In a first-class lever
A. there is no effort arm.
B. the resistance is between the fulcrum and the effort.
C. the fulcrum is in the middle, between the effort and the resistance.
D. the effort is between the resistance and the fulcrum.
Answer: C
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Match each of the cell structures with its function or description.
a. plasma membrane b. cytoplasm c. ribosome d. mitochondria e. endoplasmic reticulum f. Golgi apparatus g. lysosome h. centriole i. cilia j. flagella k. nucleus l. nucleolus m. chromatin 1. _____ Short hairlike structures on the free side of some cells 2. _____ Fluid in the cell between the nucleus and the plasma membrane 3. _____ Made of rodlike structures and are important in cell division 4. _____ “Protein factories” for the cell 5. _____ A set of membranes that form canals that wind through the cytoplasm 6. _____ “Digestive bags” of the cell 7. _____ Long “tail” that propels sperm cells 8. _____ Made up of phospholipids, cholesterol, and protein molecules 9. _____ Made of DNA in the nucleus 10. _____ “Brain” of the cell; controls all the cell’s functions 11. _____ “Power plant” of the cell 12. _____ Important in the formation of ribosomes 13. _____ Flattened sacs that process chemicals
Extracellular matrix consists of
A) lacunae and lamellae. B) heparin and keratin. C) ground substance and protein fibers. D) fixed cells and wandering cells.
Which part of the neuron is responsible for cell metabolism?
A. Body B. Dendrite C. Axon D. Synapse
Exposure to secondhand smoke can cause or increase risk of
A. heart disease, lung cancer, and low birth weight. B. high altitude sickness and sleep apnea. C. pneumonia and tuberculosis. D. sarcoidosis, multiple sclerosis, and vasculitis