Marceau is studying small single-celled organisms that contain phospholipid membranes. These organisms can be broadly classified into the domain:
A. Bacteria
B. Animalia
C. Fungi
D. Protista
A
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A cell's DNA molecules contain its genetic material. These molecules are constructed of
a. amino acids. b. proteins. c. sugars, phosphates, and bases. d. amino acids, proteins, sugars, phosphates, and bases. e. None of the other choices are correct.
Stromatolites are fossils of ancient, photosynthetic cyanobacteria
Indicate whether the statement is true or false.
SiRNAs act primarily to inhibit
a. transcription, by binding to specific genes. b. transcription, by formation of heterochromatin. c. translation, by blocking ribosomal attachment. d. translation, by binding to an mRNA.
Which of the following components of the electron-transport chain does not act as a proton pump?
(a) NADH dehydrogenase (b) cytochrome c (c) cytochrome c reductase (d) cytochrome c oxidase