Plants acquire nitrogen from:

What will be an ideal response?


Ammonium (NH4+) from bacteria and
Ammonium (NH4+) from fertilizers

Biology & Microbiology

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A substrate-level phosphorylation occurs in the citric acid cycle when _____

A) GDP is phosphorylated to produce GTP B) NAD+ is phosphorylated to NADH C) oxaloacetate is phosphorylated D) acetylation of oxaloacetate takes place

Biology & Microbiology

The antibody that is secreted in various body fluids and primarily protects those body surfaces lined with mucous membranes is:

a. immunoglobulin (Ig) G. b. IgA. c. IgM. d. IgE.

Biology & Microbiology

In this diagram of the life cycle of a fern, which structure, A, B, C, or D, must swim through free water?

1.A 2.B 3.C 4.D

Biology & Microbiology

The most commonly accepted tree of life suggests that, after the origin of life, which of the following events occurred?

a. Bacteria arose from the first self-replicating, metabolizing cells. b. There was a split between the bacteria and a line that gave rise to the prokaryotes and eukarya. c. The fusion of a bacterium and a virus gave rise to the eukarya. d. The fusion of a bacterium and an archaeon split from the protist line. e. None of the above

Biology & Microbiology