Ch. 2 A&P

25 July 2022
4.7 (114 reviews)
83 test answers

Unlock all answers in this set

Unlock answers (79)
question
All amino acids (such as the four represented in the figure) contain ______. a. a nitrogen-containing base and a pentose sugar b. an amine group and a carboxyl group c. phosphorous and nitrogen d. an amine group and a fatty acid
answer
b. an amine group and a carboxyl group
question
Each specific amino acid has a unique ______. a. R group b. carboxyl group c. phosphate group d. amino group
answer
a. R group
question
Which of the following statements is true regarding the enzyme-catalyzed reaction (B) compared to the uncatalyzed reaction (A)? a. The products of the reaction with enzyme contain more chemical potential energy. b. The reaction in the presence of enzyme releases more energy. c. The reaction in the presence of enzyme will form larger products. d. Less energy input is required to start the reaction in the presence of enzyme. e. All of the listed responses are true.
answer
d. Less energy input is required to start the reaction in the presence of enzyme.
question
Choose the correctly matched pair. a. amino acid: carbohydrate b. nucleotide: DNA c. monosaccharide: lipid d. glycerol and fatty acids: RNA
answer
b. nucleotide: DNA
question
What are the two fundamental roles of DNA? a. to carry out the genetic instructions for protein synthesis, and replicate itself before cell division b. to provide and carry out the instructions for protein synthesis c. to carry out the orders for protein synthesis issued by RNA, and to control genetic expression by shutting down genes or altering their expression d. to provide the instructions for protein synthesis, and replicate itself before cell division
answer
d. to provide the instructions for protein synthesis, and replicate itself before cell division
question
The major function of RNA is to carry out the genetic instructions for protein synthesis. (T/F)
answer
True
question
ATP is an unstable, high-energy molecule that provides body cells with a form of energy that is immediately usable. (T/F)
answer
True
question
Although his cholesterol levels were not high, Mr. Martinez read that cholesterol was bad for his health, so he eliminated all foods and food products containing this molecule. He later found that his cholesterol level dropped only 20%. Why did it not drop more?
answer
Cholesterol is produced naturally by the liver, in addition to being ingested in foods.
question
Why can DNA be used to "fingerprint" a suspect in a crime? a. The sequence, but not fragmentation pattern, of a person's DNA is unique to that individual. b. The sequence and fragmentation pattern of a person's DNA is unique to that individual. c. DNA cannot be used to identify a suspect: all humans contain the same genes and DNA is, therefore, not unique to an individual. d. The DNA determines the pattern of an individual's fingerprint, and can be 'read' to determine the fingerprint pattern for matching in a database.
answer
b. The sequence and fragmentation pattern of a person's DNA is unique to that individual.
question
Which of the following is not true of proteins? a. They may be denatured or coagulated by heat or acidity. b. They have both functional and structural roles in the body.. c. They appear to be the molecular carriers of coded hereditary information. d. Their function depends on their three-dimensional shape
answer
c. They appear to be the molecular carriers of coded hereditary information.
question
Which organic molecules form the major structural materials of the body? a. nucleic acids b. carbohydrates c. proteins d. lipids
answer
c. proteins
question
What is the primary energy-transferring molecule in cells? a. RNA b. ATP c. DNA d. TACT
answer
b. ATP
question
It is the difference in the R group that makes each amino acid chemically unique. (T/F)
answer
True
question
Glycogen, the storage form of glucose, is primarily stored in muscle tissue only. (T/F)
answer
False
question
All organic compounds contain carbon. (T/F)
answer
True
question
Lipids are a poor source of stored energy. (T/F)
answer
False
question
Inorganic compounds (examples and characteristics)
answer
water, salts, and many acids and bases. DO NOT CONTAIN CARBON
question
organic compounds (examples and characteristics)
answer
carbohydrates, fats, proteins, and nucleic acids. contain carbon, usually large, and are covalently bonded. many are polymers
question
how are organic compounds synthesized and broken down
answer
synthesized by dehydration synthesis and broken down by hydrolysis reactions
question
carbohydrates
answer
sugars and starches, contain C, H, and O. function as major source of cellular fuel and structural molecules
question
three classes of carbohydrates
answer
monosaccharides, disaccharides, and polysaccharides
question
examples of carbohydrates
answer
glucose and ribose sugar
question
monosaccharides
answer
simple sugars contain three to seven carbon atoms
question
disaccharides
answer
double sugars, too large to pass through cell membranes
question
polysaccharides
answer
polymers of simple sugars such as starch and glycogen, not very soluable
question
Lipids
answer
contain C, H, O and sometimes P, insoluable in water (bc of little oxygen).
