Biology 5A: Test Your Understanding (1)

Questão 1 de 30

1

All the organisms on your campus make up
Which of the following is a correct sequence of levels in life’s
hierarchy, proceeding downward from an individual animal?

Selecione uma das seguintes:

an ecosystem.
a community.
a population.
a taxonomic domain.

Explicação

Questão 2 de 30

1

Which of the following is a correct sequence of levels in life’s
hierarchy, proceeding downward from an individual animal?

Selecione uma das seguintes:

organism, brain, organ system, nerve cell
organ system, nervous tissue, brain, nerve cell
organism, organ system, tissue, cell, organ
nervous system, brain, nervous tissue, nerve cell

Explicação

Questão 3 de 30

1

Which of the following correctly list the levels of biological organization from largest to smallest?

Selecione uma das seguintes:

Organelles → Cells → Tissues → Organs & Organ Systems → Organisms → Populations → Communities → Ecosystems → Biosphere
Cells → Tissues → Organelles → Organs & Organ Systems → Organisms → Populations → Communities → Ecosystems → Biosphere
Biosphere → Ecosystems → Communities → Populations → Organisms → Organs & Organ Systems → Tissues → Molecules → Cells → Organelles
Biosphere → Ecosystems → Populations → Communities → Organisms → Organs & Organ Systems → Tissues → Molecules → Cells → Organelles
Biosphere → Ecosystems → Populations → Communities → Organisms → Organs & Organ Systems → Organelles → Molecules → Tissues → Cells

Explicação

Questão 4 de 30

1

In the term trace element, the adjective trace means that

Selecione uma das seguintes:

the element is required in very small amounts.
the element can be used as a label to trace atoms through
an organism’s metabolism.
the element is very rare on Earth.
the element enhances health but is not essential for the organism’s
long-term survival.

Explicação

Questão 5 de 30

1

Compared with 31 P, the radioactive isotope 32 P has

Selecione uma das seguintes:

a different atomic number.
one more proton.
one more electron.
one more neutron.

Explicação

Questão 6 de 30

1

The reactivity of an atom arises from

Selecione uma das seguintes:

the average distance of the outermost electron shell from
the nucleus.
the existence of unpaired electrons in the valence shell.
the sum of the potential energies of all the electron shells.
the potential energy of the valence shell.

Explicação

Questão 7 de 30

1

Which statement is true of all atoms that are anions?

Selecione uma das seguintes:

The atom has more electrons than protons.
The atom has more protons than electrons.
The atom has fewer protons than does a neutral atom of the
same element.
The atom has more neutrons than protons.

Explicação

Questão 8 de 30

1

Which of the following statements correctly describes any
chemical reaction that has reached equilibrium?

Selecione uma das seguintes:

The concentrations of products and reactants are equal.
The reaction is now irreversible.
Both forward and reverse reactions have halted.
The rates of the forward and reverse reactions are equal.

Explicação

Questão 9 de 30

1

We can represent atoms by listing the number of protons,
neutrons, and electrons—for example, 2p + , 2n 0 , 2e - for helium.
Which of the following represents the 18 O isotope of oxygen?

Selecione uma das seguintes:

7p + , 2n 0 , 9e -
8p + , 10n 0 , 8e -
9p + , 9n 0 , 9e -
10p + , 8n 0 , 9e -

Explicação

Questão 10 de 30

1

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur
atom, predict the molecular formula of the compound.

Selecione uma das seguintes:

HS
HS2
H2S
H4S

Explicação

Questão 11 de 30

1

What coefficients must be placed in the following blanks so
that all atoms are accounted for in the products?
C 6 H 12 O 6 -----> C 2 H 6 O + CO 2

Selecione uma das seguintes:

2;1
3;1
1;3
2;2

Explicação

Questão 12 de 30

1

Draw Lewis dot structures for each hypothetical
molecule shown below, using the correct number of valence
electrons for each atom. Determine which molecule makes
sense because each atom has a complete valence shell and each
bond has the correct number of electrons. Explain what makes
the other molecules nonsensical, considering the number of
bonds each type of atom can make. (which is wrong)

Selecione uma ou mais das seguintes:

Structure A
Structure B

Explicação

Questão 13 de 30

1

We can be sure that a mole of table sugar and a mole of vitamin
C are equal in their

Selecione uma das seguintes:

Mass
Volume
Number of Atoms
Number of Molecules

Explicação

Questão 14 de 30

1

Measurements show that the pH of a particular lake is 4.0.
What is the hydrogen ion concentration of the lake?

