There are bacteria that live on single-celled eukaryotes
A. true
B. false
A
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Match the following items with the correct phrases.
_______1. In the nitrogen cycle, bacteria called ____________________ convert atmospheric nitrogen gas into ammonia in the soil. _______2. ____________________ live in the root nodules of legumes such as alfalfa and clover. _______3. ____________________ are capable of converting the nitrogen within a dead plant or animal into ammonia in the soil. _______4. In the nitrogen cycle, soil organisms called ____________________ convert ammonia into nitrites, and nitrites into nitrates. _______5. In the nitrogen cycle, soil organisms called ____________________ convert the nitrogen in nitrates to nitrogen gas in the atmosphere. a. cyanobacteria b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. saprophytes
Small circular, extrachromosomal DNA segments are known as ________.
A. clones B. vectors C. plasmids D. RNA
HIV selectively destroys CD4 cells and as a result, a person with AIDS is susceptible to life-threatening viral infections. Knowing this, you can conclude that __________.
A) regulatory T cells are killed by the virus B) these viruses have T-dependent antigens C) B cells do not recognize viral antigens D) CD4 T cells need help from B cells to recognize viral antigens
Assume that you have cut ? DNA with the restriction enzyme HindIII. You separate the fragments on an agarose gel and stain the DNA with ethidium bromide. You notice that the intensity of the stain is less in the bands that have migrated closer to the
"+" pole. Give an explanation for this finding. What will be an ideal response?