The bark of a woody stem contains:
1.xylem
2.parenchyma
3.vascular cambium
4.phloem
4
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The three-dimensional shape of a protein is determined by the ____ and the results of chemical modifications and other processing events
a. interaction of R groups b. interaction with other polypeptide chains c. amino acid sequence d. bonds formed with other proteins e. initiation complex
In sequence of their occurrence, the four major steps that vertebrate organisms use to obtain and use food are
A. ingestion, digestion, absorption, and elimination. B. ingestion, absorption, digestion, and elimination. C. absorption, ingestion, digestion, and elimination. D. absorption, digestion, ingestion, and elimination. E. digestion, absorption, ingestion, and elimination.
Each of the following is true for the mechanism of the Na+/K+ ATPase pump except
A) the E2 conformation is open to the outside of the cell and has high affinity for K+. B) the E1 conformation is open to the inside of the cell and has high affinity for Na+. C) Na+ triggered phosphorylation of the pump stabilizes the E2 conformation. D) K+ triggered dephosphorylation of the pump stabilizes the E2 conformation. E) Each E1-E2 cycle pumps 3 Na+ ions out and 2 K+ ions in.
Gardasil is marketed as a cervical cancer vaccine, but it is actually a human papilloma virus (HPV) vaccine. Why is this done?
A. Genital warts is a sign of cancer. B. HPV in the cervical epithelial cells may cause the cells to become cancerous. C. Cancer cells are particularly susceptible to viral infection. D. The virus multiplies more rapidly in cancerous cells.