats.
carbohydrates.
proteins.
lipids.
One difference between carbohydrates and lipids is that
Carbohydrates contain hydrogen, carbon, and oxygen and lipids do not.
Lipids contain hydrogen, carbon, and oxygen and carbohydrates do not.
Lipids will dissolve in water but not carbohydrates.
Carbohydrates will dissolve in water but not lipids.
The human core body temperature is normally 37°C no matter what the temperature of the surroundings or the activity level of an individual. To help reduce the body temperature, sweating occurs. Sweat is mostly water with some salt. It is produced by the sweat glands and pours out onto the surface of the skin. How does sweating help to cool and regulate body temperature?
The increased salt concentration of the body's cells helps maintain a lower body temperature.
The low specific heat of water allows it to readily evaporate into the atmosphere, quickly cooling your body.
Water has a high heat of vaporization; the human body can dissipate excess heat by the evaporation of sweat.
Water's cohesive properties cause water molecules to stick together requiring the body's thermal energy to evaporate sweat into the air.
One of the many unique properties of water is that its solid form (ice) is less dense than its liquid form. Most substances become more dense when in solid form, because their molecules are more tightly compact. Why is this property of water so important to life on Earth?
nutrients are easily dissolved in water to allow distribution
it allows water to travel up plants to distribute water to stems and leaves
ocean water temperature doesn't fluctuate as much due to its high specific heat
surface water freezes and insulates the water below for marine life
Water has a high surface tension. Some insects can stride across the water due to the combination of their legs and the high surface tension of the water. Which property of water best explains the high surface tension?
Cohesion is a property of water that best explain the high surface tension. Cohesion is the attraction of water molecules to other types of molecules.
High surface tension of water is best explained by its property of adhesion. Adhesion is the attraction of water molecules to water molecules.
Cohesion is a property of water that enables the high surface tension. Cohesion is the attraction of water molecules with other water molecules,
High surface tension of water is best explained by its property of adhesion. Adhesion is the attraction of water molecules to other types of molecules.
Amino acids are the monomers of proteins. Which functional group in the amino acid determines its specific shape and function?
amino group
carboxyl group
hydroxyl group
R group
Living matter is at least sixty percent water. It makes sense, then, that cell membranes are made of phospholipids because
Responses
the lipids mix easily in a water environment.
the bilayer acts to repel water.
the lipids form an insoluble barrier.
phosphates dissolve in water.
