Lysosomes are vesicles that

A) originate from the rough endoplasmic reticulum.
B) are involved in intracellular digestion of food particles.
C) contain fluids or solid particles to be digested, excreted, or stored.
D) contain fats and glycogen.


Ans: B) are involved in intracellular digestion of food particles.

Biology & Microbiology

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Which of the following statements best summarizes evolution as it is viewed today?

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The DNA molecule usually is made up of how many

strands? a. 1 b. 2 c. 3 d. 6 e. 12

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When, how, and to what extent any gene control

mechanism comes into play depends on a. the type of cell. b. the cell’s function. c. the cell’s chemical environment. d. signals from the cells external environment. e. all of these.

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Transgenic mice carrying a mutant human SOD1 gene are used as models to study _____________________. Fill in the blank(s) with the appropriate word(s)

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