The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is a characteristic common to all of these extracellular structures?
A) They must block water and small molecules to regulate the exchange of matter and energy with their environment.
B) They must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume.
C) They are constructed of polymers that are synthesized in the cytoplasm and then transported out of the cell.
D) They are composed of a mixture of lipids and nucleotides.
C
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Sensory receptors respond to a novel stimulus with a:
A. high firing rate. B. low firing rate. C. initially high firing rate. D. initially low firing rate.
The combination of DNA and protein in the nucleus of a eukaryotic cell is called:
a. nucleoplasm b. plasmids c. nucleoids d. chromatin
What feature do the carbon and nitrogen cycles have in common?
A. A large atmospheric component B. Many microbes involved in cycling C. Mostly local cycling D. Often a limiting nutrient E. Involvement in global climate change
What structure is formed from both fetal and maternal tissue?
A. Yolk sac B. Amnion C. Placenta D. Chorion