Which one of the following factors would NOT influence the productivity of an ocean community?
A. the amount of rainfall
B. levels of autotrophs
C. the presence of nitrogen-fixing cyanobacteria
D. fertilizer runoff
E. the season of the year
Answer: A
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The ________________ can differentiate into stems, leaves, or flowers.
A. suspensor B. shoot meristem C. basal region D. central region E. root meristem
Which of the following statements about antibody-mediated immunity is CORRECT?
A. It primarily defends against viruses that have already infected cells. B. It is responsible for transplant tissue rejection. C. It protects the body against cells that become cancerous. D. It defends against parasites, bacteria, and viruses. E. It primarily defends against bacteria that have already infected cells.
What is a limitation of mass-spectrometry in proteomics?
a. Mass spectrometry requires access to a particle accelerator. b. Mass spectrometry requires large quantities of protein for accurate results. c. Variations in protein structure caused by disease can be difficult to identify. d. Proteins are destroyed in the process, making results impossible to verify.
Hemopoiesis begins early in embryonic development in the
A) bone marrow. B) spleen. C) lymphatic organs. D) yolk sac.