Selecione uma das seguintes:

4.0 M
10^ (-10) M
10^ (-4) M
10^ (4) M

Explicação

Questão 15 de 30

1

What is the hydroxide ion concentration of the lake described
in question 3 (pH of a particular lake is 4.0)?

Selecione uma das seguintes:

10^(-10) M
10^(-4) M
10^(-7) M
10.0 M

Explicação

Questão 16 de 30

1

A slice of pizza has 500 kcal. If we could burn the pizza and use
all the heat to warm a 50-L container of cold water, what would
be the approximate increase in the temperature of the water?
(Note: A liter of cold water weighs about 1 kg.)

Selecione uma das seguintes:

50°C
5°C
100°C
10°C

Explicação

Questão 17 de 30

1

Draw the hydration shells that form around a potassium
ion and a chloride ion when potassium chloride (KCl)
dissolves in water. Label the positive, negative, and partial
charges on the atoms.

The image below correctly display this.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 18 de 30

1

Selecione das listas do Menu para completar o texto.

QUESTION:
In agricultural areas, farmers pay close attention to the weather
forecast. Right before a predicted overnight freeze, farmers
spray water on crops to protect the plants. Use the properties
of water to explain how this method works. Be sure to mention
why hydrogen bonds are responsible for this phenomenon.

ANSWER:
Due to intermolecular hydrogen bonds, water has a ( high, low ) specific heat (the
amount of heat required to increase the temperature of water by 1°C). When water
is heated, much of the heat is absorbed in ( breaking, forming ) hydrogen bonds before the
water molecules increase their motion and the temperature increases. Conversely,
when water is cooled, many H bonds are ( formed, broken ), which ( releases, absorbs ) a significant
amount of heat. This ( release, absorbsion ) of heat can provide some protection against freezing
of the plants’ leaves, thus protecting the cells from damage.

Explicação

Questão 19 de 30

1

Which functional group is not present in this molecule?

Selecione uma das seguintes:

Carboxyl
sulfhydryl
hydroxl
amino

Explicação

Questão 20 de 30

1

Which of the following hydrocarbons has a double bond in its
carbon skeleton?

Selecione uma das seguintes:

C3H8
C2H6
C2H4
C2H2

Explicação

Questão 21 de 30

1

Which chemical group is most
likely to be responsible for an organic molecule behaving as a
base

Selecione uma das seguintes:

hydroxyl
amino
carbonyl
phosphate

Explicação

Questão 22 de 30

1

Which action could produce a carbonyl group?

Selecione uma das seguintes:

the replacement of the —OH of a carboxyl group with
hydrogen
the addition of a thiol to a hydroxyl
the addition of a hydroxyl to a phosphate
the replacement of the nitrogen of an amine with oxygen

Explicação

Questão 23 de 30

1

Which of the following categories includes all others in the
list?

Selecione uma das seguintes:

monosaccharide
polysaccharide
starch
carbohydrate

Explicação

Questão 24 de 30

1

The enzyme amylase can break glycosidic linkages between
glucose monomers only if the monomers are in the α form.
Which of the following could amylase break down?

Selecione uma das seguintes:

glycogen, starch, and amylopectin
glycogen and cellulose
cellulose and chitin
starch, chitin, and cellulose

Explicação

Questão 25 de 30

1

Which of the following is true of unsaturated fats?

Selecione uma das seguintes:

They are more common in animals than in plants.
They generally solidify at room temperature.
They have double bonds in the carbon chains of their fatty
acids.
They contain more hydrogen than do saturated fats having
the same number of carbon atoms.

Explicação

Questão 26 de 30

1

The structural level of a protein least affected by a disruption
in hydrogen bonding is the

Selecione uma das seguintes:

primary level.
secondary level.
tertiary level.
quaternary level.

Explicação

Questão 27 de 30

1

Enzymes that break down DNA catalyze the hydrolysis of the
covalent bonds that join nucleotides together. What would
happen to DNA molecules treated with these enzymes?

Selecione uma das seguintes:

The two strands of the double helix would separate.
The phosphodiester linkages of the polynucleotide backbone
would be broken.
The pyrimidines would be separated from the deoxyribose
sugars.
All bases would be separated from the deoxyribose sugars.

Explicação

Questão 28 de 30

1

.

Selecione uma das seguintes:

Explicação

Questão 29 de 30

1

	Criado por Jade P mais de 7 anos atrás

Chapters: 1-8

Biology 5A: Test Your Understanding (1)

Questão 1 de 30

All the organisms on your campus make up Which of the following is a correct sequence of levels in life’s hierarchy, proceeding downward from an individual animal?

