Which of the following is/are true of the sheath of Leptothrix?
A. May contain ferric and manganic oxides
B. Helps protect against microbial predators
C. Attaches bacteria to surfaces
D. All of the choices are correct.
Answer: D
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Technology systems
A) contain interrelated transportation, production, and energy technologies. B) tend to last for several decades. C) are eventually replaced by more sophisticated systems. D) contain interrelated transportation, production, and energy technologies, tend to last for several decades, and are eventually replaced by more sophisticated systems.
Which is the correct order for the application of reagents in the Gram stain?
A. Crystal violet, alcohol/acetone, iodine, safranin B. Iodine, safranin, crystal violet, alcohol/acetone C. Crystal violet, safranin, iodine, alcohol/acetone D. Safranin, crystal violet, alcohol/acetone, iodine E. Crystal violet, iodine, alcohol/acetone, safranin
Acceleration or head movements cause the fluid in the vestibular apparatus to stimulate action potentials by ________
a. bending cilia on mechanoreceptors b. binding to axons of sensory receptors c. bending hair cells against the organ of Corti's tectorial membrane d. putting pressure on Pacinian corpuscles
During protein synthesis in eukaryotes, what happens during RNA splicing?
A. The product of transcription, called the primary transcript, is cut and some pieces are joined back together to form the mature mRNA. B. The product of transcription, called the secondary transcript, is cut and some pieces are joined back together to form the mature mRNA. C. The product of transcription, called the primary transcript, is cut and some pieces are joined back together to form the mature tRNA. D. The product of transcription, called the primary transcript, is cut and all pieces are joined back together to form the mature mRNA. E. The product of translation, called the primary transcript, is cut and some pieces are joined back together to form the mature mRNA.