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WorksheetsBiology Keystone Mixed Review
Total questions: 50
Worksheet time: 2hrs 39mins
When DNA separates into two strands, the DNA would most likely be directly involved in
replication
fertilization
differentiation
evolution
Which population of organisms would be in greatest danger of becoming extinct?
A population of organisms having few variations living in a stable environment.
A population of organisms having few variations living in an unstable environment.
A population of organisms having many variations living in a stable environment.
A population of organisms having many varia- tions living in an unstable environment.
A student observes that an organism is green. A valid conclusion that can be drawn from this observation is that
the organism must be a plant
the organism cannot be single celled
the organism must be an animal
not enough information is given to determine whether the organism is a plant or an animal
When a person does strenuous exercise, small blood vessels (capillaries) near the surface of the skin increase in diameter. This change allows the body to be cooled. These statements best illustrate
synthesis
homeostasis
excretion
locomotion
Which ecological term includes everything represented in the illustration below?
ecosystem
community
population
species
Which sequence represents the correct order of levels of organization found in a complex organism?
cells → organelles → organs → organ systems → tissues
tissues → organs → organ systems → organelles → cells
organelles → cells → tissues → organs → organ systems
organs → organ systems → cells → tissues → organelles
Scientific studies show that identical twins who were separated at birth and raised in different homes may vary in height, weight, and intelligence. The most probable explanation for these differences is that
original genes of each twin increased in number as they developed
one twin received genes only from the mother while the other twin received genes only from the father
environments in which they were raised were different enough to affect the expression of their genes
environments in which they were raised were different enough to change the genetic makeup of both individuals
The instructions for the traits of an organism are coded in the arrangement of
glucose units in carbohydrate molecules
bases in DNA in the nucleus
fat molecules in the cell membrane
energy-rich bonds in starch molecules
In heterotrophs, energy for the life processes comes from the chemical energy stored in the bonds of
water molecules
oxygen molecules
organic compounds
inorganic compounds
The diagram above shows a process that can occur during meiosis. The most likely result of this process is
a new combination of inheritable traits that can appear in the offspring
an inability to pass either of these chromosomes on to offspring
a loss of genetic information that will produce a genetic disorder in the offspring
an increase in the chromosome number of the organism in which this process occurs
In animals, the normal development of an embryo is dependent on
fertilization of a mature egg by many sperm cells
production of new cells having twice the number of chromosomes as the zygote
production of body cells having half the number of chromosomes as the zygote
mitosis and the differentiation of cells after fertilization has occurred
Which letter indicates a cell structure that directly controls the movement of molecules into and out of the cell?
A
B
C
D
Which process normally occurs at the placenta?
Oxygen diffuses from fetal blood to maternal blood.
Materials are exchanged between fetal and maternal blood.
Maternal blood is converted into fetal blood.
Digestive enzymes pass from maternal blood to fetal blood.
Which activity would stimulate the human immune system to provide protection against an invasion by a microbe?
receiving antibiotic injections after surgery
choosing a well-balanced diet and following it throughout life
being vaccinated against chicken pox
receiving hormones contained in mother’s milk while nursing
In an ecosystem, the presence of many different species is critical for the survival of some forms of life when
ecosystems remain stable over long periods of time
significant changes occur in the ecosystem
natural selection does not occur
the finite resources of Earth increase
herbivores
parasites
carnivores
producers
A new island formed by volcanic action may eventually become populated with biotic communities as a result of
a decrease in the amount of organic material present
decreased levels of carbon dioxide in the area
the lack of abiotic factors in the area
the process of ecological succession
Decomposers are important in the environment because they
convert large molecules into simpler molecules that can then be recycled
release heat from large molecules so that the heat can be recycled through the ecosystem
can take in carbon dioxide and convert it into oxygen
convert molecules of dead organisms into permanent biotic parts of an ecosystem
An environment can support only as many organisms as the available energy, minerals, and oxygen will allow. Which term is best described by this statement?
biological feedback
carrying capacity
homeostatic control
biological diversity
Why do scientists consider any hypothesis valuable?
A hypothesis requires no further investigation.
A hypothesis may lead to further investigation even if it is disproved by the experiment.
A hypothesis requires no further investigation if it is proved by the experiment.
A hypothesis can be used to explain a conclusion even if it is disproved by the experiment.
Which two systems are most directly involved in providing molecules needed for the synthesis of fats in human cells?
digestive and circulatory
excretory and digestive
immune and muscular
reproductive and circulatory
Organisms from a particular ecosystem are shown above. Which statement concerning an organism in this ecosystem is correct?
Organism 2 is heterotrophic.
Organism 3 helps recycle materials.
Organism 4 obtains all of its nutrients from an abiotic source.
Organism 5 must obtain its energy from organism 1.
In a cell, information that controls the production of proteins must pass from the nucleus to the
cell membrane
chloroplasts
mitochondria
ribosomes
The diagram above represents a pyramid of energy in an ecosystem. Which level in the pyramid would most likely contain members of the plant kingdom?
A
B
C
D
Which condition would cause an ecosystem to become unstable?
only heterotrophic organisms remain after a change in the environment
a slight increase in the number of heterotrophic and autotrophic organisms occurs
a variety of nonliving factors are used by the living factors
biotic and abiotic resources interact
Which statement best describes a relationship between enzymes and a simple biological reaction?
Enzymes will increase the amount of substrate formed during a biological reaction.
Enzymes will decrease the amount of substrate formed during a biological reaction.
A reaction rate can be increased when the specific enzyme for a biological reaction is present.
A reaction rate can be decreased when multiple enzymes for a biological reaction are present.
