Which cells form the lung tissue component of the respiratory membrane?
A) type I alveolar cells
B) type II alveolar cells
C) alveolar macrophages
D) ciliated cells
E) goblet cells
Answer: A) type I alveolar cells
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Flowering in Arabidopsis appears to require ____
a. production in leaves of CO protein and FT protein b. movement of CO protein from leaves to the shoot apex c. expression of CO protein in the shoot apex d. movement of FT mRNA from leaves to the shoot apex e. movement of FT protein from leaves to the shoot apex
The sum total of all the resources we use is called the ____
a. demographic transition model b. age-structure diagram c. habitat d. ecological footprint e. transitional age
Which of the following do not get infected by viruses?
A. Plants B. Animals C. Bacteria D. Animals, plants and bacteria can all be infected by viruses.
What are nematocysts?
a. reproductive cells b. excretory organs c. sets of muscle cells
d. circulatory cells e. defensive cells