Macromolecules
One difference between carbohydrates and lipids is that
A.Lipids will dissolve in water but not carbohydrates.
B.Carbohydrates will dissolve in water but not lipids.
C. Carbohydrates contain hydrogen, carbon, and oxygen and lipids do not.
D. Lipids contain hydrogen, carbon, and oxygen and carbohydrates do not.
B.Carbohydrates will dissolve in water but not lipids.
Which is the best description of an atom?
A. a positively charged particle
B. the basic unit of energy
C. a particle that carries a charge
D. the building block of all matter
D. the building block of all matter
Water has many unique properties attributed to its polarity. Which correctly pairs the water property with a correct example of the property.
A. A solid (ice) is more dense than a liquid (water) so it sinks.
B. Surface tension is caused by the cohesion or "stickiness" of water molecules.
C. Due to cohesion, water is the universal solvent, dissolving most nonpolar substances.
D. Due to water's high specific heat, the temperature of water rises and falls very quickly allowing bodies of water to moderate air temperature.
B. Surface tension is caused by the cohesion or "stickiness" of water molecules.
In the periodic table of the elements, elements in Group 1 have how many outer electrons?
A. 1
B. 8
C. 0
D. 4
A. 1
Most biological macromolecules contains carbon, hydrogen and oxygen atoms. Which of these has the carbon, hydrogen and oxygen in a 1:2:1 ratio?
A.carbohydrates
B.lipids
C. oils
D. proteins
A. carbohydrates
Which of the following particles are found in the nucleus of an atom?
A. neutrons and electrons
B. protons
C. protons, neutrons and electrons
D. protons and neutrons
D. protons and neutrons
The attraction between hydrogen and oxygen atoms in different water molecules is known as a(n)
A.ionic bond.
B.hydrogen bond.
C.covalent bond.
D.dispersion force.
B.hydrogen bond.
How many protons are in the element Copper
A.9
B.17
C.29
D. 71
C.29
Fats are broken into saturated fats and unsaturated fats. Which of these explains the difference between saturated and unsaturated fats?
A. Saturated fats have no hydrogen in the molecule.
B.Saturated fats have more carbon atoms than unsaturated fats.
C.Saturated fats have only single bonds on all the carbon atoms.
D. Saturated fats have only double and triple bonds on the carbon atoms.
C.Saturated fats have only single bonds on all the carbon atoms.
What do elements that share the same number of valence electrons have in common?
A.The elements share similar symbols.
B.The elements share similar number of neutrons
C.The elements share similar properties.
D.The elements share similar masses
C.The elements share similar properties.
X2
Which is an example of the adhesive properties of water?
A.Water beads on a smooth surface.
B.A dish towel can absorb water.
C.A cup of water can be filled to the brim without spilling over.
D. Small insects can stand on water.
B.A dish towel can absorb water.
Starting at the left side of a period and moving right, what happens to the number of protons in the elements?
A. the number protons increases by 1 for each column
B. the number of protons decreases by 1 for each column
C. the number of protons stays the same
D. the number of protons increases by 2 for each column.
A. the number protons increases by 1 for each column
A wide range of molecular compounds dissolve in water. This allows water to act as a medium for moving molecules into and out of cells and tissues.
Which compound does NOT dissolve in water?
A.lipids
B.sugars
C.amino acids
D.carbohydrates
A. lipids
What causes an ion to form?
A.an atom loses neutrons
B. an atom gives up an electron to another atom
C. an atom gives up a proton to another atom
D. an atom gains neutrons
B. an atom gives up an electron to another atom
Which term describes substances that dissolve easily in water?
A. hydrophobic
B. solvent
C. hydrophilic
D. covalent
C. hydrophilic
Which element is present in the amino acids that form proteins but is not carbohydrates or lipids?
A.C
B. N
C. O
D.H
B. N
Lipids, mainly phospholipids, make up the bulk of the cell membrane. Which of these best compares how the structure of the phospholipid is so perfectly paired to the function of the cell membrane?
A. Phospholipids are bulky/large molecules that prevent all molecules from entering/exiting the cell.
B.The polar tails of the phospholipids provide the barrier between the exterior/interior hydrophilic environments.
C. Lipids contain high energy bonds, and these bonds help to provide the energy to move molecules across the membrane.
D. The head of the phospholipid, which is hydrophilic, helps to control the movement of large hydrophobic molecules, and the tails of the phospholipid, which are hydrophobic, help to control the movement of large hydrophilic molecules.
D. The head of the phospholipid, which is hydrophilic, helps to control the movement of large hydrophobic molecules, and the tails of the phospholipid, which are hydrophobic, help to control the movement of large hydrophilic molecules.
Some carbohydrates consist of glucose molecules that share electrons equally. Which type of bond would be found in these carbohydrates?
A. polar covalent
B. nonpolar covalent
C.hydrogen
D. ionic
B. nonpolar covalent
x3
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?
A.High surface tension of water is best explained by its property of adhesion. Adhesion is the attraction of water molecules to water molecules.
B.Cohesion is a property of water that enables the high surface tension. Cohesion is the attraction of water molecules with other water molecules.
C.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.
D. 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.
B.Cohesion is a property of water that enables the high surface tension. Cohesion is the attraction of water molecules with other water molecules.
What is the ratio of elements found in the compound MgCl2?
A.2 atoms of chlorine for every atom of magnesium
B.2 atoms of chlorine for every two atoms of magnesium
C.2 atom of magnesium for every 1 atoms of chlorine
D. 1 atom of magnesium for every atom of chlorine
A.2 atoms of chlorine for every atom of magnesium