A researcher discovers a mutant carnation plant that lacks any A-class homeotic genes. Which of the following structures would be malformed (or absent) in this mutant? Select all correct choices
A. stamens
B. carpels
C. petals
D. sepals
C,D
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The initiation of transcription in eukaryotes almost always requires activator proteins because:
A. RNA polymerases have little to no intrinsic affinity for promoter sequences. B. RNA polymerases cannot synthesize RNA polymers without association with coactivators. C. promoter sequences are almost always bound by repressor proteins. D. eukaryotic genes exhibit very low gene density.
The common cold is typically caused by a(n)
a. enterovirus. b. retrovirus. c. picornavirus. d. rhinovirus. e. adenovirus.
Lateral meristems
a. are groups of dividing cells. b. are responsible for increases in the width of a stem or root. c. are also called cambia. d. produce secondary growth only. e. include all of these characteristics
Selective toxicity should be avoided when developing a new antimicrobial drug.
Answer the following statement true (T) or false (F)