Slipped disks are very common in the United States. Which of the following can cause a slipped disk?
A) slipping on the ice in winter and breaking a vertebra of the coccyx
B) improper lifting, leading to a bulge in a disk between two lumbar vertebrae
C) two vertebrae of the sacrum slipping past each other in opposite directions
D) scoliosis
B
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________ consume organic molecules to live.
A. Photoautotrophs B. Autotrophs C. Hemitrophs D. Heterotrophs E. Plants
Answer the following statements true (T) or false (F)
1. Cells can sense changes in the environment through alterations in the extracellular matrix. 2. Wrinkling observed with aging is do to low production of the extracellular matrix molecule, fibronectin. 3. Blood vessels that can expand and contract are largely composed of collagen as a structural extracellular matrix protein. 4. Glycosaminoglycans and proteoglycans resist compression and are found in large abundance in joints of the body. 5. Cellulose from the cell wall is a primary energy store for plants.
The most diverse animal group is the:
a. mollusks b. arthropods c. nematodes d. chordates e. cnidarians
Abnormal cell division that does not pose a threat to surrounding tissues is termed _____
a. malignant b. benign c. metastatic d. carcinogenic e. repressed