The function of the torus in the walls of tracheids is:

A. allowing the passage of water
B. stopping backflow of water
C. secretion of resin
D. sealing off air bubbles
E. allowing the escape of air


D. sealing off air bubbles

Biology & Microbiology

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Some viruses have the ability to stimulate uncontrolled growth of the host cells, resulting in cancer. Which virus has oncogenic properties?

a. Measles b. Papilloma c. Retroviruses d. Influenza

Biology & Microbiology

When serum proteins are separated by electrophoresis and then antibodies specific for the serum proteins are placed in a parallel trough in order to form reaction arcs for each protein, the test is called

A. Ouchterlony double diffusion B. Western blot C. immunelectrophoresis D. radioimmunoassay (RIA) E. the Quellung test

Biology & Microbiology

Only one of the hypotheses about how complex molecules formed on Earth can be correct.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Suppose a sample of five retail stores' monthly profits are: $4,000, $7,000, $5,000, $3,000, and $1,000. What will the sample variance of stores profits be?

A. $4 million B. $20 million C. $10 million D. $5 million

Biology & Microbiology