Eukaryotic cells acquired mitochondria and chloroplasts by

A. exocytosis.
B. endosymbiosis.
C. mutation.
D. pinocytosis.
E. natural selection.


Answer: B

Biology & Microbiology

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In humans an extra copy of chromosome 21 typically leads to moderate to severe mental retardation

and sterility, as well as a greater likelihood of heart defects and other problems. This disorder is known as ____.

a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome

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When water moves from soil into the vascular tissues inside the root, it can take three possible pathways. Of these, the apoplastic route is _____.

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What type of muscle cell has branching, striated cells, each containing a single nucleus?

a. cardiac muscle b. rough muscle c. skeletal muscle d. smooth muscle

Biology & Microbiology