Communities near benthic hydrothermal vents survive in perpetual darkness, where no photosynthesis
is possible. What do the producers of this ecosystem use as an energy source?
What will be an ideal response?
Hydrogen sulfide from the hot water vents serves as an energy source for autotrophic bacteria. These
bacteria act as primary producers for the ecosystem, sometimes residing as endosymbionts in larger
organisms.
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_________ occurs when 50% of a protein produces a different phenotype than that produced by 100% or 0% of the protein.
A. Incomplete dominance B. Recessive inheritance C. Codominance D. Loss of function mutation E. Hybridization
Nuclear pores function as gateways for molecules to enter and exit a nucleus. Protein synthesis offers an example of why this movement is important. Explain
What will be an ideal response?
Calcium ions are stored in the sarcoplasmic reticulum
____________________ Indicate whether the statement is true or false.
In the Ames test, mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine. Therefore, these bacteria require histidine in the growth plate to survive. A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that Salmonella typhimurium is living on a histidine-free growth plate. What can be concluded from these results?
A. The bacteria produce histidine. B. The newly synthesized compound induces a mutation in the bacteria and the bacteria no longer produce histidine. C. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine. D. The bacteria no longer produce histidine. E. The newly synthesized compound induces a mutation in the bacteria.