Which of the following is most involved in providing structure for a plasma membrane?
the number of protein channels embedded in the membrane
the types of carbohydrates attached to proteins on the surface
the types of proteins that are attached to the surface of the membrane
the arrangement of the hydrophobic and hydrophilic ends of the phospholipids
Which cell process is best modeled by the diagram?
osmosis
exocytosis
passive transport
facilitated diffusion
The shivering mechanism in bumblebees often serves the same purpose as it does in mammals. During which condition will the action of shivering most help a bumblebee to maintain homeostasis?
decrease in available oxygen
low environmental temperature
uncontrolled rise in core temperature
depletion of oxygen in muscle tissues
The DNA Replication diagram is incomplete. Which nucleotide sequence accurately shows the DNA strand that would be produced during DNA replication?
TCCA
AGGT
UCCU
AGGU
The genetic event shown in the diagram can occur during meiosis. Which statement best describes this type of event?
Gene sequences that are identical are replicated and added to the homologous chromosome.
Sections of DNA between nonhomologous chromosomes are exchanged, decreasing genetic diversity.
Segments of homologous chromosomes are exchanged, resulting in cells that will be genetically different.
The traits from two sections of the same DNA strand are altered, resulting in the production of a new species.
Trees are typically able to transport water from their roots to their stems and leaves. Which statement describes the property of water that most supports the transportation of water to all parts of a tree?
Water forms a crystalline structure when it freezes
Water dissolves fewer substances than any other liquid
Water has strong attractions to itself and many other molecules
Water can absorb large amounts of energy with minimal temperature changes
Which process best describes the assembly of proteins from amino acids?
Atoms are linked to form a compound.
Monomers are linked to form a polymer.
Atoms are added to a monomer until it becomes a polymer.
Molecules are added to a compound until it becomes a monomer.
A scientist observes a single-celled organism with several long, whip-like tails. Which function do the whip-like tails most likely perform for the organism?
defense against predators
movement through an environment
detection of the location of a light source
measurement of atmospheric temperature changes
Yellowstone National Park contains many different plants and animals that interact with one another. What is this level of ecological organization called?
community
ecosystem
organism
population
A scientist studies birds on a set of islands. Based on their varied beak types but similar body structure, the scientist proposes that the birds had a common ancestral population, which then adapted to the local food sources of the different islands. Which best describes the scientist’s proposal?
a hypothesis
a principle
a theory
a fact
Rock pocket mice are found in the deserts of the southwestern United States. They usually live on light-colored rocks and have light coats, with some having dark coats. About 1.7 million years ago, a series of volcanic eruptions left black lava deposits in regions where the rock pocket mice lived. The table shows frequency of allele distribution for dark and light coat color in regions with and without lava deposits. Based on information in the table, which traits in this population were most likely to be selected for, resulting in an increase due to natural selection?
traits that aided survival
traits that produced variations
traits that reduced competition
traits that favored reproduction
Pistol shrimp and goby fish live together in a burrow that is made and maintained by the pistol shrimp. The pistol shrimp is nearly blind and the goby fish touches its tail when a big fish is nearby. This makes the pistol shrimp move quickly into the burrow.
Which relationship do the pistol shrimp and the goby fish have?
commensalism
competition
mutualism
predation
Cytochrome C is a protein made of 112 amino acids that is essential for cellular respiration. The human cytochrome C differs the cytochrome C of the bacteria Caldithrix abyssi in 30 amino acids.
What do the cytochrome C proteins of humans and Caldithrix abyssi have in common?
Both are modified within the Golgi complex
Both function in the mitochondria of the cell
Both are made on the rough endoplasmic reticulum
Both are produced using transcription and translation
The lists shows some information collected by students about an ecosystem.Which numbers describe abiotic components of the temperate grassland ecosystem?
1 and 3
2 and 4
1, 3, and 4
2, 3, and 5
Hemophilia is an X-linked condition in which the process of blood clotting is impaired. The allele XH for normal blood clotting is dominant over the allele Xh, which results in hemophilia. What is the probability that a male offspring of a cross between a carrier female and a normal male is a hemophiliac?
25%
50%
75%
100%
Which best describes an example of mutualism?
Mistletoe lives in the branches of tall trees, absorbing nutrients from the tree branch.
A leech attaches to the side of a fish, where it sucks blood and cell fluids from the fish.
A clown fish hides in the tentacles of a sea anemone, drawing larger fish to the anemone.
A barnacle attaches to the sides of a whale, filtering nourishment as the whale swims along.
Which best describes the concentration of dissolved minerals in ocean water?
Mineral concentration increases as dissolved solids enter the ocean.
Mineral concentration decreases as runoff from the land enters the ocean.
Mineral concentration decreases as ocean water evaporates into the atmosphere.
Mineral concentration increases as water plants on the surface carry out photosynthesis.
In 1859, European rabbits were brought to Australia. They ate the same plants as sheep already living in Australia. This made raising sheep nearly impossible for farmers. Which relationship occurred between European rabbits and Australian sheep?
coexistence
commensalism
competition
parasitism
Which part of a plant would be used in the study of meiosis?
anther from a flower
guard cells from a leaf
epidermal cells from a root
vascular tissue from a stem
Which cellular structure produces energy from glucose?
chloroplast
mitochondrion
nucleus
ribosome
Which process ends with the release of a newly synthesized protein into cellular cytoplasm?
translation
transcription
DNA synthesis
DNA replication
Which subunits form a nucleotide of RNA?
ribose, phosphate, and uracil
phosphate, ribose, and thymine
deoxyribose, adenine, and phosphate
cytosine, phosphate, and deoxyribose
Which stores the most energy?
carbohydrates
glucose
lipids
starches
How are diffusion and osmosis similar?
They both involve enzymes.
They are both processes that require ATP.
They are both involved in passive transport.
They both involve the simultaneous movement of a variety of molecules.
