Scientific Method
Characteristics of Life
Biochemistry
Enzymes
100
Scientific claims should be questioned if
1) peer review was used to examine the claims made by scientists
2) the experimental results cannot be repeated by other scientists
3) conclusions follow logically from the evidence
4) the data are based on samples that are very large
2) the experimental results cannot be repeated by other scientists
100
What are the scientific words we use for living and nonliving?
biotic and abiotic
100
Which group contains only molecules that are each assembled from smaller organic compounds?
1) proteins, water, DNA, fats
2) proteins, starch, carbon dioxide, water
3) proteins, DNA, fats, starch
4) proteins, carbon dioxide, DNA, starch
3) proteins, DNA, fats, starch
100
In living cells, chemical processes, such as synthesis, all require the action of
1) specialized antibiotics
2) hormones
3) salts
4) biological catalysts
4) biological catalysts
200
An experiment is carried out to determine how different pH values of soil will affect the growth of tomato plants. In this experiment, the dependent variable could be the
1) height of the tomato plants
2) pH of the soil
3) specific variety of tomato plants used
4) pH of enzymes in tomato leaf cells
1) height of the tomato plants
200
The breathing rate, heart rate, and blood hormone levels of an individual would directly provide information about that individual's
1) cellular organization
2) nutrition
3) inheritance
4) metabolic activity
4) metabolic activity
200
Base your answer on the diagram below, which represents stages in the digestion of a starch, and on your knowledge of biology.
The products would most likely contain
1) simple sugars
2) fats
3) amino acids
4) minerals
1) simple sugars
200
A characteristic of enzymes that allows them to work effectively with other organic molecules is their
1) specific shape
2) small size
3) concentration of carbon and hydrogen atoms
4) high-energy bonds
1) specific shape
300
Jean-Baptiste Lamarck was a French naturalist who proposed the idea that modern-day organisms developed new characteristics through a process known as the inheritance of acquired traits. As more evidence became available, this theory was eventually replaced by Charles Darwin's theory of evolution. This modification of scientific knowledge illustrates that
1) scientists do not communicate with each other and often make mistakes
2) all scientific explanations are tentative and subject to change or improvement
3) scientists often ignore evidence that does not help prove their theory
4) hypotheses seldom chan
2) all scientific explanations are tentative and subject to change or improvement
300
Which observation could lead to the conclusion that an object is nonliving?
1) It passes on hereditary information only through asexual reproduction.
2) It carries out synthesis.
3) It cannot perform metabolic processes.
4) It is composed of a cell, but does not have tissues.
3) It cannot perform metabolic processes.
300
Organisms contain compounds such as proteins, starches, and fats. The chemical bonds in these compounds can be a source of
1) amino acids
2) simple sugars
3) energy
4) enzymes
3) energy
300
Base your answer on the diagram below, which represents stages in the digestion of a starch, and on your knowledge of biology.
The structure labeled X most likely represents
1) an antibody
2) a receptor molecule
3) an enzyme
4) a hormone
3) an enzyme
400
Which statement is an example of a hypothesis that can be tested through experimentation?
1) The number of times a dog wags its tail is a direct measure of how happy the dog is.
2) Is the ability of a fish to taste food affected by how clear the water is where it lives?
3) A plant's fear of herbivores increases as the plant grows older.
4) If the temperature increases, then bacterial growth will increase.
4) If the temperature increases, then bacterial growth will increase.
400
A small lizard spends the morning hours lying in the sunlight until its body temperature rises. Later on in the day, the lizard rests in a shady area until its body temperature cools. This type of behavior is important to
1) maintain homeostasis
2) detect variations
3) attract mates
4) obtain nutrients
1) maintain homeostasis
400
Base your answer 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
1) amino acids
2) simple sugars
3) fats
4) molecular bases
2) simple sugars
400
Which row in the chart below contains correct information concerning synthesis?
3) 3
500
A student wanted to investigate the effect of light on the rate of ripening of tomatoes. She set up four pots of the same size with identical amounts of soil, water, and type of tomato plants. Each plant was exposed to a different intensity of light as shown in the table below.
The independent variable in this experiment is the
Light Intensity
500
Explain why a whale is a living thing. Be sure to use at least 3 characteristics of life in your answer.
1. Growth - the whale became larger as it aged
2. Metabolism - the whale has to breathe and digest food
3. Reproduction - the whale is able to produce offspring
500
The diagram below represents a protein molecule present in some living things.
This type of molecule is composed of a sequence of
1) amino acids arranged in a specific order
2) simple sugars alternating with starches arranged in a folded pattern
3) large inorganic subunits that form chains that interlock with each other
4) four bases that make up the folded structure
1) amino acids arranged in a specific order
500
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
1) are not affected by pH
2) work best at different pH levels
3) work best in an acidic environment
4) work best in a basic environment
2) work best at different pH levels