Why do toxins accumulate at such high levels in carnivores?
What will be an ideal response?
Answer: The biomass at any given trophic level is accumulated from a much larger toxin-containing biomass ingested from the level below.
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The evolution of similar forms in different lineages when exposed to the same selective pressures is
A. called divergence. B. called convergence. C. referred to as successive homologies. D. referred to as descent. E. also known as natural selection.
Arrange the steps in translation in order from earliest to latest
A) movement of the ribosome three bases closer to the 3' end of the mRNA B) peptide bond formation C) identification of initiator codon and joining of large and small ribosomal subunits D) release of the polypeptide from the ribosome and dissociation of ribosomal subunits E) binding of a charged tRNA to a codon in the A site of ribosome
Steroid hormones act by
a. interacting with a target cell's DNA. b. activating mitochondria in target cells. c. acting on ribosomes for protein synthesis. d. stimulating mitosis. e. helping glucose into the target cell.
Why do eukaryotic cells have to undergo the individual steps of mitosis while prokaryotic cells can merely pull in half by binary fission?
What will be an ideal response?