Which of the following statements is true of
metabolic pathways?
a. They are enzyme-mediated sequences of
reactions.
b. They may be biosynthetic or degradative.
c. Photosynthesis is a biosynthetic pathway.
d. Catabolism is a degradative pathway.
e. All of these statements are true
E
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The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient across the membrane
â€"more acidic outside the cell than inside the cell. Phosphate transport is an example of _____. A) passive diffusion B) facilitated diffusion C) active transport D) osmosis E) cotransport
LHON is a rare mitochondrial disease caused by weak hypomorphic mutations that affect the mitochondrial electron transport chain. The first symptoms of the disease include blindness. People with LHON are usually homoplasmic because retinas must be homoplasmic mutant for a person to have disease symptoms. Which is true about a male who is heteroplasmic for the mutation that causes LHON? (Select all that apply.)
A) He is likely to develop the disease in other parts of his body. B) He may have children who are blind due to LHON. C) All of his children will most likely be homoplasmic for the wild-type mitochondria. D) Some cells in his body are probably homoplasmic.
How do the two members of a pair of homologous chromosomes differ from each other?
A) their length B) the identity and relative position of the genes present on each of the chromosomes C) their staining patterns D) the position of the centromere within each of the chromosomes E) the precise sequence of the DNA within each of the chromosomes
You have been assigned to address a problem of overpopulation of species X in a nearby county. One of the members of your team suggests introducing species Y, which is a natural predator of species X, but not normally found in the area. After some discussion, you go ahead and introduce species Y. What aspects of the hierarchical organization may be affected within a period of a several years?
A. organism, population, species B. population, species, community, biosphere C. population, species, community D. population, community