Microbiology: 1. The following are ways that bacteria can exchange genetic infor

Question

Microbiology:

1. The following are ways that bacteria can exchange genetic information

   a) Conjuation

   b) Transoposons

   c) Transformation

   d) All of the above

2. The following is true about bacterial DNA

   a) It is double stranded and is circular without histone proteins

   b) It is double stranded, is found in nuceloid and usually has less than 10,000 genes

   c) It is usually double stranded, does not usually have histones and is found in the nucleoid

   d) It is single stranded and does not have histone proteins

3. The best medium for growing just gram positive bacteria would be

   a) Sabauroud’s

   b) EMB

   c) Mackonkey’s agar

   d) PEA

4. Retroviruses may have at some time the following:

   a) DNA, envelopes, reverse transcriptase, proteases, RNA

   b) Capsids, RNA, DNA, topioisomerases, glycoprotein spikes

   c) genetic material, envelopes, capsids, reverse transcriptase

   d) All of the above

Explanation / Answer

Bacteria can exchange genetic material by (d) all of the above i.e conjugation, transposons and transformation. (a) bacterial DNA is double stranded and circular and without histones proteins Best medium to grow gram positive bacteria would be (d) PEA, Phenylethyl alcohol agar. PEA agar is a selective medium for the isolation of gram-positive organisms. Retroviruses may have at some time (d) all of the above.

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