1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
OLEGan [10]
3 years ago
5

S-waves arrive at a seismic station? First Second Third Fourth

Biology
1 answer:
RSB [31]3 years ago
8 0

Answer:

First

Explanation:

S-waves arrive first at a seismic station

You might be interested in
What is true about the structure or function of the plasma membrane?
Anit [1.1K]

Answer:the first one I believe!

Explanation:

Sorry if it is wrong I have already done this and I pretty sure it’s the first one!

5 0
3 years ago
Read 2 more answers
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
The heart contracts twice for every heartbeat one contraction is the atrial contraction while the other is the venture true or f
jeyben [28]

Answer:

True. The heart contracts twice per heartbeat. One contraction is the ventricular and the other one is the artrial.

8 0
3 years ago
Fern spores usually form during:<br><br> spring<br> winter<br> summer<br> fall
aivan3 [116]

Answer:

Late summer

Explanation:

many spores ripen in late summer

8 0
3 years ago
A purebred chicken with white feathers is crossed with a purebred chicken that has black feathers. Each of their offspring has b
Lilit [14]
This happens because the straits are codominant which means both alleles of a given trait are expressed at the same time in a heterozygous individual (aka the offspring),
5 0
3 years ago
Other questions:
  • It is best say that most human sources of air pollution result from
    6·1 answer
  • Asteroids are also known as
    12·2 answers
  • If when I was a young lad, I was bitten by a turtle, can I still drink orange juice?
    13·1 answer
  • Normal leukocytes use several protective mechanisms in combating disease-causing microbes such as bacteria. Which of the followi
    11·1 answer
  • What statement is true regarding the theory of natural selection
    5·2 answers
  • Identify the statement that describes the imperfection of natural selection. Identify the statement that describes the imperfect
    5·1 answer
  • One of your team members suggested harvesting crops to supply food resources for the future Martians. Would this be a feasible s
    13·1 answer
  • .Explain how do organisms create an copy of themselves.​
    15·1 answer
  • SOMEONE HELP WHAT ARE THE ANSWERS FOR THIS!!!!
    7·1 answer
  • The phosphorus cycle ..
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!