22. A regulatory protein that binds to specific sites on DNA and blocks A) Intro

Question

22. A regulatory protein that binds to specific sites on DNA and blocks A) Intron B) Activator C) Operorn D) Repressor 23. An operon is a beneficial genetic element because it A) translates the DNA sequence into amino acids B) allows the expression of multiple related genes in prokaryotes C) allows the expression of multiple related genes in eukaryotes D) inhibits the expression of multiple related genes in prokaryotes 24. Which of the following is an example of a biofilm? A) Dental plaque B) Soap scum C) Marine diatom D) Planktonic microcolony 25. Common nutrients required by microorganisms are: Al trace metals B) vitamin C C) helium D) carbon, oxygen, nitrogen 26. What is the biological function of endospores? A) They are bacterial reproductive structures B) They enable organisms to endure extremes of temperature, drying, and nutrient depletion. C) They transport toxins. D) Endospores can serve as reproductive structures, enable survival in harsh environments, and transport toxins. Match the following terms (27-32) with their respective meanings (A-F). If you choose F, leave blank 27) fermentation A. an organism that requires organic carbon as its carbon source B. an organism that can grow with carbon as sole source of CO2 C. oxidative phosphorylation D. substrate-level phosphorylation E. an organism that obtains energy from oxidation of inorganic compounds F. an organism that obtains energy from light 28) respiration 29 autotroph 30) chemolithotroph 1) heterotroph 2) phototroph The transfer of genes from one prokaryotic cell to another by a mechanism involving cell-cell contact meiosis onjugation udding mitosis

Explanation / Answer

Q23) An operon is a useful genetic element, because it:

ANSWER: B) allows expression of multiple related genes in prokaryotes.

Q24) Example of biofilm is:-

answer:- a) dental plaque

Q25) common nutritional requirements of microorganisms:-

Answer: d) carbon, oxygen, nitrogen

Q26)  the biological function of endospores is:-

Answer:- b) They enable organisms to endure extremes of temperature, drying, and nutrient depletion.

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