What are tree rings? How can they be used to map changes in weather?
What will be an ideal response?
Tree rings represent seasonal growth of xylem in temperate regions. In spring, when rain is plentiful, vascular cambium produces large xylem cells with thin walls. In drier summers, they produce smaller cells with thicker walls. Each alternating band of spring and summer growth is a tree ring. The width of annual tree rings can be used as an indicator of past weather patterns.
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Match the following items with the correct phrases.
_______1. Semisynthetic penicillins that are known as penicillinase-resistant penicillins. _______2. Examples of antibiotics that inhibit cell wall synthesis. _______3. Semisynthetic penicillins that are not resistant to penicillinase. _______4. Examples of antibiotics that inhibit protein synthesis. _______5. Examples of antibiotics produced by molds. a. penicillin, bacitracin, cephalosporins, vancomycin b. ampicillin and carbenicillin c. methicillin, oxacillin, cloxacillin, nafcillin d. tetracycline, chloramphenicol, erythromycin, streptomycin e. penicillin and cephalosporins, but not bacitracin and vancomycin
Phages that can either replicate and cause cell lysis or can integrate their DNA into the host DNA are called
A. lysogenic phages. B. lytic phages. C. virulent phages. D. segmented phages.
An infection that develops while being treated at a hospital or medical facility is called a(n)_____ infection
Fill in the blank(s) with the appropriate word(s).
Identify the bacterial shape pictured: O
A) coccus B) pleomorph C) spirochete D) bacillus