science testttt

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The total number of protons in the nucleus is called the
A.
half-life
B.
atomic mass
C.
atomic number
D.
radioactivity number
E.
mass number

C.
atomic number

Which particle found in the nucleus of the atom has no electrical charge?

A.
neutron
B.
electron
C.
proton
D.
neutrino
E.
positron

A.
neutron

Which type of radioactive decay emits electrons?
A.
alpha
B.
beta
C.
gamma
D.
positive
E.
negative

B.
beta

Which of the following elements poses a health threat to people in a well-insulated, tightly sealed building?
A.
uranium
B.
radium
C.
xenon
D.
radon
E.
chlorine

d. radon

This type of radioactive decay releases energy from the nucleus without changing the element.
A.
alpha
B.
beta
C.
gamma
D.
positive
E.
negative

c. gamma

The nucleus of this element is created during alpha decay.
A.
hydrogen
B.
helium
C.
uranium
D.
radon
E.
xenon

b helium

The total number of protons and neutrons in the nucleus of an atom is called the
A.
half-life
B.
atomic mass
C.
atomic number
D.
radioactivity number
E.
mass number

e. mass number

During nuclear fission, mass is converted into
A.
hydrogen gas
B.
xenon
C.
energy
D.
protons
E.
electrons

c. energy

This force holds the atomic nucleus together.
A.
the weak force
B.
the strong force
C.
covalent bonds
D.
ionic bonds
E.
hydrogen bonds

b. the strong force

Radium and polonium were first isolated by
A.
Albert Einstein
B.
Antoine Becquerel
C.
Marie Curie
D.
Ernest Rutherford
E.
Wolfgang Pauli

c. marie curie

The existence of radioactivity was first discovered by
A.
Albert Einstein
B.
Antoine Becquerel
C.
Marie Curie
D.
Ernest Rutherford
E.
Wolfgang Pauli

b. antoine becquerel

The existence of alpha decay in radioactive uranium was first discovered by
A.
Albert Einstein
B.
Antoine Becquerel
C.
Marie Curie
D.
Ernest Rutherford
E.
Wolfgang Pauli

d. ernest rutherford

A form of an element having different numbers of neutrons in its nucleus is called

A.
an isotope
B.
an isomer
C.
a molecule
D.
a neutrino
E.
radioactive

a. an isotope

During the nuclear fission reaction in a reactor that generates electricity, uranium-235 releases
A.
protons
B.
electrons
C.
neutrons
D.
beta particles
E.
gamma rays

c. neutrons

The tiny particle released during beta decay that has no electric charge is
A.
an electron
B.
a proton
C.
a neutron
D.
a neutrino
E.
an alpha particle

d. a neutrino

The complete radioactive decay of radioactive uranium produces the stable element
A.
hydrogen
B.
lead
C.
helium
D.
xenon
E.
radon

b lead

The time it takes for half of the atoms of a given amount of a radioactive element to spontaneously decay is termed its

A.
half-life
B.
atomic mass
C.
atomic number
D.
radioactivity number
E.
mass number

a. half-life

The atomic number of oxygen is 8. Oxygen-18 must have ____ neutrons in its nucleus.
A.
6
B.
8
C.
9
D.
10
E.
18

d. 10

A radioactive element that can be injected into a person to detect the presence of diseased cells that will accumulate the element is called
A.
a proton
B.
a tracer
C.
an electron
D.
a neutrino
E.
a decay product

b. a tracer

The combination of two atomic nuclei is referred to as fusion, whereas the splitting of a single atomic nucleus is called
A.
gamma decay
B.
alpha decay
C.
fission
D.
beta decay
E.
electron decay

c. fission

The greenhouse effect is due to the buildup of __________ in the atmosphere.
A.
ozone
B.
smog
C.
carbon dioxide
D.
oxygen
E.
nitrogen

c. carbon dioxide

This famous ecologist studied populations of animals on small islands.

A.
Edward Wilson
B.
Douglas MacAyael
C.
Milutin Milankovitch
D.
Charles Richter
E.
Alfred Wegener

a. edward wilson

The element chlorine converts ozone molecules to ______ molecules in the upper atmosphere.
A.
nitrogen
B.
carbon dioxide
C.
acid rain
D.
oxygen
E.
hydrocarbons

d. oxygen

The element chlorine converts ozone molecules to ______ molecules in the upper atmosphere.
A.
nitrogen
B.
carbon dioxide
C.
acid rain
D.
oxygen
E.
hydrocarbons

b. the specific way in which it obtains energy adn materials

The molecule _____ is composed of three oxygen atoms instead of the usual two.

A.
ozone
B.
smog
C.
hydrocarbon
D.
nitrous oxide
E.
sulfur dioxide

a. ozone

The living organisms in a given area and their physical environment is knows as
A.
a population
B.
a community
C.
an ecosystem
D.
a biosphere
E.
an ecologic niche

c. an ecosystem

The ozone layer in the atmosphere is able to block
A.
infrared radiation
B.
ultraviolet radiation
C.
gamma rays
D.
ultrared radiation
E.
infraviolet radiation

b ultraviolet radiation

An increase in the concentration of carbon dioxide in the atmosphere is contributing to

A.
the greenhouse effect
B.
the ozone hole
C.
a decrease in global temperature
D.
an increase in animal extinction
E.
acid rain

a. the greenhouse effect

Which of the following is NOT considered to be a component of air pollution?
A.
sulfur dioxide
B.
nitrogen dioxide
C.
nitrogen monoxide
D.
carbon monoxide
E.
nitrogen

e. nitrogen

In a typical ecosystem, which percentage of energy in a plant becomes available to an animal that eats the plant?

A.
10%
B.
20%
C.
50%
D.
90%
E.
100%

a. 10%

Animals that eat plants are referred to as
A.
omnivores
B.
herbivores
C.
carnivores
D.
decomposers
E.
predators

b. herbivores

The final trophic level in all ecosystems consists of
A.
omnivores
B.
herbivores
C.
carnivores
D.
decomposers
E.
predators

d. decomposers

A food web consists of
A.
all of the herbivores in an ecosystem
B.
all of the carnivores in an ecosystem
C.
all of the predators in an ecosystem
D.
all of the prey in an ecosystem
E.
all of the organisms in an ecosystem

e. all of the organisms in an ecosystem

Animals that eat other animals are called
A.
omnivores
B.
herbivores
C.
carnivores
D.
decomposers
E.
predators

c. carnivores

Energy and matter pass through different organisms in an ecosystem at different steps called
A.
populations
B.
communities
C.
species
D.
trophic levels
E.
ecologic niches

d. trophic levels

Ecology is the study of
A.
the development of living organisms
B.
the interactions of living organisms with their environment
C.
the production of ozone
D.
the production of acid rain
E.
the effects of homeostasis

b. the interactions of living organisms with their environemnt

The uppermost layer of the atmosphere is the

A.
ionosphere
B.
stratosphere
C.
troposphere
D.
mesosphere
E.
ecosphere

a. ionosphere

The layer of the atmosphere closest to the surface of the Earth is the
A.
ionosphere
B.
stratosphere
C.
troposphere
D.
mesosphere
E.
ecosphere

c. troposphere

Acid rain is caused by the presence of _____ in rainfall.
A.
sulfuric acid
B.
carbonic acid
C.
nitric acid
D.
none of these are correct
E.
all of these are correct

e. all of these are not correct

At the present time, the United States produces most of its energy from
A.
wood
B.
nuclear reactors
C.
coal
D.
oil and gas
E.
hydroelectric dams

d. oil and gas

The proteins in living organisms are composed of _____ different kinds of amino acids.
A.
five
B.
ten
C.
twenty
D.
thirty
E.
fifty

c. twenty

Two or more polypeptide chains joined together form the _____ structural level of a protein.
A.
primary
B.
secondary
C.
tertiary
D.
quaternary
E.
quinternary

d. quaternary

A fat that does not have double bonds between its carbon atoms is said to be

A.
saturated
B.
unsaturated
C.
semisaturated
D.
polysaturated
E.
polyunsaturated

a. saturated

The twisting and folding of a straight polypeptide chain produces the _______ level of protein structure.
A.
primary
B.
secondary
C.
tertiary
D.
quaternary
E.
quinternary

b. secondary

A carbohydrate that is composed of numerous sugar molecules is called
A.
a monosaccharide
B.
a polysaccharide
C.
a protein
D.
a lipid
E.
an enzyme

b. a polysaccharide

A molecule that causes a reaction to speed up without being used up itself is
A.
a monosaccharide
B.
a polysaccharide
C.
a starch
D.
a lipid
E.
an enzyme

e. an enzyme

Cellulose is the proper name for
A.
lipids
B.
plant fiber
C.
monosaccharides
D.
carbohydrates
E.
waxes

b. plant fiber

Any molecule that contains carbon is called
A.
a lipid
B.
inorganic
C.
a monosaccharide
D.
a carbohydrate
E.
organic

e. organic

A type of lipid that has double bonds between some of its carbon molecules is said to be
A.
saturated
B.
unsaturated
C.
semisaturated
D.
polysaturated
E.
supersaturated

b. unsaturated

Any organic molecule in living organisms that contains only carbon, hydrogen, and oxygen is
A.
a lipid
B.
inorganic
C.
a protein
D.
a carbohydrate
E.
organic

d. carbohydrate

This level of structure in a polypeptide involves the exact sequence of amino acids.

A.
primary
B.
secondary
C.
tertiary
D.
quaternary
E.
quinternary

a. primary

A carbohydrate containing only one sugar unit is
A.
a lipid
B.
inorganic
C.
a monosaccharide
D.
a carbohydrate
E.
organic

c. a monosaccharide

A good example of a water-soluble vitamin is
A.
vitamin A
B.
vitamin D
C.
vitamin E
D.
vitamin K
E.
vitamin C

e. vitamin c

hospholipids are important because
A.
they are a prime source for energy
B.
they form the cell membrane
C.
they form the mineral of bone
D.
they are water-soluble vitamins
E.
they are fat-soluble vitamins

b. they form the cell membrane

The eight amino acids that cannot be synthesized by the body are called

A.
essential
B.
inorganic
C.
unsaturated
D.
polysaturated
E.
polyunsaturated

a. essential

A peptide bond is the type of bond formed between
A.
two monosaccharides
B.
two amino acids
C.
two sugars
D.
two lipids
E.
two disaccharides

b. two amino acids

A polysaccharide would never contain
A.
carbon
B.
hydrogen
C.
oxygen
D.
nitrogen
E.
sugars

d. nitrogen

The first organic molecule to be synthesized in the laboratory was
A.
table sugar
B.
grape sugar
C.
urea
D.
alcohol
E.
water

c. urea

Phosphorus, iron, and zinc are examples of _____ within our bodies.
A.
vitamins
B.
minerals
C.
carbohydrates
D.
proteins
E.
enzymes

b. minerals

The simplest carbohydrates are

A.
sugars
B.
starches
C.
disaccharides
D.
polysaccharides
E.
phospholipids

a. sugars

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