Janines Bio Flashcards
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- What amino acid is represented by the RNA codon UUU?
- Phenylalanine
- How many amino acids make up protein?
- 20
- What are nucleotides composed of?
- Ribose sugar, phosphate and a nitrogen base.
- What is Semiconservative replication?
- The process in which the original strands of DNA remain intact and act as templates for the synthesis of duplicate strands of DNA.
- What kind of environmental factors can cause uncomplementary notrogen bases to become paired?
- Hazardous chemicals and radiation.
- What contains nitrogen and can be linked together to form proteins?
- Amino acids
- An _____ is a catalyst that speeds up the rate of _______ reactions.
- An enzyme is a catalyst that speeds up the rate of metabolic reactions.
- Approximately how many genes does each human chromosome contain?
- 10 000
- RNA has no thymine, what other nitrogen base works in its place?
- Uracil
- Once the protein molecule has been built and the process of translation is complete, what turns the synthesis off?
- A terminator codon turns synthesis off.
- What can cause changes in DNA? and give some examples.
- Mutagenic agents like cosmic rays, X rays, ultraviolet radiation, and chemicals.
- Why are mutagenic agents particularly dangerous for pregnant women?
- Because a mutation in the baby would be coded into the DNA of every succeeding cell of the body and be repeated billions of times.
- Since we have oncogenes in our normal cells, why dont we all have cancer?
- These cancer causing genes are harmless when they are near their regulator genes and kept under control.
- What form of biological weaponry was developed for World War II by North America and England?
- They researched and tested the deadly anthrax bacteriem, which affects both cattle and humans.
- What does the principle of segregation state?
- in Meiosis, two alleles separate so that each gamete receives only one form of the gene.