Images of living specimens can be produced using atomic force microscopes
Indicate whether the statement is true or false
TRUE
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A modified cell membrane that carries out photosynthesis using bacteriorhodopsin in the absence of chlorophyll is called a ________ membrane.
A. colorless B. purple C. orange D. green
Gram-positive bacteria have ____ and appear ____ under the microscope after Gram staining
a. thick cell walls; pink b. thick cell walls; purple c. thin cell walls; pink d. thin cell walls; purple e. thin cell walls; blue
Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the proteins are being assembled. B. during cell division. C. while the DNA is being copied into RNA. D. while the nuclear pores are open. E. after the cell is dead.
In what way do upstream activator sequences (UASs), regulatory sequences in yeast, differ from enhancers and silencers?
A) UASs can function only in the 5'? 3' direction. B) Enhancers function only downstream. C) UASs function only upstream. D) UASs function in the middle of transcription units. E) UASs function only downstream.