Biology- Chapter 10 Flashcards
Molecular Biology
The study of heredity at the molecular level
Nucleotides
Both DNA and RNA are nucleic acids, which consist of long chains ( polymers) of chemical units (monomers) called this.
Polynucleotides
Can be very long and may have any sequence of the four different types of nucleotides ( A, C, T, AND G)
Sugar - Phosphate Backbone
The result of repeating pattern of sugar phosphate sugar phosphate, which is known as this. When nucleotides are joined together by covalent bonds between the sugar of one nucleotide and the phosphate of the next.
DNA
DeoxyriboNucleic Acid , with nucleic referring to DNA’s location in the nuclei of eukaryotic cells.
The bases of DNA can be divided into two types:
Thymine (T) and Cytosine (C) : single-ring structures
Adenine (A) and Guanine (G) : are larger, double-ring structures.
RNA contains what instead of Thymine?
It contains Uracil (U), and the R in RNA stands for Ribose
Compare and Contrast the chemical components of DNA and RNA.
Both are polymers of nucleotides ( a sugar + a nitrogenous base + a phosphate group ). In RNA, the sugar is ribose; in DNA, it is deoxyribose. Both RNA and DNA, have the bases A, G, and C, but DNA has T and RNA has U.
Double Helix
The thickness of the helix suggested that it was made up of two polynucleotide strands.
How does complementary base pairing make DNA replication possible ?
When the two strands of the double helix separate, each serves as a template on which nucleotides can be arranged by specific base pairing into new complementary strands.
What enzymes connect nucleotides together during DNA replication?
DNA polymerases
DNA Polymerases
The enzymes that make the covalent bonds between the nucleotides of a new DNA strand.
What are transcription and translation ?
Transcription is the transfer of genetic information from DNA to RNA. Translation is the use of the information in an RNA molecule for the synthesis of a polypeptide.
How many Nucleotides are necessary to code for a polypeptide that is 100 amino acids long?
300
Codons
The genetic instructions for the amino acid sequence of a polypeptide chain are written in DNA and RNA as a series of three-base words.
Transcription
The transfer of genetic information from DNA into an RNA molecule
Translation
the transfer of the information from RNA into a polypeptide
Genetic Code
Is the set of rules that convert a nucleotide sequence in RNA to an amino acid sequence.
RNA Polymerase
RNA nucleotides are linked by the transcription enzyme that is called this.
Terminator
In the third phase, termination, the RNA polymerase reaches a special sequence of bases in the DNA template called this.This signals the end of the gene.
How does RNA polymerase “know” where to start transcribing a gene?
It recognizes the gene’s promoter, a specific nucleotide sequence.