In which situation might methylation of membrane proteins in Escherichia coli initiate a phosphorelay system that evokes clockwise rotation of flagella?
A. Utilization of lactose due during diauxic growth
B. Presence of a chemorepellent in the extracellular environment
C. Change in environmental osmotic pressure
D. Cellular population reaches a quorum
Answer: B
You might also like to view...
Which statement accurately describes the relationship between RNA interference, small interfering
RNA, and micro RNAs?
a. They all describe different methods of post-translational gene regulation. b. Micro RNAs can be broken down into two types: RNA interference molecules and small interfering RNAs. c. RNA interference occurs in two ways: by micro RNA or by small interfering RNAs. d. Small interfering RNAs bind to dicer protein, microRNAs do not; both are types of RNA interference. e. MicroRNAs are transcribed from viruses, small interfering RNAs are transcribed from nuclear DNA; both are types of RNA interference.
What term is used to indicate a characteristic that is shared and inherited from a common ancestor?
a. homologous trait b. analogous trait c. cladistic trait d. ancestral trait e. derived trait
The end product of transcription is the production of a(n) ________
Fill in the blank(s) with correct word
Which of the following conditions is likely to decrease the likelihood of skeletal muscle contraction?
(a) partial depolarization of the T-tubule membrane, such that the resting potential is closer to zero (b) addition of a drug that blocks Ca2+ binding to troponin (c) an increase in the amount of ATP in the cell (d) a mutation in tropomyosin that decreases its affinity for the actin filament