The term homeostasis refers to the ability of:
A. molecules to undergo net movement by
diffusion.
B. the cell to seek out an optimal
environment.
C. the plasma membrane to control what
enters a cell.
D. the cell to control and maintain its internal
environment.
Answer Key: D
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In animal skeletal muscles, red muscle fibers
a. have an abundance of myoglobin. b. are mainly anaerobic. c. have few mitochondria. d. are good for short bursts of activity. e. more than one of these answers is true.
Which process is the driving force behind the movement of xylem sap upward through the tracheids and vessels in xylem?
1.Bulk flow 2.Osmosis 3.Plasmolysis 4.Transpiration
Which of the following statements regarding the cell-mediated immune response is TRUE?
A) Cytotoxic T lymphocytes do not require antigen presentation to become activated. B) Cytotoxic T lymphocytes interact with antibodies that have bound antigen to identify their target. C) Helper T lymphocytes have no role in the activation of cytotoxic T lymphocytes. D) Cytotoxic T lymphocytes kill by producing hydrogen peroxide. E) A single cytotoxic T lymphocyte can kill many target cells.
In the early development of an amphibian embryo, an important "organizer" is located in the
A) neural tube. B) notochord. C) archenteron roof. D) dorsal ectoderm. E) dorsal lip of the blastopore.