Biology help!!

The process of mRNA processing eukaryote is modeled above. what does the addition of the poly-A tail provide for the cell?

tangare [24]

Answer:

D

Explanation:

An enzyme called poly (A) polymerase (PAP) is part of the same protein complex that cleaves the pre-mRNA and it immediately adds a string of A nucleotides, called the poly (A) tail, to the 3′ end of the just-cleaved pre-mRNA. The poly (A) tail added protects the mRNA from degradation, aids in the exportation of the mature mRNA to the cytoplasm and helps in binding proteins involved in initiating translation.

7 0

3 years ago

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Hi. Please answer these questions :

musickatia [10]

<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Answer:</h2><h2>_____________________________________</h2><h2> $\huge{\textbf{Plant of Barbados}}$ </h2>

$\texttt{Caesalpinia pulcherrima}$ commonly called Pride of Barbados is found in the tropical regions. It's origin is still unknown but it is believed that Pride of Barbados is native to the West Indies and tropical America. It is widely cultivated in tropical regions throughout the world, which include tropic and sub-tropic region of America. It contains gallic and tannic acid which is poisonous to humans.

As <u>Cesalpinia pulcherria</u> is considered to be native of West Indies or North American region, and the Barbados is a small island country in West Indies, so that's how its common name comes that is the <u>Pride of Barbados</u>. Pride of Barbados belongs to the FAMILY - LEGUMINOSAE and to the SUB-FAMILY - FABACEAE.

$\huge\textbf{Placentation}$

The arrangement of placenta within the ovary is known as placentation. Ovules are attached to the inner wall of special tissues which are called placenta, the ovules are attached by the small stalk called funicules. There are several type of Placentations i.e. Basal, Marginal, central, axile, parietal.

Placentation in Plants of Barbados is Marginal, Marginal Placentation is when in which the placenta forms a ridge along the ventral suture(The line of fusion where the margins of the mega-sporophypl join) of the ovary and the ovules develop on two separate rows is known to have marginal placentation.

$\huge\textbf{Gynoecium}$

Gynoecium is a female whorl of the flower. It is composed of Carpels. Carpel is composed of Sigma, Style and Ovary.

Gynoecium in Pride of Barbados is Monocarpellary(one carpel), Ovary Superior(An ovary attached above other floral parts is termed superior), consist of one chamber(unilocular), many ovules are present along the margin. Seed is non-endospermic and Fruit is legume.

<h2>_____________________________________</h2><h2> $\huge\textbf{Flower:}$ </h2>

Flower is the reproductive organ of a plant. Morphologically it is very modified shoot. It is developed in the axil of leaf or at a.p.e.x of stem & branch. Flower is also produced in group which is called the inflorescence. If stalk called pedicel is present then flower is called pedicellate, If pedicel is absent Flower is called sessile. If small leaf or scale called bract is present then flower is called bracteate, if absent then called ebracteate.

Flower in Pride of Barbados is Pedicellate, complete, bisexual, zygomorphic, perigynous, showy and scented pentamerous.

<h2>_____________________________________</h2><h2> $\huge\textbf{Features}$ </h2>

Butterflies are the primary pollinators of Caesalpinia pulcherrima and the pollen is carried primarily on their wings.
Plant of Barbados is poisonous
It has some anti-inflammatory substances.
This plant grows in sunny regions thus It has great heat resistant feature
It can grow easily in very dry soil. This is due to its drought resistant features.

<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2><h2 />

3 0

3 years ago

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What is the main function of nervous tissue?

nekit [7.7K]

Nervous tissue is found in the brain, spinal cord, and nerves. It is responsible for coordinating and controlling many body activities. It stimulates muscle contraction, creates an awareness of the environment, and plays a major role in emotions, memory, and reasoning.

3 0

3 years ago

What kind of molecule is shown on the diagram below

OverLord2011 [107]

When you encounter a molecule like this, you've encountered a Triglyceride:

Glycerol + Fatty acid + Fatty acid + Fatty acid (1 Glycerol + 3 Fatty acids).

Hope it helped,

Happy study/ study/ exam!

6 0

3 years ago

Why was miasma theory replaced?

vredina [299]

Answer:

Miasma theory was replaced because John Snow collected data that showed that germs cause disease.

Explanation:

The theory of miasma was proposed in the past when some scientists —like doctors Thomas Sydenham and Giovanni Maria Lancisi— thought that disease was the product of emanations originated by the decomposition of organic matter. This theory was based on the fact that diseases predominated in places with poor hygienic conditions.

John Snow, an english physician, was one of the main contributors to the <u>microbial theory of disease</u>. In 1854, while a cholera epidemic was occurring, he collected data and organized it statistically and then concluded that the disease was caused by germs present in drinking water. This <u>data was contrary to the miasma theory, which would eventually be displaced by the microbial theory of the disease</u>.

5 0

3 years ago