Which two of the following are components of the human holobiont?

a. Candida yeast
b. ringworms
c. rabies virus
d. the human body


a. Candida yeast
d. the human body

Biology & Microbiology

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Microorganisms use hydrogen bonds to attach themselves to the surfaces that they live upon. Many of them lose hold of the surface because of the weak nature of these bonds and end up dying or being washed away

Why don't microbes just use covalent bonds instead? A. Covalent bonds are always permanent bonds; the microbes could never get OFF their surface if they used them. B. Covalent bonds depend on completely giving up or completely accepting an electron to form the bond. This isn't possible for many microbes without dramatically altering their basic molecular composition. C. Covalent bonds typically require enzymes to form/break, whereas hydrogen bonds don't. If covalent bonds were used, it would require much more energy and molecules to be contributed from the cell. Hydrogen bonds don't have these requirements. D. Covalent bonds may have more specific and stringent requirements for what atoms can bond with. This makes for stronger bonds, but also decreases the overall potential for bonds that could readily be created between the microbe and its desired surface. E. C and D

Biology & Microbiology

Why is it that two different plasmids may be considered incompatible?

What will be an ideal response?

Biology & Microbiology

Trypanosoma and Leshmania species are transmitted by

A) direct person-to-person contact. B) insect vectors. C) contaminated food or water. D) contaminated needles and syringes.

Biology & Microbiology

Where in a prokaryotic cell is the genetic material found?

a. Nucleoid b. Nucleus c. Histones  d. Nucleosome

Biology & Microbiology