Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
112 Cards in this Set
- Front
- Back
|
A student suggests that a certain species of bacteria grows better in the light than the dark. The student has 10 culture plates on which to grow the bacteria. What would be the best experiment to test this idea?
|
Grow 5 plates in the dark and 5 plates in teh light
|
|
|
The process by which organisms keep theri internal conditions fairly constant is called...
|
homeostasis
|
|
|
What is the term for a group of organisms of one type living in the same place?
|
Population
|
|
|
In the metric system, the basic unit of length is the...
|
meter
|
|
|
Which of the following variables present in Redi's experiment on Sponaneous Generation is NOT a controlled variable?
1) gauze covering that keeps flies away from meat 2) types of jars used 3) types of meat used 4) temperature at which the jars were stored |
1) gauze covering that keeps the flies away from the meat
|
|
|
The basic unit of mass in SI is the...
|
gram
|
|
|
What is the highest possible magnification that a scientist can use in order to study living things?
|
1,000x with a compound light microscope
|
|
|
When enough experimental data support a hypothesis, the hypothesis becomes...
|
theory
|
|
|
is a theory always true?
|
no it may be revised or replaced
|
|
|
To observe a small, living organism, a scientist might use a...
|
compound light microscope
|
|
|
Why would you want to use a scanning electron microscope?
|
ability to see images of the surfaces or objects
|
|
|
what is the term given to a group of cells that develops from a single original cell?
|
cell culture
|
|
|
Scientific hypotheses must be proposed in a way that...
|
enables them to be tested
|
|
|
a controlled experiment allows a scientist to isolate adn test
|
a single variable
|
|
|
what technique is used to separate the different cell parts?
|
cell fractionation
|
|
|
the work of scientists usually begins with...
|
carefull observations
|
|
|
hypotheses may arise from...
|
prior knowledge, logical inferences, informed, creative imagination
|
|
|
During an experiment, measuring the height of a plant in centimeters would be an example of collecting _____ data
|
quantitive
|
|
|
the name given to the idea that life could arise form nonliving matter is ___________
|
spontaneous generation
|
|
|
based on his observations, Redi made a prediction that keeping flies away from meat would prevent __________
|
presence of maggots
|
|
|
The scientist named ______ finally settled the argument over whether or not life could arise from the nonliving matter
|
pasteur
|
|
|
a revised version of the original _____ system is called SI, an abbreviation for the System International d' Unites
|
metric
|
|
|
in science, a theory is a well tested explanation that unifies a broad range of _______
|
Observations
|
|
|
the combination of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes is called ________
|
metabolism
|
|
|
Needham's fallacy in his experiment was assuming that _____ would kill all the "animalcules"
|
heating
|
|
|
Spallanzi's improved on Needham's experiment by ______ the flasks of broth
|
boiling
|
|
|
the three particles that make up atoms are...
|
protons, neutrons and electrons
|
|
|
the space surrounding the nucleus of an atom contains...
|
electrons
|
|
|
if an atom contains 3 protons, 4 neutrons and 3 electrons, its mass number would be...
|
7
|
|
|
isotopes are atoms of the same element with the same number of protons and...
|
a different number of neutrons
|
|
|
what is a use of radioactive isotopes?
|
1) can determine the ages of rocks and fossils
2) can be used to treat cancer and kill bacteria that cause food to spoil 3) can be used as tracers to follow the movement of substances within organisms |
|
|
if an atom contains 11 protons and 12 neutrons what is its atomic number?
|
11
|
|
|
which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?
|
compound
|
|
|
what is the molecule of water
|
H2O
|
|
|
which of the following is true about a compound?
1) the physical and chemical properties of a compound are usually very different from those of the elements from which it is formed 2) only the physical properties of a compound are usually the same as those of the elements from which it is formed 3) only the chemical properties of a compound are usually the same of the elements from which it is formed |
1) the physical and chemical properties of a compound are usually very different from those of the elements from which it was formed.
|
|
|
a covalent bond is formed as a result of...
|
sharing an electron pair
|
|
|
what type of electron is available to form bonds?
|
valence
|
|
|
what type of ion forms when an atom loses electrons?
|
positive
|
|
|
ice floats on water because...
|
water expands when it freezes
|
|
|
the most abundant compound is in most living things is
|
water
|
|
|
water molecules are polar with the....
|
oxygen side being slightly negative and the hydrogen side being slightly positive
|
|
|
a solution is a...
|
evenly distributed mixture of two or more substances
|
|
|
if you stir salt into boiling water, you produce a...
|
mixture called a solution
|
|
|
when salt is dissolved in water, water is the...
|
solvent
|
|
|
solutions that contains concentrations of H+ ions lower than pure water...
|
are bases
|
|
|
a monosaccaride is a...
|
carbohydrate
|
|
|
DNA molecules are made of...
|
nucleotides
|
|
|
when hydrogen and oxygen combine to form water, water is the...
|
product
|
|
|
what is the process that changes one set of chemicals into another set of chemicals?
|
chemical reaction
|
|
|
what is the term used to describe the energy needed to get a reaction started?
|
activation energy
|
|
|
chemical reactions that release energy...
|
often occur spontaneously
|
|
|
a substance that accelerates the rate of a chemical reaction is called a...
|
catalyst
|
|
|
suspensions are mixtures...
|
of water and non dissolved material
|
|
|
which of the following organic compounds is the main source of energy for living things?
