Which substances speed up or halt transcription?
a. RNA polymerases
b. DNA polymerases
c. introns
d. regulatory proteins
e. exons
D
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Type II survivorship curves ____
a. are characteristics of humans and elephants b. typify a population in which all ages have an equal chance of survival c. indicate a high mortality rate in the very young d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age
e. are typical of annual plantsWhich cell type is responsible for a major component of tissue rejection following an organ transplant?
a. B cells b. plasma cells c. memory cells d. T helper cells e. cytotoxic T cells
Pseudomonas is an enteric gram-negative rod.
a. true b. false
In the E-test, the zone of inhibition is elliptical around the plastic strips impregnated with antibiotics. What information do you get when you know the point at which the bacterial growth touches the strip?
A) You know the concentration of a chemical that bacteria are resistant to. B) You know the concentration of a chemical that slightly diminishes microbial growth. C) You know the concentration of a chemical that completely inhibits microbial growth