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Why was the cold ethanol added to the soap and salt mixture?
A To digest the cell walls
B To dissolve the RNA
C To emulsify lipids and remove large cellular debris
D To precipitate the DNA
E To denature the cytoplasmic proteins
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- A chromosome contains many different gene regions that are transcribed into different ________. a. proteins c. RNAs b. polypeptides d. DNA strandsIn order to isolate the DNA or RNA from the cells, what would be the first step? a. to block the mucleus from digesting the nucleic acid b.To precipiate the nucleic acid c. To break down the plasma membrane and the cell walls (plant cells) d.To remove protiens from the solutionsWhich is true of Prokaryote cells? A) Because their DNA exists in a nucleoid area, the synthesis of proteins depends on random interactions between mRNA and rRNA, B) They contain membrane-bounded compartments or organelles. C) A true nucleus contains the DNA in the form of chromosomes D) Some contain mitochondria E) They contain many organelles in the cytoplasm
- Which statement is true of reverse transcriptase? a. It is a nucleic acid. b. It infects cells. c. It transcribes RNA to make DNA. d. It is a lipid.Choose the combination of answers that most accurately completes the statement. Transfer RNA is the molecule that a. contributes to the structure of ribosomes b. adapts the genetic code to protein structure c. transfers the DNA code to mRNA d. provides the master code for amino acidsWhat is the first step in protein synthesis? A. making an RNA copy of the DNA within the nucleus B. making a sequence of amino acids C. forming peptide bonds between amino acids D. making a copy of RNA with DNA outside the nucleus
- Which is not true of RNA? a. It is usually single-stranded. b. It functions in the cytoplasm. c. It contains uracil. d. It contains ribose. e. There are 4 functional types.Why are nucleotide or nucleoside analogs effective as drugs? a) act as competitive inhibitor b) mimic functions of DNA or RNA components c) targets the cell wallWhich is the dominant form of DNA found in the cell? H 2. Z 3. B 4. A
- In three sentence, how does ribosome relate to DNAHow does fluoroquinolone antibiotic drug treat infections? a. Blocking folic acid synthesis b. Blocking protein synthesis c. Inhibiting nucleic acid synthesis d. Weakening bacterial cell wallWhat is the role of Proteinase K in DNA isolation? A. Inhibit enzymes B Catalyze breakdown of nuclei acids C Degrade proteins D Remove disultide bongs in proteins