|
carbohydrates
|
|
|
the basic unit of matter is the...
|
atom
|
|
|
water is the greatest ____ in the world
|
solvent
|
|
|
_____ are important parts of biological membranes and waterproof coverings
|
lipids
|
|
|
proteins that speed up the rate of chemical reactions in the cell are...
|
catalysts
|
|
|
a chemical bond formed by the transfer of electrons is a(n) _____ bond
|
ionic
|
|
|
the subatomic particles that make up atoms are protons, neutrons and....
|
electrons
|
|
|
because they have the same number of protons and electrons, all isotopes of an element have the same _______ properties
|
chemical
|
|
|
a chemical bond formed by the transfer for electrons is a ______ bond
|
ionic
|
|
|
the space surrounding the nucleus of an atom contains...
|
electrons
|
|
|
what type of ion forms when an atom loses electrons?
|
positive
|
|
|
ice floats on water because...
|
water expands when it freezes
|
|
|
the most abundant compound in living things is...
|
water
|
|
|
a substance with a pH of 6 is called...
|
an acid
|
|
|
the nucleus is made up of...
|
protons and neutrons
|
|
|
isotopes are atoms of the same element with the same number of protons and...
|
a different number of neutrons
|
|
|
what describes a substance formed by the combination of two or more elements in definite proportions?
|
compound
|
|
|
a covalent bond is formed as a result of...
|
sharing electrons
|
|
|
the work of Schleiden and Schwann can be summarized by saying that...
|
all plants and animals are made of cells
|
|
|
which cell structure contains the cell's genetic material and controls many of the cell's activities?
|
nucleus
|
|
|
cells fall into two broad categories, depending on whether they...
|
have a nucleus
|
|
|
eukaryotes usually contain...
|
a nucleus, specialized organelles and genetic material
|
|
|
which of the following is NOT found in the nucleus?
1) cytoplasm 2) nucleolus 3) chromatin 4) DNA |
1) cytoplasm
|
|
|
which structures carry out cell movement?
|
micro tubules and micro filaments
|
|
|
which organelle breaks down compounds into small particles that the cell can use?
|
lysosome
|
|
|
which organelle makes proteins using coded instructions that come from the nucleus?
|
ribosomes
|
|
|
which organelle converts the chemical energy stored in food into compounds that are more convenient for the cell to use?
|
mitochondria
|
|
|
what is the function of the cell membrane?
|
regulates which materials enter and leave the cell
|
|
|
diffusion occurs because...
|
molecules constantly move and collide with one another
|
|
|
an animal cell that is surrounded by fresh water will burst because the osmotic pressure causes...
|
water to move into the cell
|
|
|
who was one of the first people to identify and see cork cells?
|
Robert Hooke
|
|
|
electron microscopes can reveal details...
|
1000 times smaller than those visible in light microscopes
|
|
|
which of the following structures is found in the cytoplasm?
|
ribosome
|
|
|
which organelles help provide cells with energy
|
mitochondria and chloroplasts
|
|
|
what is the sequence that correctly traces the path of a protein in the cell?
|
rough endoplasmic reticulum, golgi apparatus, released from the cell
|
|
|
what is the function of the cytoskeleton?
|
helps the cell keep it's shape
|
|
|
the cell membrane contains channels and pumps that help move materials from one side to the other. What are these channels and pumps made of?
|
proteins
|
|
|
diffusion is the movement of molecules from...
|
an area of high concentration to an area of low concentration
|
|
|
which means of particle transport requires input of energy from the cell?
|
active transport
|
|
|
the diffusion of water across a selectively permeable membrane is called...
|
osmosis
|
|
|
what did Griffith observe when he injected into mice a mixture of heat-killed disease-causing bacteria and live harmless bacteria?
|
the mice developed pneumonia
|
|
|
which of the following is a nucleotide found in DNA?
|
deoxyribose + phosphate group + cytosine
|
|
|
DNA replication results in two DNA molecules...
|
each with one new strand and one original strand
|
|
|
during mitosis what happens?
|
DNA molecules become more tightly coiled
|
|
|
what would Hershey and Chase have concluded if both radioactive 32P and 35S were found in the bacteria in their experiment?
|
pyrimidines in DNA is about equal to the percentage of purines
|
|
|
in eukaryotes, DNA
|
is located in the nucleus
|
|
|
DNA is copied during a process called...
|
replication
|
|
|
during DNA replication, a DNA strand that has the bases CTAGGT
|
GATCCA
|
|
|
Avery's experiment showed that bacteria are transformed by
|
DNA
|
|
|
DNA contains the sugar...
|
deoxyribose
|
|
|
Genes contain instructions for assembling...
|
nucleosomes
|
|
|
chromatin contains proteins called...
|
histones
|
|
|
in DNA, _____ and ______ are pyrimidines
|
cytosine, thymine
|
|
|
DNA replication takes place in the _____ of the cell
|
nucleus
|
|
|
the principal enzyme that carries out DNA replication is called_____
|
polymerase
|
|
|
the purines present in the DNA are called ______ and _______
|
adenine, guanine
|
|
|
the process in which a segment of DNA is copied into a complementary sequence of RNA is called ______
|
replication
|
|
|
the backbone of the DNA molecule is made up of _______ and _____
|
deoxyribose, phosphate
|
|
|
the Watson and Crick model of DNA is a ______________ in which two strands are wound around each other
|
double helix
|
