How do you know the computer you are working on is not alive?
What will be an ideal response?
It is not made of cells.
It does not maintain an internal consistency of water, solutes, and other components.
It cannot reproduce, asexually or sexually.
It cannot evolve.
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The rDNA cluster is transcribed in a special region of the nucleus. What is this structure called and what is its morphology?
What will be an ideal response?
A physician sends a stool sample to your lab, and wants to know if there are lactose fermenting microbes in the sample. How might you determine if these microbes are present or not from this mixed-microbe specimen?
A. Streak the sample for isolation on Thayer-Martin agar (which contains lactose and particular antibiotics for selectivity). B. Streak the sample for isolation on a blood agar plate (which contains lactose AND red blood cells that enrich the culture for iron). C. Streak the sample for isolation on a MacConkey agar plate (which contains lactose and a pH indicator that turns pink when acid byproducts are present). D. None of the above would work-there's no way to reliably determine this feature from the specimen given.
Which of the following bacterial hosts should be used to avoid degradation of DNA that is introduced via a cloning vector?
A. Saccharomyces cerevisiae wild type cells B. RecA-expressing Escherchia coli C. Escherchia coli RecA mutants D. Escherichia coli that lack endonucleases
Labeling.The following statements refer to the accompanying figure showing the fine structure of a leaf
Figure 27.12A
A. Epidermis is labeled ____. B. Cells rich in chlorophyll and thus the main sites of photosynthesis are in layers labeled ____. C. The spongy mesophyll is labeled ____.