Answer the following statements true (T) or false (F)
1. No microorganisms are able to live in the stomach because of the extremely low pH of the stomach contents.
2. Microbial communities known as biofilms are interesting, but they have no medical significance.
3. Microorganisms are unable to live in the colon owing to the lack of oxygen there.
4. Some of the bacteria used in bioremediation are naturally occurring, but others have been genetically engineered.
5. Many of the members of our indigenous microflora have the potential to cause disease.
1. FALSE
2. FALSE
3. FALSE
4. TRUE
5. TRUE
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Carbon atoms are the most versatile building blocks of the molecules used by living organisms because _____.
Fill in the blank(s) with correct word
Transduction often involves defective virus
Indicate whether this statement is true or false.
You grow a culture of bacteria and split it into two culture tubes. One sample of bacteria you treat with calcium and the other is not treated. When you transform both samples with a plasmid, only the samples treated with calcium take up the plasmid. Which of the following best explains your results?
A. DNA is degraded in the absence of calcium. B. Calcium precipitates DNA, preventing it from being taken up by cells. C. The bacteria require calcium to grow. D. The calcium makes the bacterial membrane more porous to DNA. E. The bacteria use calcium as a source of energy to take up the DNA.
Which of the following is characteristic of prokaryotic genomes but NOT eukaryotic genomes?
A) histones B) circular chromosomes C) linear chromosomes D) enclosed in a nuclear membrane E) typically consist of a few to several chromosomes