question
main types of lipids
answer
neutral fats or triglycerides, phospholipids, steroids, eicosanoids
question
triglycerides characteristics
answer
stored in hypodermis; neutral fats (solid fats and liquid oils)
question
what are triglycerides composed of
answer
three fatty acids bonded to a glycerol molecule (3:1 ratio)
question
functions of triglycerides
answer
energy storage, insulation, and protection against infection; synthesized by dehydration synthesis
question
types of saturation of fatty acids
answer
saturated & unsaturated
question
saturated fatty acids
answer
high degree of single bonds; solid animal fats (butter) "bad fats"
question
unsaturated fatty acids
answer
high degree of double bonds; one or more double bonds between C atoms; reduced number of H atoms; olive oil, peanut, sunflower (good fats)
question
phospholipids structure
answer
modified triglycerides contain glycerol + two fatty acids and a phosphorous containing group
question
phospholipids characteristics
answer
head and tail regions have different properties (hydrophilic and hydrophobic)
question
hydrophilic
answer
phosphorous containg group w/ a polar head
question
hydrophobic structure
answer
glycerol & two fatty acids
question
phospholipids importance
answer
important in cell membrane structure (semipermeable)
question
steroid structure
answer
interlocking four-ring structure
question
steroid examples
answer
estrogen, testerone, cholesterol, vitamin D, bile salts; strengthens cell membrane
question
eicosanoids
answer
found in cell membranes; many types
question
eicosanoids derived from
answer
a fatty acid in cell membranes
question
eicosanoids examples
answer
oxytocin, leukotrienes
question
tromozines
answer
involved in plateles that activate process that makes platelletes
question
other fat-soluble vitamins
answer
vitamins A, E, and K
question
Lipoproteins
answer
HDL (good cholesterol) takes extra fat to liver; transport fats in the blood
question
LDL
answer
bad cholesterol
question
proteins
answer
polymers of amino acids joined by peptide bonds; contain C, H, O, N and sometimes S and P
question
dipeptide
answer
2 amino acids
question
tripeptide
answer
3 amino acids
question
oligopeptide
answer
10+ amino acids
question
polypeptide
answer
15+ amino acids
question
structural levels of proteins
answer
primary, secondary, tertiary, and quaternary
question
single most abundant protein
answer
collagen
question
tertiary structure (characteristic and examples)
answer
heavy twisting (hormones, antibodies, enzymes)
question
which structure does hydrogen destruction affect
answer
secondary
question
quaternary
answer
hemaglobin
question
fibrous proteins
answer
strandlike, water insoluable, and stable
question
examples of fibrous proteins
answer
keratin, elastin, collagen, and certain contractile fibrs
question
globular proteins
answer
compact, spherical, water soluable and sensitive to environmental changes; specific functional regions
question
examples of globular proteins
answer
antibodies, hormones, molecular chaperones, and enzymes
question
which proteins are structural
answer
fibrous
question
which proteins are functional
answer
globular
question
protein denaturation
answer
shape change and disruption of active sites due to environmental changes (pH drop or increased temperature)
question
molecular chaperones
answer
stress proteins/heat shock proteins
question
where are molecular chaperones found
answer
present in traumatized tissue
question
importance of molecular chaperones
answer
important for homeostasis, ensure quick and accurate folding of proteins, assist translocation of proteins and ions across membranes, promote breakdown of denatured proteins, help trigger the immune response
question
enzymes
answer
biological catalysts; lower activation energy and increase the speed of a reaction
question
characteristics of enzymes
answer
often named for reaction they catalyze
question
functional enzymes consist of
answer
aponenzyme (protein) and either a cofactor (metal ion) or coenzyme (a vitamin)
question
nucleic acids
answer
DNA and RNA (largest molecules in the body) contain C, O, H, N, and P.
question
building block of nucleic acids
answer
nucleotides
question
nucleotides structure
answer
N-containing base, a pentose sugar, and a phosphate group
question
DNA made up of/ structure
answer
four bases (A,G, C and T); double stranded helicalmolecule in the nucleus
question
DNA purpose
answer
provides instruction for protein synthesis; replicates before cell division for genetic continuity
question
RNA made up of/structure
answer
four bases (A, G, C, and U); single stranded molecule mostly active outside of nucleus
question
RNA purpose
answer
three varieties of RNA carry out DNA orders for proteins
question
RNA types
answer
messenger, transfer, and ribosomal
question
messenger RNA
answer
copy
question
transfer RNA
answer
translator
question
ribosomal RNA
answer
assembles
question
Adenosine Triphosphate (ATP
answer
adenine containing rNA nucleotide with two additional phosphate groups; higher energy derived from carbohydrates
question
function of ATP
answer
phosphorylation: terminal phosphates are enzymtically transferred to and energize other molecules