Which statement is correct about rough ER and smooth ER? 1. Rough ER contains ribosomes, and smooth ER transports materials other than proteins.

2. Rough ER transport materials other than proteins, and smooth ER contains ribosomes.

3. Rough ER contains ribosomes, and smooth ER transports proteins.

4. Rough ER transports proteins, and smooth ER contains ribosomes ​

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called