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Genetics
Science
Question | Answer |
---|---|
Put the following in order from largest to smallest: Gene, DNA, cell, nucleus, chromosome. | Cell, nucleus, chromosomes, DNA, genes. |
The result of activated genes. | Genetic expression. |
The way that an unseen gene is seen in an organism as an actual physical trait. | Expressed. |
True or False: All cells in a person's body have identical DNA. | True. |
True or False: A cell uses all of the genetic information it contains. | False, it only uses some of its genetic information, or what is necessary to operate the cell's function. |
How does differentiation occur? | Only some genes in a cell are activated and used. |
True or False: The environment can affect the way genes are expressed. | True. |
The separation of pairs of homologous chromosomes that occurs during meiosis so that only one chromosome from each pair is present in any single gamete. | Segregation. |
The process or act of exchanging genes between chromosomes, resulting in a different genetic combination and ultimately to the formation of unique gametes with chromosomes that are different from those of its parents. | Recombination. |
One member of a pair of genes occupying a specific spot on a chromosome that controls the same trait. | Alleles. |
Genetic material in the chromosome. | DNA. |
What is the structure of DNA? | A polymer of repeating nucleotides. |
A basic unit of DNA . | Nucleotide. |
What are nucleotides composed of? | A phosphate group, five carbon sugar, nitrogenous base. |
What sugar does DNA contain? | Deoxiribose. |
Base pairing rule for DNA. | A and T, G and C. |
Describe the Watson and Crick Model. | Two chains of nucleotides in a ladder- like structure. |
What are the sides of DNA composed of? | Phosphates and sugars. |
What is attached to each sugar molecule? | Nitrogenous base. |
How are bases attached together? | Weak hydrogen bonds. |
What shape is DNA in? | Double helix. |
Steps for DNA replication. | 1 . The hydrogen bonds break and the double stranded DNA unzips. 2. Free nucleotides attach themselves to the hydrogen bonds. 3. Two identical forms of DNA are now formed. |
Where does DNA replication occur? | Nucleus. |
RNA is ____________ stranded. | Single. |
Function of RNA. | Make proteins. |
Structure of RNA. | Phosphate group, five carbon sugar, base. |
What is the sugar for RNA? | Ribose. |
Look at diagram for DNA/RNA. | :D |
What base does RNA not have that DNA does, and what base replaces it? | T, U. |
Where is RNA found? | Nucleus, cytoplasm, and ribosomes. |
Where is DNA found? | Nucleus. |
How many types of DNA are there? | One. |
Types of RNA. | mRNA, rRNA, and tRNA. |
Carries the hereditary information for protein synthesis from the nucleus to the cytoplasm. | Messenger RNA. |
Carries an amino acid to the mRNA in protein synthesis, made of amino acids and anticodon. | Transfer RNA. |
Type of RNA that is found in ribosomes. | rRNA. |
Look at practice questions. | :D |
A group of three bases in a mRNA sequence that specifies a particular amino acid. | Triplet code/Codon. |
A sequence of three bases on tRNA that is complimentary to a mRNA codon and specifies the amino acid that the tRNA. | Anticodon. |
The copying of a genetic message into a molecule of mRNA. | Transcription. |
Where does transcription occur? | In the nucleus. |
What happens during transcription? | The DNA unzips along the weak hydrogen bonds, free RNA nucleotides copy genetic hereditary information, synthesizing mRNA. |
The process by which the information coded in RNA is used for the assembly of a particular amino acid sequence. | Translation. |
Where does translation occur? | In the ribosome. |
What happens during translation? | Message gets read and interpreted into a polypeptide chain. |
The hypothesis that states that every gene directs the synthesis of a particular polypeptide chain. | One gene one polypeptide hypothesis. |
Steps of protein synthesis. | 1. DNA serves as a template for mRNA 2. mRNA copies the DNA (transcription) 3. mRNA transfers the code from the nucleus to the ribosome 4. tRNA molecules bring the amino acids to the ribosomes |
Steps of protein synthesis. (Part 2) | 5. tRNA attaches to mRNA and a chain of amino acids forms with a specific shape sequence 6. Proteins detach from the RNA, RNA gets recycled |
What determines the function of the protein formed? | The shape of the protein. |