Cells were first discovered in the

__________century.
a. 14th
b. 15th
c. 16th
d. 17th
e. 18th


Answer: c

Biology & Microbiology

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Which of the following would NOT be a component of a newly produced HIV virus particle?  

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B cells are primarily activated by the activities of ________

a. macrophages b. platelets c. helper T cells d. antigen and complement

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Trees are able to transport water from the roots to the top branches because

A. cohesion bonds water molecules to each other strongly. B. liquid water has a higher density than the air in the plant cells of the roots, trunk, and branches. C. water acts as a solvent of the tree cells as it moves upwards to the branches. D. adhesion bonds water molecules to the inside of the plant conducting tubes. E. leaves are hydrophilic.

Biology & Microbiology

The change in the developmental fates of different

cell lineages in response to signals from adjacent tissues is a. contact inhibition. b. ooplasmic localization. c. embryonic induction. d. pattern formation. e. all of these.

Biology & Microbiology