When the end product of a pathway inhibits catalysis of the first step of that pathway, this phenomenon is called ________.
A. feedback inhibition
B. reversible covalent modification
C. noncompetitive inhibition
D. metabolic channeling
Answer: A
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Which of the following choices best describes the earliest cells?
a. aerobic heterotrophic eukaryotes b. anaerobic prokaryotes c. heat-resistant Archaea d. photosynthetic marine eukaryotes
Bones in joints are connected by ligament
1.True 2.False
The process of photosynthesis involves the conversion of:
a. oxygen and water into sugar. b. sugar into starches and cellulose. c. oxygen and sugar into water. d. carbon dioxide and water into sugar. e. sugar and water into lipids.
Which of the following statements about transcriptional regulators is false?
(a) Transcriptional regulators usually interact with the sugar-phosphate backbone on the outside of the double helix to determine where to bind on the DNA helix (b) Transcriptional regulators will form hydrogen bonds, ionic bonds, and hydrophobic interactions with DNA (c) The DNA-binding motifs of transcriptional regulators usually bind in the major groove of the DNA helix (d) The binding of transcriptional regulators generally does not disrupt the hydrogen bonds that hold the double helix together