The rabies virus is transmitted to humans by
A. contamination of scratches with saliva from an infected animal.
B. the bite of an infected animal.
C. aerosols of the virus that can be present in caves where bats roost.
D. All of the choices are correct.
Answer: D
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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
Muscle and liver cells in animals store sugar primarily in the form of ________
a. glycogen b. starch c. cellulose d. chitin
Which of the following is a major function of the ovaries?
A. They manufacture the sex hormones, estrogen and progesterone. B. They comprise the canal through which babies are delivered. C. They are the organs directly responsible for a woman's orgasm. D. They hold and nourish the developing fetus.
Organisms with a nucleus are known as: