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Like proteins and carbohydrates, nucleic acids are ___
polymers
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Each nucleotide has three
parts:
nitrogenous base, phosphate group, a five-membered cyclic monosaccharide
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they are cyclic compounds with at least one
nitrogen atom in the ring structure
heterocyclic amines
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The five-carbon sugar in RNA is
ribose
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the sugar in DNA is
2’-deoxyribose
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A molecule composed of either ribose or deoxyribose and one of the five nitrogenous bases
found in DNA and/or RNA is called a
nucleoside
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There are two types of nitrogenous bases:
purines and pyrimidines
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Purines
Adenine and Guanine
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Pyramidine
Cytosine, Thymine and Uracil
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are the building blocks of nucleic acids; they are the monomers of the DNA and RNA
polymers
Nucleotides
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A nucleotide with the sugar ribose is a
ribonucleotide
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a nucleotide having the sugar 2’-deoxyribose is a
deoxyribonucleotide
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The covalent bond between the sugar and the phosphoryl group is a
phosphoester bond
-
plays an essential role as a source of
biochemical energy, which is released during its conversion to adenosine diphosphate (ADP).
Adenosine triphosphate (ATP)
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A single strand of DNA is a polymer of nucleotides bonded to one another b___
- 3’-5’ phosphodiester
- bonds
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One noncovalent attraction that helps maintain the double helix structure is ______
- hydrogen bonding
- between the nitrogenous bases in the center of the helix
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are pieces of DNA that carry the genetic instructions, or genes, of an organism
Chromosome
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The complete set of genetic information in all the chromosomes of an organism is called the
genome
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are organisms with a simple cellular structure in which there is no true nucleus
surrounded by a nuclear membrane and there are no true membrane bound organelles
Prokaryote
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are organisms that have cells containing a true nucleus enclosed by a nuclear
membrane
Eukaryotes
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Adder’s Tongue fern have ___ chromosomes
631
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The first level of structure of a chromosome is the
Nucleosome
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Incubation of DNA at pH3
causes selective removal of the purine bases, resulting in a derivative called
apurinic acid
-
The higher the G + C content of a DNA molecule,
the higher the melting temperature
-
-Discovered by Watson and Crick, is right-handed (natural DNA) and consists of 10 bps per
turn of the helix.
- most stable dna structure
B-DNA
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This form is favored in many solutions that are relatively devoid of water or when DNA is
partially dehydrated. The DNA is still arranged in a right-handed double helix, but the helix is
wider and the number of base pairs per helical turn is 11
A-DNA
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his form is a more radical departure from the B structure; the most obvious distinction is
the left-handed helical rotation. There are 12 base pairs per helical turn
Z-DNA
-
is a word, phrase, or
sentence that is spelled identically read either forward or backward;
A palindrome
-
When the inverted repeat occurs within each individual strand of the DNA, sequence is
called a
mirror repeat
-
When only a single DNA (or RNA) strand is involved, the structure is called
a hairpin
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When both strands of a duplex DNA are involved, it is called a
cruciform
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As the DNA is heated and the strands separate, the wavelength of absorption does not change, but the
amount of light absorbed increases This effect is called
Hyperchromicity
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