_____Which of the following inhibits bacterial growth but does not kill bacteria
ID: 98426 • Letter: #
Question
_____Which of the following inhibits bacterial growth but does not kill bacteria a) Lysozyme b) Bactericidal agent c) Bacteriostatic agent d) Antiseptic agent ____The prevention of infection caused by microorganisms is called a) disinfection b)antisepsis c) sterilization d) sanitization ____ When a microorganism is placed in a(n)_____ solution, water will enter into the cell and cause it to burst unless something is done to prevent this: a)hypotonic b)isotonic c) hypertonic d) osmotonic _____In a DNA molecule, which base would you expect to find paired with cytosine? a)uracil b) adenine c)guanine d) thymine c) cytosine ___ DNA serves as the template to initiate protein synthesis. What is directly formed from this template? a) protein b)mRNA c)tRNA d)rRNA e)ATP ____ What does ligase do during replication of DNA? a) Makes copies of mRNA from DNA b) Removes damaged sections of DNA c) Joins together mRNA d) Joins together DNA segments e) Digests mRNA when it is no longer needed _____ Which is mismatched? a) Replication = formation of 2 identical DNA molecules b)Transcription = mRNA synthesized from a DNA template c) Translation = tRNA transfers amino acids to the ribosomes based on mRNA codons d) Nonsense codons = terminator codons e) Anticodon = sequence of 3 nitrogenous bases on the gene ____Which of the following can be used to estimate the number of microorganisms in a culture? a) Direct counts of microbial cells b) Counts of viable cells using colony growth procedures c) Measurements of microbial biomass d)All of the choices. _____In a continuous culture system, the rate at which media is added and removed is called the rate a) dilution b)chemostatic c) pass-through d) flow-through ____ Organisms that do not require oxygen for growth but grow better in its presence are called____a)facultative anaerobes b) microaerophiles c) aerotolerant d)anoxygenic. _______ Organisms that ignore oxy gen and grow equally well in its presence or absence are called a) facultative anaerobes b) microacrophiles c)acrotolerant d) anoxygenic ____ Which of the following influence(s) the efficiency of an antimicrobial agent? a)concentration of agent b)duration of exposure c) temperature d) all of themExplanation / Answer
The answers are
1. c. bacteriostatic agent
2. b. antispesis
3. a. hypotonic - low concentration solution
4. c. guanine. A binds with T, C binds with G.
5. b. mRNA. Actually the first RNA synthesized from DNA is called hnRNA, later it undergoes post transcriptional modifications to from mRNA
6. d. joins together DNA segment. DNA ligage plays a crucial role in lagging strand formation.
7. e. Anticodon - sequence of 3 nitrogen bases. Anticodon means the three beses on the tRNA anticodon arm
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