A mineral deficiency is likely to affect older leaves more than younger leaves if the _____
A) mineral is a micronutrient
B) mineral is very mobile within the plant
C) mineral is required for chlorophyll synthesis
D) mineral is a macronutrient
E) older leaves are in direct sunlight
Answer: B
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Species of the genus Gardnerella
A. are normal flora found on the skin of humans. B. are motile spore-forming cocci. C. are thought to be a major cause of bacterial vaginitis. D. All of the choices are correct.
When assembling a fish aquarium one must add a conditioner to the water that contains bacteria capable of metabolizing fish waste such as ammonia, nitrate, and nitrite that accumulates in the aquaria water. Which of the following components of signal reception and transduction is NOT required for the bacterial two-component regulatory system for metabolizing these nitrogenous waste products?
A. NarQ receptor B. NarL transcriptional activator C. a protein kinase D. metabolic enzymes E. ligand-gated calcium channel
The internal membrane structure of the
cyanobacteria indicates that they may have been the forerunners of a. eukaryotic cells. b. chloroplasts. c. mitochondria. d. endoplasmic reticula. e. ribosomes.
To repress transcription, corepressors bind to ________, and inducers bind to ________ proteins
a. repressor proteins / inducer b. repressor proteins / repressor c. RNA polymerase / inducer d. RNA polymerase / repressor