As part of a class activity, a science teacher blindfolded students and then asked them to touch a 3-D model of a cell.

One student felt a thin, flexible layer around the cell. Another student felt an organelle that had the texture of sandpaper. Which organelle did the first student feel? Which organelle did the second student feel?

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

What are some characteristics of a free enterprise economy?

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.