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WorksheetsUnit 2 Characteristics of Living Things Regents Review LE
Total questions: 19
Worksheet time: 38mins
A fully functioning enzyme molecule is arranged in a complex three-dimensional shape. This shape determines the...
specific type of molecule it interacts with during a reaction
rate at which the enzyme breaks down during a reaction it regulates
pH of all body systems
temperature of the products of the reaction it regulates
A scientist plans to cut a segment of DNA so that it can be inserted into the DNA of a bacterium, a single-celled organism. The scientist needs to use a special type of organic molecule to perform this cutting process. This molecule is...
a lipid
a carbohydrate
an enzyme
a hormone
Which statement best describes enzymes?
Every enzyme controls many different reactions.
The rate of activity of an enzyme might change as pH changes.
Temperature changes do not affect enzymes.
Enzymes are produced from the building blocks of carbohydrates.
Hydrogen peroxide (H2O2) is a toxic by-product of cellular metabolism in aerobic organisms. The reaction below occurs within the cells to prevent the accumulation of hydrogen peroxide. In the reaction to the right, catalase functions as an...
enzyme in the breakdown of hydrogen peroxide
enzyme in the synthesis of hydrogen peroxide
emulsifier in the digestion of hydrogen peroxide
indicator in the detection of hydrogen peroxide
The graph below represents the effect of pH on three different enzymes at normal body temperature.
The graph illustrates that enzymes 1, 2, and 3
A) B C) D
are not affected by pH
work best at different pH levels
work best in an acidic environment
work best in a basic environment
Base your answer to the following question on the graph below and on your knowledge of biology.
Which section of the graph includes the point at which the enzyme started to denature?
A) I B) II C) III D) IV
I
II
III
IV
Which substance plays a major role in most of the chemical reactions that occur in a living cell?
water
glycogen
glycerol
maltose
Which compound is inorganic?
glucose
carbon dioxide
ethane
stearic acid (Cl8H36O2)
Which elements are present in all organic compounds?
hydrogen and oxygen
nitrogen and oxygen
nitrogen and carbon
hydrogen and carbon
. Base your answer to the following question on the diagram below and on your knowledge of biology. The diagram represents a portion of a starch molecule.
The building blocks for this molecule are...
amino acids
simple sugars
fats
molecular bases
Base your answer to the following question on the diagram below, which represents a chemical reaction that occurs in the human body, and on your knowledge of biology.
Substances X and Y are examples of which kind of molecule?
simple sugar
amino acid
fat
hormone
The basic building blocks of a protein are?
glucose molecules
amino acids
hormones
fats
Enzymes are a type of...
Carbohydrate
Protein
Nucleotide
Fatty Acid
Which pH value indicates the most acidic condition?
1.6
2.1
7.3
11.1
Which life process is indicated by the arrows in the diagram of an amoeba shown to the right?
digestion
excretion
fermentation
transport
The diagram to the right represents a sequence of events that occurs in the human body throughout the day,
These events can best be described as an example of...
an energy cycle
recycling of inorganic materials
a feedback mechanism
a learned behavior
The diagram below represents a cell structure involved in converting energy stored in organic molecules into a form used by animal cells.
The arrows represent the movement of which substances?
carbon dioxide and sugar
oxygen and ATP
ATP and carbon dioxide
oxygen and sugar
. A photograph of human cells as seen with a compound light microscope is shown below. A cell structure is labeled A.
Structure A is most likely a...
mitochondrion that synthesizes food for the cel
nucleus that is the site of food storage
mitochondrion that absorbs energy from the Sun
nucleus that is responsible for the storage of information
The diagram below represents changes in the sizes of openings present in leaves as a result of the actions of cells X and Y.
The actions of cells X and Y help the plant to..
maintain homeostasis by controlling water loss
store excess heat during the day and remove the heat at night
absorb light energy necessary for cellular respiration
detect changes in the biotic factors present in the environment
