Podcast Beta
Questions and Answers
describe the components of DNA, and explain its functional relationship to RNA and protein.
DNA is made up of sugars and phosphate groups forming a double helix structure. Nitrogenous bases (adenine, thymine, cytosine, and guanine) are attached to the sugars. The two strands are held together by hydrogen bonds between the bases (A-T and C-G). The sequence of these bases carries information for making RNA and proteins in a cell.
Why are mutation and recombination important in the process of natural selection and the evolution of organisms?
Mutation and recombination provide genetic diversity. Environmental factors determine which organisms survive based on their traits. This survival process is called natural selection. Genetic diversity is crucial for some organisms to adapt and survive. Those that survive may undergo more changes, leading to the evolution of the specie
Compare and contrast:
- cDNA and gene
- RFLP and gene
- DNA probe and gene
- DNA polymerase and DNA ligase
- rDNA and cDNA
- genome and proteome
- Both are DNA 2. Both are DNA 3. Both are DNA 4. Both are enzymes 5. Both are DNA 6.The proteome is the expression of the genome.
What is the purpose of culture media?
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Why does the treatment of a wound with hydrogen peroxide result in bubbling?
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Which selective and differential medium is used to identify Staphylococcus aureus?
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E. coli was incubated with aeration in a nutrient medium containing two carbon sources, and the following growth curve was made from this culture. -E.coli is placed into one dish with different types of ingredients in that one dish -The graph shows the growth of the microbes a. Explain what happens at the time marked x. b. Which substrate provided “better” growth conditions for the bacteria? How can you tell?
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Clostridium and Streptococcus are both catalase-negative. Streptococcus grows by fermentation. Why is Clostridium killed by oxygen, whereas Streptococcus is not?
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Most laboratory media contain a fermentable carbohydrate and peptone because the majority of bacteria require carbon, nitrogen, and energy sources in these forms. How are these three needs met by glucose–minimal salts medium?
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Flask A contains yeast cells in glucose–minimal salts broth incubated at 30°C with aeration. Flask B contains yeast cells in glucose–minimal salts broth incubated at 30°C in an anaerobic jar. The yeasts are facultative anaerobes.
a. Which culture produced more ATP? b. Which culture produced more alcohol? c. Which culture had the shorter generation time? d. Which culture had the greater cell mass? e. Which culture had the higher absorbance?
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