Which of the following is a member of the domain bacteria?
a. euglena
b. methanogens
c. halophiles
d. cyanobacteria
e. giardia
Ans: d. cyanobacteria
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Describe the significance and relationship of the genus and species taxons. If there were not humans
on earth to classify organisms, would species still exist? What will be an ideal response?
Chloroplasts in algae probably arose from which source?
A. cyanobacteria B. aerobic bacteria C. anaerobic bacteria D. photosynthetic viruses E. aerobic fungi
During the biosynthesis and transport of collagen from the endoplasmic reticulum through the Golgi apparatus to the cell surface, collagen fibrils form extracellularly rather than intracellularly. Which of the following does not help to explain why this happens?
a. Type I procollagen synthesized in cells contains nonhelical segments at each end of the polychain that limit their ability to oligomerize into collagen fibrils. b. Procollagen must be soluble and small enough to fit within the intracellular transport machinery. c. Type I procollagen cannot form the triple helical oligomers that are the core structure of any collagen oligomer. d. Type I procollagen contains hydroxylated proline and lysine residues that prevent polypeptide chain oligomerization within the cell.
As electrons flow through complexes in the inner mitochondrial membrane, protons are moved from the matrix to the intermembrane space. This can make the pH
A) the same in the matrix and the inner membrane space. B) lower in the matrix. C) lower in both the matrix and the inner mitochondrial space. D) lower in the inner membrane space.