What is the significance of sporopollenin in bryophytes?

it forms the archegonium wall, resistant to degradation by enzymes and chemicals, thus protecting the egg.

it forms the spore wall, resistant to degradation by enzymes and chemicals, thus protecting the spores.

it is a male gamete of bryophytes, thus in the fertilization of the egg.

The endoplasmic reticulum (er) is an organelle in some cells. in these cells, it is continuous with the nuclear membrane and forms a large part of the cell\'s total membrane. sort the phrases below as describing rough er, smooth er, both, or neither. note: if you answer any part of this question incorrectly, a single red x will appear indicating that one or more of the phrases are sorted incorrectly.1) found in prokaryites and uekaryotys2) involved in protein synthesis3) involve in lipid synthesis4) contains molecular chaperones in lumen5) bound with ribosomes6) involved in toxin or drug metabolism7) large systemot internnected tubules, vesicles, and sacs8) "packages" enzymes in vesicles for secretion.

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?

What factors contribute to the effect an environmental toxin has on the human body?