From which part of a eukaryotic cell do microtubules radiate?

a. Flagellum
b. Nucleus
c. Centrosome
d. Mitochondrion


Answer: c. Centrosome

Biology & Microbiology

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The Monteverde Cloud Forest in Costa Rica is an example of a ____

a. national park b. nearly extinct ecosystem c. restored ecosystem d. government nature reserve e. private nature reserve

Biology & Microbiology

Which of the following is properly matched?

a. compact bone tissue; light weight b. spongy bone; matrix of dense concentric rings c. red marrow; mostly fat d. yellow marrow; major site of blood cell formation e. none of these

Biology & Microbiology

The primitive streak will develop directly into the

a. neural tube. b. embryonic disk. c. pharyngeal arches. d. somites. e. coelom.

Biology & Microbiology

What is the significance of finding evidence that zirconium/uranium rocks formed in water 4.2 million years ago?

A) The Earth coalesced from gas earlier than originally thought. B) The Earth cooled earlier than originally thought. C) Zirconium can be used for dating old rock samples. D) Radiation played a role in the origin of life.

Biology & Microbiology