Which of the following organelles has only a single membrane around it?

A) ribosome
B) nucleus
C) mitochondrion
D) chloroplast
E) peroxisome


Answer: E

Biology & Microbiology

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The structures labeled "D" in the accompanying figure _____

a. prevents movement of materials between cells b. allows passage of a signal to contract heart muscles c. allows the free passage of materials between cells d. is found mostly in stomach tissue e. is found in most tissues except heart muscle

Biology & Microbiology

Enzymes are usually named based on

A. the substrates they act on and the type of reaction they catalyze. B. the type of reaction they catalyze. C. the substrates they act on. D. their molecular structure. E. All of the choices are correct.

Biology & Microbiology

Bone-forming cells that secrete unmineralized bone matrix called osteoid. Osteoblasts are actively mitotic.

What will be an ideal response?

Biology & Microbiology

Endemic means a species ____.

A. evolved in one geographic region and lives nowhere else B. is on its way to extinction C. feeds only on one type of food D. is extinct in the wild E. is completely extinct

Biology & Microbiology