Nephridia are the paired structures used in excretion in

A. planarians.
B. humans.
C. insects.
D. earthworms.


Answer: D

Biology & Microbiology

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A Barr body exists for the purpose of

a. protein dosage compensation. b. insuring fertilization. c. blocking the activity of the Y chromosome. d. turning on the SRY gene. e. activating master genes

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"Net primary productivity" is

A. the amount of energy used in metabolism by producers. B. the amount of energy given off as heat by producers. C. the amount of energy trapped by the autotrophs of an ecosystem. D. the amount of energy available for consumers. E. the amount of energy used in metabolism by consumers.

Biology & Microbiology

Which of the following is properly matched?

A. Osteoblasts and bone breakdown B. Osteocytes and initial bone formation C. Osteoclasts and initial bone formation D. Osteoclasts and bone breakdown E. Osteoblasts and cartilage formation

Biology & Microbiology

Give an example of an enzyme that functions inside human cells and its function ________

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology