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78 terms

Bio Ch3

STUDY
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A carbon atom can form up to four covalent bonds
true
A carbon atom has six electrons in its outermost shell
False
The bond between a carbon and hydrogen atom is a polar bond
False
Oxygen and nitrogen have a stronger electronegativity than carbon (e.g., a strong pull on a shared electron
true
Bonds between carbon and other atoms are relatively unstable and readily dissociate, resulting in the formation of new molecules.
false
The carbon backbone of a molecule is made up of a string of carbon atoms held together with either single or double bonds
true
The carbon backbone of a molecule comes in a variety of shapes: linear, ring-like, or highly branched
true
Carbon is a relatively large atom allowing it to bind to more atoms than smaller atoms would, thereby making it more versatile
false
Functional groups help define the properties of macromolecules. The _____ functional group(s) is/are found within amino acids, while carbohydrates contain the _____ functional group(s).
amino & carboxyl // hydroxyl
Monomer of a protein
amino acid
Nucleic acid
nucleotide
lipid
fatty acid
Carbohydrate
monosacharrides
Glucose, fructose, c6h12o6
monosacharrides
sucrose, maltose, lactose, c12h22o11
disaccharide
cellulose, starch, glycogen
polysaccharide
no double bonds within carbon backbone, solid at room temperature, comes from animal and animal products
saturated fatty acid
liquid at room temp, oil,found in plants and plant products,double bonds within carbon backbone, transfat are a synthetic form that has a higher melting point
unsaturated fatty acid
Saturated fats are solid at room temperature
true
Saturated fats have a higher melting point than unsaturated fats
true
Saturated fats have one or more double bonds along the carbon backbone
false
Unsaturated fats are found primarily in animals and animal products
false
Unsaturated fats have kinks in the hydrogen-carbon chain and therefore the molecules do not lay flat
true
Trans fats are synthetic saturated fats
false
Trans fats have a higher melting point than natural unsaturated fats and a lower melting point than natural saturated fats
true
A gram of fat stores _____ energy than a gram of starch due to ______ within fat molecules relative to starch molecules
more // a higher proportion of C-H bonds
The plasma membrane is made up of a phospholipid bilayer, with the _____________ of the phospholipids_____________.
hydrophilic heads // sticking out toward the interior and exterior of the cell
If two proteins have the same complement of amino acids, what would increase the likelihood that the two proteins would behave differently, e.g., have different functions?
different sequence of the amino acids within the molecules
plays a role in protein synthesis
RNA polymerase
plays a role in muscle contraction / movement
myosin
protects again disease
antibodies
plays a role in digestion and metabolism
hexokinase & lactase
provides support and structure
actin and collagen
facilitates movement of molecules across plasma membranes
transporters
double stranded, housed within the nucleus of an animal cell, AT GC
DNA
single stranded, AU GC, ribose sugar within the backbone
RNA
DNA _______. RNA, on the other hand, ________.
provides the instructions for the specific sequence of amino acids used to build a protein // functions to convert a nucleotide sequence into an amino acid sequence
___ is a polysaccharide that is found primarily in plant cells as a form of energy storage. It is ___ ___ , and as a result is not very soluble in water.
Starch, moderately branched
____ is a polysaccharide primarily stored in muscle tissue. It is ___ _____ allowing hydroxyl side groups to be readily exposed to water in the surrounding tissue, for easy hydrolysis
Glycogen, highly branched
____ is _____ and most organisms lack the necessary enzyme to hydrolize the beta D glucose monomers. It is used primarily for ______ in plants
cellulose, unbranched, structural support
___ are the building blocks of protein. They are made up of a center carbon atom bound positively to a charged ___ group and a negatively charged ___ group and a side chain.
