Eukaryotic cells acquired mitochondria and chloroplasts by
A. exocytosis.
B. endosymbiosis.
C. mutation.
D. pinocytosis.
E. natural selection.
Answer: B
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a. bacteria b. biomass c. nutrients d. plants e. the sun
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
When water moves from soil into the vascular tissues inside the root, it can take three possible pathways. Of these, the apoplastic route is _____.
a. through plasmodesmata b. through aquaporins on the plasma membrane c. between cells and through cell walls d. by active diffusion across the plasma membrane
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