The hard, outer shell of vertebrate bone
A) does not contain osteons.
B) is spongy bone.
C) is made of glucosamine.
D) is compact bone.
D
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Match the following descriptions (A-C) with the terms in the table. These descriptions may be used more than once or not at all
a. an extracellular matrix component b. a cell adhesion molecule c. part of the cytoskeleton 1. lignin 2. collagen 3. integrin 4. actin 5. microtubule 6. cellulose 7. middle lamella 8. cadherin 9. tubulin 10. keratin 11. pectin 12. intermediate filament 13. microfilament What will be an ideal response?
Why is the protein-first hypothesis not accepted by most scientists?
a. Proteins cannot be catalysts. b. There is no known mechanism of protein self-replication. c. Of all of the macromolecules, only DNA can self-replicate. d. There is no evidence that proteins can store information. e. Proteins are too complex to have been the first "polymers of life."
What tiny structures increase the root's surface area available for taking up soil water along with dissolved oxygen and mineral ions?
a. vascular bundles b. fibrous roots c. root hairs d. pericycle e. vascular cylinder
Which structure controls the activity of all the others?
A) ovary B) testis C) hypothalamus D) pituitary gland