Endoplasmic reticulum (ER) with many ribosomes attached is called ________ ER, whereas endoplasmic reticulum that is mostly devoid of ribosomes is called ________ ER.
Fill in the blank(s) with the appropriate word(s).
rough, smooth
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Which eukaryotic organelle is associated with the breakdown of macromolecules?
A. endoplasmic reticulum B. Golgi apparatus C. mitochondria D. lysosome
The accompanying graph shows a growth curve of E. coli growing in a defined medium containing equal molar amounts of glucose and lactose
Based on your knowledge of the regulation of the lac operon, the best explanation of these results is that A) early on, due to the presence of lactose, the bacteria use the lac operon. Glucose is used later. B) the bacteria use both sugars simultaneously. C) the presence of glucose causes the formation of cAMP catabolic repressor protein (CRP) complexes, which shut down the lac operon until the glucose is used up. D) glucose is used first. Once glucose becomes limiting, intracellular cAMP increases, forming cAMP–CRP complexes that activate the lac operon to use lactose. E) early on the glucose binds to the repressor protein lacI and shuts down the lac operon.
Increases RNA polymerase activity
a. Methylation b. Enhancer activity c. RNA capping d. RNA spliceosome activity e. Reverse transcription
Poultry products are a likely source of infection by
A) Helicobacter pylori. B) Salmonella enterica. C) Vibrio cholerae. D) Shigella spp. E) Clostridium perfringens.