Plants acquire nitrogen from:
What will be an ideal response?
Ammonium (NH4+) from bacteria and
Ammonium (NH4+) from fertilizers
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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
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.
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
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