Which of the following substances account for more than 95% of the human body?

Carbon, Hydrogen, Oxygen, Nitrogen

The parts of a protein that change when it denatures are..

the secondary and tertiary structures

The informational content of DNA and RNA is in the nitrogenous bases because

bases are of several types and therefore form a sequence

Organic molecules___, whereas inorganic molecules___.

contain carbon; do not contain carbon

A complete atom is electrically neutral because the number of

negative electrons and positive protons are equal

composed of building blocks called nucleotides

saturated fats___ than unsaturated fats

have more single carbon-carbon bonds

The pH scale measures the...

concentration of hydrogen ions in solution

A simple carbohydrate

has a molecular formula of C6H12O6

In the body, oxygen...

releases energy from glucose during cellular respiration

An atom that has 3 electrons in its second shell and a filled first shell will...

lose 3 electrons from its second shell

protein tht speeds up chem react w/o bein changedor depleted

Atomic number equals the number of___ and atomic weight equals the___

protons; number of protons plus neutrons

DNA and RNA differ in that...

DNA holds genetic info & RNA use info to synthesize protein

The 3 dimensional shape of a molecule, such as protein

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Questions 41

Answers

1
Which of the following substances account for more than 95% of the human body?
Calcium, Phosphorus, Hydrogen, Nitrogen
Calcium, Hydrogen, Oxygen, Nitrogen
Carbon, Phosphorus, Oxygen, Hydrogen
Carbon, Hydrogen, Oxygen, Nitrogen
2
Chemistry is important to the study of physiology because
all above
we eat chemicals, drugs are chemicals
chem react enable our body to extract energy from nutrients
body function reflect cellular functions reflect chem change
3
Which of the following substances is an element?
salt
glucose
water
iron
4
A chemical reaction in which pairs of different molecules trade positions is a(n)
decomposition reaction
synthesis reaction
exchange reaction
reversible reaction
5
The parts of a protein that change when it denatures are..
the primary and secondary structures
the secondary and tertiary structures
the tertiary and quaternary structures
the amino acid sequence and secondary structure
6
A protein can denature when...
hydrogen bonds form
bonds between carbon and oxygen break
pep tide bonds break
weak hydrogen bonds break
7
The informational content of DNA and RNA is in the nitrogenous bases because
the bases are also parts of amino acids
the sugars and phosphates vary too much
they contain nitrogen
bases are of several types and therefore form a sequence
8
Organic molecules___, whereas inorganic molecules___.
do not contain carbon; do contain carbon
are small; are very large
contain carbon; do not contain carbon
contain carbon; do not dissolve in water
9
A complete atom is electrically neutral because the number of
negatively charged electrons and neutral neutrons are equal
positively charged protons and neutral neutrons are equal
electrons is greater than the number of protons and neutrons
negative electrons and positive protons are equal
10
Which of the following compounds is not hydrophilic?
proteins
carbohydrates
nucleic acids
lipids
11
Bases reacting with acids form____ and water
lipids
buffers
salts
proteins
12
An acid reacting with a base is...
an exchange reaction
hydrolysis
a synthesis recaction
a decomposition reaction
13
A decomposition reaction can be symbolized by...
C+D--> AB
A+B--> C+D
A+B --> AB
AB--> A + B
14
The difference in hydrogen ion concentration between solutions with pH 4 and pH 5 is
fivefold
twofold
twentyfold
tenfold
15
Nucleic acids are
sources of cellular energy
structural molecule that dnt have function other thn support
composed of building blocks called nucleotides
very small, simple molecules
16
In a covalent bond
oppositely charges atoms repel
atoms share pairs of electrons
one atom shares and another atom gains electrons
oppositely charge atoms attract
17
The first electron shell of an atom can hold a maximum of...
4 electrons
8 electrons
2 electrons
1 electron
18
The ___ uses the element iodide
thyroid
spleen
liver
thymus
19
The atomic weight of an element whose atoms contain 8 protons, 8 electrons, and 8 neutrons is..
8
32
24
16
20
saturated fats___ than unsaturated fats
have fewer hydrogen atoms bonded to carbon atoms
are more soluble in water
have more single carbon-carbon bonds
are heavier
21
The pH scale measures the...
concentration of hydrogen ions in solution
number of molecules of salts dissolved in water
strength of an electrical current that a solution carries
number of hydroxyl ions in water
22
A simple carbohydrate
consists of several joined chains
is a building block of protein
has a molecular formula of C6H12O6
has only one nucleotide
23
A triglyceride consists of
3 glucose molecules
1 amino group and 1 carboxyl group
1 glycerol and 3 fatty acids
3 amino acids
24
Which of the following is the most abundant inorganic substance in cells?
protein
water
carbohydrate
lipid
25
In the body, oxygen...
helps regulate body temperature
is used in various metabolic processes
releases energy from glucose during cellular respiration
reacts with water to form carbonic acid
26
A solution that contains equal numbers of hydrogen and hydroxyl ions is?
alkaline
acidic
basic
neutral
27
The four most abundant elements in the human body are...
O, C, H, and N
Na, Mg, P and K
Ca, C, O and Na
N, H, Mg, and K
28
An atom that has 3 electrons in its second shell and a filled first shell will...
lose all of the electrons from its first shell
lose all of the electrons from its first and second shells
lose 3 electrons from its second shell
gain 2 electrons in its second shell
29
The unique, three-dimensional structure of a protein molecule is determined largely by..
covalent bonds
oxygen bonds
hydrogen bonds
ionic bonds
30
An enzyme is a
protein that functions as a hormone
fibrous protein that is part of certain tissues in the body
protein that inhibits chem react by bein changed or depleted
protein tht speeds up chem react w/o bein changedor depleted
31
The type of organic molecule tat can replicate is a ...
lipid
nucleic acid
carbohydrate
protein
32
Which of the following is not organic?
enzymes
oxygen
nucleic acids
lipids
33
Matter is composed of ___, which are composed of____.
molecules; elements
atoms; molecules
chemicals; molecules
elements; atoms
34
Table sugar breaking down into glucose and fructose is a(n)____ reaction
synthesis
decompositon
hydrolysis
exchange reaction
35
Atomic number equals the number of___ and atomic weight equals the___
protons in the nucleus; weight of all the electrons
protons; number of protons plus neutrons
atoms in an element; weight of all the atoms
neutrons in the nucleus; number of protons plus electrons
36
DNA and RNA differ in that...
DNA holds genetic info & RNA use info to synthesize protein
RNA has deoxyribose and DNA has ribose
RNA is double-stranded and DNA is single-stranded
RNA holds genetic info & DNA uses info to synthesize protein
37
A person has alkalosis if the blood pH...
rises above 3.4
rises above 7.0
drops below 7.0
rises above 7.4
38
Synthesis reactions are particularly important in the body for...
growth of body parts
neutralization of acids by buffers
digestion of food products
release of energy
39
DNA
is important in building carbohydrates
helps synthesize nucleic acids
is important in building fats
stores genetic information
40
The atoms of the isotopes of a particular element vary in the number of..
protons
electrons
nuclei
neutrons
41
Conformation is
the ability of RNA to copy itself
energy held in the bonds of an organic molecule, (protein)
The 3 dimensional shape of a molecule, such as protein
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