Biology-Unit 2-Quiz 4
polymers
Small units of carbon compounds can be put together in repeated combination to form very large molecules. These large molecules are called _______ and the process of putting them together is called polymerization
adenine, thymine, cytosine, and guanine.
The four different bases in DNA are:
polymers
The four major divisions of biological organic substances carbohydrates, lipids, proteins, and nucleic acids are ________
a sugar, a phosphate group and a base
The molecule of DNA is a double chain polymer of three basic parts:
hydrogen, oxygen, and nitrogen
The most common elements that bond with carbon are:
Phosphilids
The organic chemicals which help cell walls to conserve internal fluids are _____.
hemoglobin
The oxygen-transporting protein in the blood is called:
sources of energy
Therefore, carbon compounds can serve as ___________ because energy is liberated from carbon molecules when the bonds are broken.
are usually ions of the original elements
When compounds which are formed from ionic bonds decompose, the products:
-adding together the reactant building blocks -removing water from them -forming covalent bonds between them
When the biological system builds up a polymer, it does so by:
antibodies, enzymes, hormones
Which of the following chemicals are proteins?
carbohydrate polymers formed
Which statement represents dehydration synthesis?
amino acids
_______ are the building blocks of proteins
Starch
_______ is an example of a complex sugar.
RNA
_______ molecules carry out the special instructions coded in the DNA for the manufacture (synthesis) of proteins
Proteins
_______ play vital functional roles as enzymes, antibodies, certain hormones, and oxygen carriers for cells and tissues.
Carbon, hydrogen, oxygen
_______, ________, ________ are the elements found in carbohydrates
Ionic
________ compounds, on the other hand, are not good sources of energy because they decompose into ions which form new ionic bonds as soon as the molecules are broken
DNA
________ is located in the nucleus of the cell while RNA can be located in the nucleus but also is found outside the nucleus in the cytoplasm.
Fats
________ stored in the body are the most highly concentrated source of energy. In fact, they provide twice as many calories (a measure of energy) as does the same mass of carbohydrates or proteins
Phospholipids
__________ are one of the major constituents of the cell membrane.
steroids
___________ are a complex arrangement of carbon atoms into four-ring structures. They include cholesterol, which is a component of cell membranes
Phospholipids
____________ are similar to fats in that they usually contain glycerol and fatty acids (two rather than three as do fats). They additionally contain a phosphate group.
DNA
(or deoxyribonucleic acid) A complex molecule containing the genetic code.
RNA
(or ribonucleic acid) A nucleic acid which participates in the synthesis of proteins.
lipid
A group of organic compounds including fats, steroids, and phospholipids.
protein
A large complex organic molecule consisting of a large number of amino acids linked together by peptide bonds
polysaccharide
A polymer of simple sugars (monosaccharides).
antibody
A protein specialized to defend the body against disease
polymerization
A reaction in which two or more molecules unite, forming a more complex molecule
starch
a polymer of glucose units
RNA
an acid located in the cell nucleus
nucleic acid
A sequence of sugars, phosphates and nitrogenous organic bases: DNA and RNA
glucose
A simple sugar (C6H12O6) occurring in plant and animal tissues
Carbohydrate
A sugar or polymer of sugar; contains the elements carbon, hydrogen, and oxygen
carbohydrate
A sugar or polymer of sugar; contains the elements carbon, hydrogen, and oxygen.
Disaccharide
A two-sugar polymer
- it can form very large molecules by bonding with other carbon atoms to form molecules of various shapes and sizes -carbon bonding is almost entirely covalent. This property enables decomposition of molecules to occur readily.
Carbon has properties that give it particular importance to life:
four
Carbon must form _______ covalent bonds to complete its outermost energy level
DNA
Carrying the genetic code and determining an organism's structure and function are the functions of:
sulfur and phosphorus
Chemically, proteins always contain carbon, hydrogen, oxygen, and nitrogen. Many proteins also contain:
steroids, phospholipids, fats
Choose from the following list the three groups of lipids:
synthesis
Fats are products of ________ reactions
glycerol and fatty acids
Fats have two basic components (they are a product of synthesis reactions:
-They are not soluble in water -the H/O ratio is different
How do lipids differ from carbohydrates?
RNA is usually single-stranded The sugar in RNA is ribose, and the base uracil substitutes for thymine.
How does RNA differ from DNA?
nitrogen
In addition to the elements found in carbohydrates and lipids, proteins contain the element __________
hydrolysis
Just as these large molecules were synthesized from smaller molecules, they can be decomposed back into smaller molecules. In the breaking of the covalent bond, water is added and energy is liberated. This type of reaction is called:
carbohydrates polymers proteins nucleic acids
Large organic molecules which are synthesized from multiple identical subunits are:
do not
Lipid compounds ______ resemble each other structurally.
organic solvents
Lipids are soluble in solvents called:
False
Many elements bond to carbon by exchanging electrons t/f
silk, cotton, wood and natural rubber,
Many naturally occurring substances, such as _______, ______, ______, and _______ are polymers
twenty
More than _______ different amino acids occur in nature
little
Nucleic acids contribute ______ to the mass of the cell. However, they are the largest and most specialized molecules in living organisms.
deoxyribonucleic acids (DNA) and ribonucleic acids (RNA).
Nucleic acids exist in two forms:
carbohydrates
Organic compounds consisting of various compounds of sugar are generally called:
phosphorus, sulfur, metals, and halogens
Other elements such as ______, _______, ______, and ________ (fluorine and chlorine) also frequently bond with carbon.
meat, milk, fish, eggs, cheese, and some beans.
Proteins are derived from:
protein fats nucleic acids carbohydrates
(Select all that apply.) The four organic molecules common to organisms are _____.
C(H2O)
. Hydrogen (H) is present in twice the amount of carbon (C) or oxygen (O). The basic formula is ________
dehydration synthesis
A bonding of subunits to form a polymer with the loss of water
polymer
A chemical compound in which each molecule is made up of two or more simpler molecules strung together.
hormone
A chemical synthesized by an organism which aids in the control of a specific function in the organism.
carbohydrate
C6H12O6 is a type of:
readily available
Carbohydrates are not the only source of energy, but they are the most ____________ source of chemical energy and are used by many cells in preference to other energy sources
blue
Starch will turn a drop of the iodine from red-brown to _____
amino acids; protein
Sugars combine with _______ and ______ to form important compounds that hold cells together
polymer
The "uprights" of the ladder are repeating units of a sugar molecule called deoxyribose and a phosphate group and these are linked to one another to form a ________, often called sugar-phosphate backbone
DNA
The _______ molecule has genetic information contained within its structure
adenine always pairs with thymine and guanine with cytosine
The bases forming the rungs are always found in paired sets:
amino acid
The basic building block of proteins; contains a carboxyl group (-COOH) and an amino group (-NH2).
peptide bonds
The bonds between amino acids are called:.
hydrolysis
The breakdown of large molecules into smaller molecules with water being a reactant.
glucose
The common name for C6H12O6 is _____.
polysaccharides
The complex sugars are generally called .
Monosaccharide
the building block, or monomer, of a carbohydrate
carbon
the chemistry of life is centered on the chemistry of the element __________
