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WorksheetsChapter 2 Chemistry of Life Exam
Total questions: 43
Worksheet time: 37mins
The study of chemistry begins with the basic unit of matter, the ____________.
cell
atom
nucleus
enzyme
What subatomic particles make up the mass of the nucleus?
Electrons and neutrons
Electrons and protons
Protons and neutrons
Protons and nucleic acids
The ____________ is positively charged, whereas the ____________ is negatively charged.
Neutron, electron
Proton, electron
Electron, neutron
Proton, neutron
Water molecules have partial charges which makes them __________, and they are able to bond to other water molecules through __________________.
Nonpolar, covalent bonding
Polar, covalent bonding
Nonpolar, hydrogen bonding
Polar, hydrogen bonding
If your friend took a pH test of a mystery solution and the number came out to 4.5 on the pH scale, what would you tell him?
There are absolutely no hydrogen ions in that solution, which makes it more basic!
There are more hydrogen ions in that solution, which makes it more acidic!
There are more hydroxide ions in that solution, which makes it more acidic!
There are less hydrogen ions in that solution, which makes it neutral!
Household bleach has a pH between 12 and 13. From this information, which of the following BEST describes the bleach solution?
The solution is acidic, meaning it has more hydrogen (H+) ions than hydroxide (OH-) ions.
The solution is basic, meaning it has fewer hydrogen (H+) ions than hydroxide (OH-) ions.
The solution is neutral, meaning it has an equal number of hydrogen (H+) ions and hydroxide (OH-) ions.
The solution is a buffer that reacts with solutions containing high concentrations of hydrogen (H+) ions.
Organic compounds contain mostly ____________, ____________ and ____________ atoms.
Oxygen, carbon and hydrogen
Sulfur, phosphorus and nitrogen
Hydrogen, sulfur and carbon
Nitrogen, oxygen, and hydrogen
Macromolecules are built from __________________ which link together to form __________________.
Polymers, monomers
Monomers, polymers
Monomers, macromolecules
Polymers, compounds
The four main types of macromolecules are:
Acids, bases, enzymes, and nucleic acids
Carbohydrates, lipids, acids, and bases
Nucleic acids, proteins, chemical reactions, and bases
Carbohydrates, lipids, proteins, and nucleic acids
The monomers of carbohydrates are ________________.
disaccharides
monosaccharides
polysaccharides
nucleic acids
This class of macromolecules does not dissolve in water.
Proteins
Amino Acids
Fatty Acids
Lipids
________________ are the building blocks, or monomers, that make up proteins.
Nucleic acids
Amino acids
Fatty acids
Lipids
How many amino acids are in the composition of human beings?
20
32
35
23
________________ are catalysts that help speed up biological reactions.
enzymes
catabolism
nucleic acids
lipids
A DNA nucleotide consists of a ____________, ____________, and __________________.
Deoxyribose, nucleic, acid
Sugar, salt, water
Sugar, base, phosphate
Water, base, sulfur
Which type of macromolecule stores genetic information?
Amino acids
Fatty acids
Nucleic acids
None of the above
Which type of bonds hold two or more water molecules together?
Hydrogen bonds
Covalent bonds
Ionic bonds
None of the above
What changes during a chemical reaction between two compounds?
Number of protons
Total mass
Chemical bonds
Total energy
Pure substance that consists entirely of one type of atom.
(a)
The attraction of molecules of the same substance (ex: water).
(a)
The attraction of molecules of different substances.
(a)
Atoms of the same element that differ in the number of neutrons they contain.
(a)
Elements or compounds produced by chemical reactions.
(a)
Elements or compounds that enter into a chemical reaction.
(a)
Subunit of which nucleic acids are composed; 5 carbon sugar, a phosphate group, and a nitrogenous base.
(a)
Macromolecule made mostly from carbon and hydrogen atoms; fats, oils, and waxes.
(a)
Compound made of carbon, hydrogen, and oxygen atoms.
(a)
Type of mixture in which all the components are evenly distributed.
(a)
How do the types of chemical bonds differ from each other? How are they similar? (Hint there are 4 types)
What is a buffer? Why is it useful to cells?
What are the four major categories of macromolecules? Describe the basic structures and the primary functions of each.
What are the three major roles of proteins?
Compounds with an amino group on one end, and a carbonyl group on the other end, and an R group on another end
(a)
Substance that speeds up the rate of a chemical reaction
(a)
The substance that is dissolved in water
(a)
When atoms share an electron, they form this type of bond
(a)
When atoms transfer electrons, they form this type of bond
(a)
Dissolving substance in a solution
(a)
Substance formed by the chemical combination of two or more elements in definite proportions
(a)
Atom that has a positive or negative charge
(a)
Macromolecule containing hydrogen, oxygen, nitrogen, carbon, and phosphorous
(a)
Macromolecule that contains carbon, hydrogen, oxygen, and nitrogen
(a)
BONUS ON BOARD
(a)
