Which of these describes the structure of the endoplasmic reticulum A:A system of folded membranes B:A tiny organelle that has no membrane C:A rigrid protective layer found outside of the cell membrane D:an organelle surrounded by a double membrane and containing DNA

A: A system of folded membranes

Explanation:

The endoplasmic reticulum is one of the organelles found in an eukaryotic cell. It is a membrane-bound organelle made up of two structures called CISTERNAE (sac) AND SHEET (membranous)

The endoplasmic reticulum is part of the endomembrane system, which is a system of folded membranes, which extends to the membrane that bounds the nucleus. It is of two types viz: rough endoplasmic reticulum and smooth endoplasmic reticulum.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).