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murzikaleks [220]
3 years ago
9

Endosymbiosis can best be described as:

Biology
1 answer:
padilas [110]3 years ago
8 0
I think the correct answer from the choices listed above is option C. Endosymbiosis can best be described as one organism living completely inside another organism. <span>Symbiogenesis, or </span>endosymbiotic theory<span>, is an evolutionary </span>theory<span> which explains the origin of eukaryotic cells from prokaryotes.</span>
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Sort the descriptions based on asexual or sexual reproduction
MariettaO [177]

Answer: creates genetically identical offspring,  organism doesn’t have to waste energy to find a mate organism, requires the contribution of a single parent.

Explanation: While asexual reproduction only involves one organism, sexual reproduction requires both a male and a female.

Some plants and unicellular organisms reproduce asexually. Most mammals and fish use sexual reproduction.

Asexual Reproduction                   Sexual Reproduction

Two or more                                     One or more

8 0
3 years ago
DNA Polymerase helps copy a DNA molecule during the process of what?
PtichkaEL [24]
The DNA polymerases are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA. These enzymes are essential to DNA replication and usually work in pairs to create two identical DNA strands from one original DNA molecule. During this process, DNA polymerase “reads” the existing DNA strands to create two new strands that match the existing ones.

Every time a cell divides, DNA polymerase is required to help duplicate the cell’s DNA, so that a copy of the original DNA molecule can be passed to each of the daughter cells. In this way, genetic information is transmitted from generation to generation.

Before replication can take place, an enzyme called helicase unwinds the DNA molecule from its tightly woven form. This opens up or “unzips” the double stranded DNA to give two single strands of DNA that can be used as templates for replication.

DNA polymerase adds new free nucleotides to the 3’ end of the newly-forming strand, elongating it in a 5’ to 3’ direction. However, DNA polymerase cannot begin the formation of this new chain on its own and can only add nucleotides to a pre-existing 3'-OH group. A primer is therefore needed, at which nucleotides can be added. Primers are usually composed of RNA and DNA bases and the first two bases are always RNA. These primers are made by another enzyme called primase.

Although the function of DNA polymerase is highly accurate, a mistake is made for about one in every billion base pairs copied. The DNA is therefore “proofread” by DNA polymerase after it has been copied so that misplaced base pairs can be corrected. This preserves the integrity of the original DNA strand that is passed onto the daughter cells.



A surface representation of human DNA polymerase β (Pol β), a central enzyme in the base excision repair (BER) pathway. Image Credit: niehs.nih.gov

Structure of DNA polymerase

The structure of DNA polymerase is highly conserved, meaning their catalytic subunits vary very little from one species to another, irrespective of how their domains are structured. This highly conserved structure usually indicates that the cellular functions they perform are crucial and irreplaceable and therefore require rigid maintenance to ensure their evolutionary advantage.

7 0
3 years ago
Point S is _____. inside the circle on the circle collinear with the diameter AC outside the circle
Step2247 [10]
I just did it and got it correct the answer is inside the circle which is the first one. Good luck on the questions.
6 0
3 years ago
True or false
gregori [183]
I think true don't count me 100 percent
6 0
3 years ago
The cell membrane contains channels and pumps that help move materials from one side to the other. What are these channels and p
frutty [35]

Answer:

D protein it taste good very good

8 0
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