Amino acids, amino group, carboxyl group
____ formed by ______ reactions link amino acids together forming a linear chain.
polypeptides, dehydration
The ____ structure of a protein is the sequence of an amino acids that are attached together by a ____ bond.
primary structure, peptide
In the ____ structure of a protein the polypeptide is folded through the mechanisms of amino acids rotating around bonds folding into an a helix or a b pleated sheet structure and stablized by a ___ bond.
secondary, hydrogen
In the ___ structure of a protein the amino acid side chains of the folded polypeptide interact, forming a commplex _____ shape
tertiary, 3d (three deminsional)
The _____ structure of a protein exists if multiple polypeptides bind together to form a functional protein
quaternary
A person who sprints for 45 seconds obtains most of their energy from
muscle glycogen
What happens to the amount of muscle glycogen used for energy as exercise continues?
it decreases
After 3 hours of exercise what are the main sources of energy?
blood glucose and plasma free fatty acids
What happens to the amount of plasma free fatty acids used for energy as exercise continues?
they increase
Where are most plasma free fatty acids obtained from?
hydrolisis of stored fat
What type of bonds link individual amino acids together
peptide
The helix that forms in a protein chain as a result of hydrogen bonds and other weak forces is an example of
secondary structure
In the stable form of protein, what is generally oriented to the interior of the protein molecule?
hydrophobic portions
When an egg is fried, what happens to the protein in the egg?
protein is denatured
When forming a semi-solid gel such as gelatin, what type of molecule does the process of protein coagulation entrap?
water
The correct structure of DNA components can be presented as
phosphate-sugar-base
Which of the following is a characteristic of double-stranded DNA?
2 nanometers in width, 10 base pairs per turn, and 0.34 nanometers per basepair
Which of the following DNA molecules is the most stable?
GCGTGCAC
CGCACGTG
Doubled-stranded DNA consists of two antiparallel strands, meaning that one strand is oriented in the 5' to 3' direction, while the other is oriented in the 3' to 5' direction.
True
Asymmetrical spacing of the backbones of the DNA double helix generates major and minor grooves
True
Asymmetrical spacing of the backbones of the DNA double helix generates major and minor grooves
True
Molecules that contain the element ___ are considered organic molecules
carbon
____ was the first scientist to synthesize an organic molecule. The organic molecule synthesized was____
Wohler, urea
The versatility of carbon to serve as the bacbone for a variety of different molecules is due to
the ability of carbon atoms to form four covalent bonds, the ability of carbon to form covalent bonds with many different types of atoms
____ are molecules that hae the same molecular composition but differ to structure and or bonding association
isomers
___ is a storage of polysaccharides commonly found in the cells of animals
Glycogen
In contrast to other fatty acids, essential fatty acids
cannot be synthesized by the organism and are necessary for survival
Phospholipids ae amphipathic, which means they
are composed of a hydrophilic portion and a hydrophillic portion
The monomers of proteins are _____ and these are linked bhy polar covalent bonds commonly referred to as ____
amino acids, polypeptide
The ___ of a nucleotide determines where it is a component of dna or a component of RNA
five carbon sugar
A ___ is a portion of protein with a particular structure and function
domain
With regard to their binding to enzymes, why do enantiomers such as D- and L-glucose have different biological properties?
Enantiomers have different spatial relationships that are mirrors of each other. Therefore one may bind very tightly to an enzyme while the other one might not be recognized at all.
What type of reaction is the reverse of the ones shown here, in which a disaccharide is broken down into two monosaccharides?
the reverse of a dehydration reaction is called a hydrolysis reaction.
Certain types of fats used in baking are called shortenings. They are solid at room temperature. Shortenings are often made from vegetable oils by a process called hydrogenation. What do you think happens to the structure of an oil when it is hydrogenated?
changes them to a saturated fat, causing them to be solid at room temps
When water and oil are added to a test tube, the two liquids form two separate layers (think of oil and vinegar in a bottle of salad dressing). If a solution of phospholipids were added to a mixture of water and oil, where would the phospholipids dissolve?
polar regions would dissolve in the water and the nonpolar regions would dissolve in the oil
How many water molecules would be produced in making a polypeptide that is 72 amino acids long by dehydration reactions?
one less than the number of amino acid in the polypeptide
If the primary structure of Protein 1 in this figure were experimentally altered by the substitution of several incorrect amino acids for the correct ones, would Protein 1 still be able to interact with Protein 2?
no it would lose its fit and not be able to interact with the other protein