These cell organelles are sacs bounded by a single membrane that contain as many as 40 different enzymes. The enzymes are all hydrolytic and catalyze the breakdown of proteins, nucleic acids, lipids, and carbohydrates.
A. E.R.
B. Mitochondria
C. Vacuole
D. Lysosome
E. Centriole
Select your answer:
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Pathogens, Disease and Immunity › ViewWhich of the following statements is TRUE about someone’s immune system that has allergies?
A. Body cells are dividing at an uncontrolled rate.
B. The body is reacting to foreign antigens that are not dangerous to most people.
C. T cells and B cells in the body cannot be activated.
D. The body is mistaking its own cells for foreign antigens.
Microbial Growth & Nutrition › View
Which microbes use sunlight as a source of energy?
A. photoheterotrophs and photoautotrophs
B. chemoheterotrophs and chemoautotrophs