Endotoxins are
A) associated with gram-positive bacteria.
B) molecules that bind nerve cells.
C) part of the gram-negative cell wall.
D) excreted from the cell.
E) A-B toxins.
C
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Metallic ions such as Ca2+, Na+, and Fe3+ readily form ____
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
Matching. Choose the one most appropriate answer
for each. 1. ___ compartmentalization 2. ___ effector 3. ___ habitat 4. ___ interstitial fluid 5. ___ apoptosis 6. ___ plasma 7. ___ stimulus 8. ___ tissue A. form of energy that a receptor can detect B. where an organism lives C. muscles and glands are examples D. plant response to attack E. fluid that bathes all cells F. fluid portion of the blood G. programmed cell death H. groups of cells with a common function
Which of the following viruses has not been associated with a particular type of cancer?
A) influenza virus B) hepatitis B virus C) Epstein–Barr virus D) human papilloma virus E) hepatitis C virus
Structures that have no apparent function but had a function in ancestral species are
A. the molecular record. B. development. C. homology. D. vestigial structures. E. the fossil record.