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Aliun [14]
3 years ago
10

A cell membrane that allows only certain substances to enter or leave it

Biology
1 answer:
irina [24]3 years ago
3 0
That would have to be the cell membrane an animal cell
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What are two possible ways that making plastics for electronic devices could impact the environment
myrzilka [38]

Answer:

RoHS applies to the following substances for electronic equipment and electrical appliances: lead, mercury, cadmium, hexavalent chromium, PBB (polybrominated biphenyls), and some PBDEs (polybrominated diphenyl ethers).

3 0
3 years ago
During DNA replication, an open section of DNA, in which a DNA polymerase can replicate DNA, is called a replication fork. 2. Ok
Fiesta28 [93]

The question has been answered itself but the answer will contain the detail explanation.

Answer:

1. The replication fork formation during DNA replication is important for the continuity and the addition of the further base pair on the template. The DNA initiation process starts by the formation of replication fork.

2. The okazaki fragments are the short DNA fragments that are formed on the lagging strand. These fragments are later joined by the enzyme DNA ligase.

3. Leading strand is the continuous strand that formed during the DNA replication. The direction of the leading strand is 5' to 3' .

4. DNA polymerase is the main replicating enzyme during the DNA replication process. Different types of DNA polymerase with multiple subunits are present in prokaryotes and eukaryotes.

5. The new DNA that are formed from the parental strand and complementary with each other are called daughter DNA.

3 0
3 years ago
What 2 elements is salt made out of
professor190 [17]

Answer:

Sodium and chlorine

Explanation:

5 0
3 years ago
Read 2 more answers
What is free nitrogen?
UNO [17]

Answer:

Nitrogen thet cannot be used by organisms. C.

Explanation:

Free nitrogen is simply molecular nitrogen (N2). Nitrogen, in its molecular form, consists of two nitrogen atoms bound together with a tripple bond. Because it is very stable, N2 is typically nonreactive, and takes a lot of energy to break them apart. Among these are the amino acids necessary for life to begin and which are the building blocks DNA is made from. Basically, any nitrogen that is in an organic compound is considered “fixed” nitrogen and N2 is considered to be “free” nitrogen

5 0
3 years ago
Read 2 more answers
What is the genotype of a heterozygous person with a cleft chin?
antiseptic1488 [7]

Answer:

Cc

Explanation:

A cleft chin is an example of a trait that is controlled by genetics. A cleft chin is when there is a dimple in the chin which arises when the two sides of the jaw don’t completely fuse together. Famous people with cleft chins are Henry Cavill, John Travolta and Niall Horan.

A cleft chin is generally thought to be a dominant trait. That means, if an individual carries one copy of the cleft chin gene (heterozygous), then they will display the trait.

There are three options: an individual can be homozygous dominant (CC), homozygous recessive (cc) or heterozygous (Cc). A heterozygous person will always have 2 different alleles (for any trait, not just cleft chin). In this case, a heterozygous person will have a cleft chin, because it is dominant. Therefore, an heterozygous person with a cleft chin will be Cc

Remember, the letter doesn't matter - they could also be denoted as Bb, Qq, Rr, Ff. The letter is arbitrary.

6 0
3 years ago
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