The sum of all chemical reactions in an organism is called ________
a. catabolism
b. anabolism
c. exchange reaction sum
d. metabolism
Answer: d
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Over the last 400,000 years, how have atmospheric CO2 levels changed? Select all that apply
A. Atmospheric CO2 levels have remained the same. B. Atmospheric CO2 levels have been steadily increasing overall. C. Atmospheric CO2 levels have been steadily decreasing overall. D. Atmospheric CO2 levels have fluctuated periodically.
Two bacterial genes are transduced simultaneously. What does this suggest about their proximity to each other within the original host genome?
A. Not a thing-it's highly likely that two separate virus particles were carrying each gene, and that they coinfected the new target cell at the same time, delivering their genetic payloads. This could mean the two original genes might not even be from the same original host cell! B. It's highly likely that the two genes are located next to each other in the original host cell chromosome. Since transduction relies on either mispackaging of bits of host cell DNA into non-functional virus units, or improper excision of lysogenic phage DNA from a host cell chromosome (carrying parts of the host cell DNA with it), the genes must lie close to each other to be transduced into a new cell simultaneously. C. They must be within five gene lengths of each other, but not necessarily immediately adjacent. If they were immediately adjacent, the transposons that facilitate the transfer of genetic information between the two cells wouldn't be able to 'jump' into them. D. It doesn't mean anything. Transduction relies on the ability of a cell to take up foreign DNA. It's possible here that the cell has simply taken up two separate bits of DNA at the same time from the surrounding environment.
An animal is a(n) _____. (choose all that apply)
a. organism e. consumer b. domain f. producer c. species g. hypothesis d. eukaryote h. trait
What is the function of the operculum?
A. to store urine until excreted B. to cleanse the blood of toxins C. to regulate buoyancy D. to detect changes in water pressure E. to pump water over the gills