Which of the following convert soil ammonium to nitrate?

A) nitrifying bacteria
B) ammonifying bacteria
C) mycorrhizae
D) nitrogen-fixing bacteria


A

Biology & Microbiology

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Two of the main ingredients in plant fertilizer are phosphorus and nitrogen. These elements are required for the synthesis of __________________, respectively, in the cells of the plants

A. DNA and proteins B. proteins and complex carbohydrates C. complex carbohydrates and DNA

Biology & Microbiology

________ are seedless vascular plants

A) Ferns B) Angiosperms C) Bryophytes D) Gymnosperms

Biology & Microbiology

Some of the daughter cells resulting from clonal selection of a B cell differentiate into plasma cells. Which of these is a function of plasma cells?

A) They produce specific antibodies and release them into the blood. B) They transform into helper T cells and bind to antigens displayed by a dendritic cell. C) They act as natural killer cells and destroy cancer cells. D) They are responsible for cell-mediated immunity.

Biology & Microbiology

In the three-domain system, the eukaryotes are represented

A) only within the domain Eukarya. B) only within the domain Archaea. C) only within the kingdom Protista. D) in all three domains.

Biology & Microbiology