The cyanobacterium Trichodesmium ________.
A. fixes a significant amount of N2 in oceanic environments
B. uses nitrite as a source of nitrogen
C. is a spherical organism
D. fixes N2 during the day
Answer: A
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Which of the following is the correct organizational hierarchy, from largest to smallest, in the hierarchical order of life? (Some levels have been omitted, so you are looking for the correct order.)
A. Biosphere ? Community ? Population ? Tissue ? Organ ? Cell ? Atom ? Molecule B. Ecosystem ? Population ? Community ? Organ system ? Organ ? Cell ? Molecule ? Atom C. Community ? Ecosystem ? Population ? Tissue ? Organ ? Cell ? Organelle ? Atom D. Ecosystem ? Community ? Population ? Organ ? Tissue ? Cell ? Molecule ? Atom
In which phase of mitosis do chromosomes arrive at opposite sides of the cell?
a. anaphase b. prophase c. metaphase d. telophase e. interphase
The most ancient group of plants alive today are:a
horsetail. b. club moss. c. hornworts. d. liverworts. e. gymnosperms.
During __________, the phage remains latent.
a. lysogeny b. the lytic cycle c. budding d. assembly