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Marizza181 [45]
2 years ago
11

Arrow A is indicating a(n) _____ protein.A structure of a cell showing many types of proteins with different functions outside a

nd inside the cell.
A. A protein marked A is a hollow cylinder comprising filaments, which connect to the cell membrane.
B. A protein marked B is located in the cytoplasm and has a specific binding site.
C. A protein marked C is a small spherical protein outside the cell. An integral membrane protein marked D is bonded to an oval green structure via a specific binding site of D on the side of the cytoplasm.
D. An integral membrane protein marked E consists of two subunits, which are tightly connected to each other.
Biology
1 answer:
agasfer [191]2 years ago
7 0

Answer:

Microtubules composed of tubulin protein.

Explanation:

The cytoskeleton is composed of three well defined filamentous structures: microtubules, microfilaments, and intermediate filaments. Each of these filamentous structures is a polymer of proteinic subunits united by weak, not covalent connections.

Microtubules are long hollo cylindric tubes with no ramifications of a diametre near to 25 nanometers. They are constituted by two subunits of tubulin protein which polymerize to form microtubules. These filaments shape the cell and are involved in intracellular transport.  Microtubules extend from an organizing center near the nucleus to the cellular surface.

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The y-shaped site at which a double-stranded molecule of dna is separated into two single strands for replication.
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The Y shaped structure with active region present is called replication fork

The separation of the 2 single strands of DNA creates a ‘Y’ form referred to as a replication ‘fork’. the 2 separated strands will act as templates for making the new strands of DNA.

LEADING STRAND

one of the strands is oriented in the 3’ to 5’ path (toward the replication fork), this is the main strand?. the other strand is oriented inside the 5’ to 3’ direction (away from the replication fork), that is the lagging strand?.

because of their extraordinary orientations, the 2 strands are replicated in a different way: A small piece of RNA called a primer (produced by means of an enzyme referred to as primase) comes along and binds to the end of the leading strand. The primer acts as the place to begin for DNA synthesis.

DNA polymerase? binds to the leading strand after which ‘walks’ alongside it, including new complementary? nucleotide? bases (A, C, G and T) to the strand of DNA within the 5’ to 3’ direction.

This form of replication is referred to as continuous

LAGGING STRAND

Several RNA primers are made by means of the primase enzyme and bind at numerous points alongside the lagging strand.

Chunks of DNA, known as Okazaki fragments, are then introduced to the lagging strand also in the five’ to a few’ path.

This sort of replication is known as discontinuous as the Okazaki fragments will want to be joined up later.

Once all the bases are matched up (A with T, C with G), an enzyme referred to as exonuclease strips away the primer(s). The gaps wherein the primer(s) were are then filled by but extra complementary nucleotides.

The brand new strand is proofread to make sure there are no errors inside the new DNA series.

eventually, an enzyme referred to as DNA ligase? seals up the sequence of DNA into two non-stop double strands.

The end result of DNA replication is two DNA molecules consisting of 1 new and one old chain of nucleotides. That is why DNA replication is described as semi-conservative, 1/2 of the chain is part of the unique DNA molecule, half is ultra-modern.

Following replication the brand new DNA routinely finishes up into a double helix.

To know more about DNA replication click here

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Natural selection means
borishaifa [10]
Pretty sure that the answer is A
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2 years ago
What are local problems that the endangerment of honeybees causes?
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Answer:

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Answer:

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As blood glucose returns to its baseline level, what happens to the levels of insulin and glucagon in the blood
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