In which of its forms do plants generally take up nitrogen for their use?
a. mainly as NH4+
b. mainly as N2
c. mainly as NH3
d. mainly as NO3?
Answer: d. mainly as NO3?
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Stage I of trypanosomiasis characteristically involves systemic trypanosomiasis infection without central nervous system (CNS) involvement. Lymphadenopathy is also a feature of this disease. The trypomastigotes of which protozoa are involved?
a. T. cruzi b. T. rangeli c. T. brucei rhodesiense d. T. brucei gambiense
Why is ubiquitin nicknamed the "doom tag"?
a. When ubiquitin binds to a target protein, the ubiquitin enzyme degrades the protein. b. When ubiquitin binds to a target protein, the complex is sent to the proteasome and degraded. c. If a cell is deficient in ubiquitin, the cell will die. d. High levels of ubiquitin in a cell cause the cell to destroy vital proteins, leading to premature cell death. e. Ubiquitin binds to ribosomes and prevents them from translating proteins necessary for cell survival.
If four genes are in the same region of a eukaryotic chromosome, then
A) the four promoters must be oriented such that two genes are transcribed using the Watson strand as a template and two genes use the Crick strand. B) the four promoters must be oriented such that all four genes are transcribed using the same strand as the template. C) the four promoters may be oriented such that some of the genes are transcribed using the Watson strand as template, and others use the Crick strand. D) the genes can be transcribed from different strands only if their promoters are more than 1 kilobase apart. E) the genes must be in a gene family.
Marsupials are thought to be most closely related to:
a. placental mammals. b. monotremes. c. reptiles. d. birds. e. amphibians.