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If it weren't for greenhouses gases, what would be the temperature of the earth be like?

lara [203]

answer:

earth's average temperature would be near 0°F (or -18°C)

explanation:

greenhouse gases in the air, mainly carbon dioxide, methane, and water vapor, trap radiation from the Sun and act as a thermal blanket around the planet. without the greenhouse effect, earth would have an average temperature of -18 °C and be covered in ice. life as we know it would not be able to survive.

good luck :)

hopefully this helps

have a great day !!

7 0

3 years ago

What is the liquid that holds plant and animal cells together?

sattari [20]

It is the jelly-like fluid in cell - holds all other organelles in place - it is like Jell-O. nucleus. - in both plant and animal cells - controls and directs all of the cells activities - protects a cells genetic material called chromatin - chromatin contains all the instructions for what proteins it should make - protected by the nuclear membrane

8 0

3 years ago

Summarize what happens during the process of cell division

Natasha_Volkova [10]

Hello,

In cell division, a cell copies its DNA, divides the nucleus, separates the sister chromatids, and then splits into two daughter cells.

Hope this helpsA :)

3 0

3 years ago

What fossils did scientists find in Paisley cave?

vagabundo [1.1K]

These include materials with the oldest DNA evidence of human habitation in North America. The DNA, radiocarbon dated to 14,300 years ago, was found in fossilized human coprolites uncovered in the Paisley Five Mile Point Caves in south-central Oregon.

8 0

3 years ago

What proportion of DNA molecules will contain any radioactivity after two rounds of replication?

Vladimir [108]

Answer: After two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

Explanation:

In semi-conservative replication, two DNA molecules are created, each consisting of one strand of the original DNA and one new complementary strand. In other words, the DNA is formed from one old strand and one new strand. And the existing strands serve as a complementary mould to the new ones.

Meselson-Stahl's experiment involves growing the bacterium Escherichia coli in a medium containing radioactive nitrogen. Watson and Crick had predicted that DNA replication was semi-conservative, if so the DNA extracted from the bacteria would be somewhere in between the DNA extracted from the "normal" nitrogen medium and the radioactive nitrogen medium.

DNA replication, which occurs only once in each cell generation, requires many "building blocks", enzymes, and a great deal of energy in the form of ATP. The nucleotides, which are the building blocks of DNA, have to be assembled and available in the nucleus along with the energy to bind them together. Each nucleotide consists of three parts: a nitrogen-containing ring structure called a nitrogen base, a five-carbon sugar, and at least one phosphate group.

Through the action of DNA polymerase during replication, new nucleotides bind to the corresponding nucleotide of the original chain (A to T, C to G).

Since the DNA strands are anti-parallel, and replication proceeds only in the 5' to 3' direction on both strands, one strand will form a continuous copy, while the other will form a series of short fragments known as Okazaki fragments. The chain that is synthesized continuously is known as the forward chain and the chain that is synthesized in fragments is known as the backward chain.

Then, since replication is semi-conservative, the new strand will have nucleotides with "normal" nitrogen while the new strand created from that same DNA molecule will incorporate nucleotides with radioactive nitrogen. So, after two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

7 0

3 years ago