Selecione uma das seguintes:

Explicação

Questão 2 de 30

Which of the following is a correct sequence of levels in life’s hierarchy, proceeding downward from an individual animal?

Selecione uma das seguintes:

Explicação

Questão 3 de 30

Which of the following correctly list the levels of biological organization from largest to smallest?

Selecione uma das seguintes:

Explicação

Questão 4 de 30

In the term trace element, the adjective trace means that

Selecione uma das seguintes:

Explicação

Questão 5 de 30

Compared with 31 P, the radioactive isotope 32 P has

Selecione uma das seguintes:

Explicação

Questão 6 de 30

The reactivity of an atom arises from

Selecione uma das seguintes:

Explicação

Questão 7 de 30

Which statement is true of all atoms that are anions?

Selecione uma das seguintes:

Explicação

Questão 8 de 30

Which of the following statements correctly describes any chemical reaction that has reached equilibrium?

Selecione uma das seguintes:

Explicação

Questão 9 de 30

We can represent atoms by listing the number of protons, neutrons, and electrons—for example, 2p + , 2n 0 , 2e - for helium. Which of the following represents the 18 O isotope of oxygen?

Selecione uma das seguintes:

Explicação

Questão 10 de 30

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound.

Selecione uma das seguintes:

Explicação

Questão 11 de 30

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C 6 H 12 O 6 -----> ____ C 2 H 6 O + ____ CO 2

Selecione uma das seguintes:

Explicação

Questão 12 de 30

Selecione uma ou mais das seguintes:

Explicação

Questão 13 de 30

We can be sure that a mole of table sugar and a mole of vitamin C are equal in their

Selecione uma das seguintes:

Explicação

Questão 14 de 30

Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?

Selecione uma das seguintes:

Explicação

Questão 15 de 30

What is the hydroxide ion concentration of the lake described in question 3 (pH of a particular lake is 4.0)?

Selecione uma das seguintes:

Explicação

Questão 16 de 30

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

Selecione uma das seguintes:

Explicação

Questão 17 de 30

Draw the hydration shells that form around a potassium ion and a chloride ion when potassium chloride (KCl) dissolves in water. Label the positive, negative, and partial charges on the atoms. The image below correctly display this.

Selecione uma das opções:

Explicação

Questão 18 de 30

Selecione das listas do Menu para completar o texto.

Explicação

Questão 19 de 30

Which functional group is not present in this molecule?

Selecione uma das seguintes:

Explicação

Questão 20 de 30

Which of the following hydrocarbons has a double bond in its carbon skeleton?

Selecione uma das seguintes:

Explicação

All the organisms on your campus make up
Which of the following is a correct sequence of levels in life’s
hierarchy, proceeding downward from an individual animal?

Which of the following is a correct sequence of levels in life’s
hierarchy, proceeding downward from an individual animal?

Which of the following statements correctly describes any
chemical reaction that has reached equilibrium?

We can represent atoms by listing the number of protons,
neutrons, and electrons—for example, 2p + , 2n 0 , 2e - for helium.
Which of the following represents the 18 O isotope of oxygen?

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur
atom, predict the molecular formula of the compound.

What coefficients must be placed in the following blanks so
that all atoms are accounted for in the products?
C 6 H 12 O 6 -----> C 2 H 6 O + CO 2

We can be sure that a mole of table sugar and a mole of vitamin
C are equal in their

Measurements show that the pH of a particular lake is 4.0.
What is the hydrogen ion concentration of the lake?

What is the hydroxide ion concentration of the lake described
in question 3 (pH of a particular lake is 4.0)?

A slice of pizza has 500 kcal. If we could burn the pizza and use
all the heat to warm a 50-L container of cold water, what would
be the approximate increase in the temperature of the water?
(Note: A liter of cold water weighs about 1 kg.)

Draw the hydration shells that form around a potassium
ion and a chloride ion when potassium chloride (KCl)
dissolves in water. Label the positive, negative, and partial
charges on the atoms.

The image below correctly display this.

Which of the following hydrocarbons has a double bond in its
carbon skeleton?

Which chemical group is most
likely to be responsible for an organic molecule behaving as a
base

Which of the following categories includes all others in the
list?

The enzyme amylase can break glycosidic linkages between
glucose monomers only if the monomers are in the α form.
Which of the following could amylase break down?

The structural level of a protein least affected by a disruption
in hydrogen bonding is the

Enzymes that break down DNA catalyze the hydrolysis of the
covalent bonds that join nucleotides together. What would
happen to DNA molecules treated with these enzymes?

Which of the following pairs of base sequences could form a
short stretch of a normal double helix of DNA?