Which Lophotrochozoan phylum includes members that have highly segmented bodies with many repeating units that are usually separated by transverse partitions called septa?
a. Annelida
b. Mollusca
c. Platyhelminthes
d. Rotifera
Ans: a. Annelida
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Which of the following is incorrectly paired?
a. tumor—mass of cells resulting from uncontrolled growth b. metastasize—cancerous cells spreading throughout the body c. oncogenes—mutated forms of genes that regulate cell growth d. tumor suppressor gene—mutated form of a gene that suppresses growth
You label cells with a radioactive isotope of sulfur (35S). The only molecules that would be radioactively labeled in these cells are:
A. Proteins B. Lipids C. Carbohydrates D. Nucleic acids
When your physician takes your pulse, he or she is feeling the expansion and contraction of your
A) veins or venules. B) arteries and veins. C) capillaries. D) arteries or arterioles.
Which is the species that is especially intolerant of physical disturbance to their environment?
A. Secondary succession B. Intermediate disturbance hypothesis C. Pioneer species D. Indicator species E. Keystone species