BIOLOGY COLLEGE

After double fertilization, a zygote and ________ form.an ovule
endosperm
a cotyledon
a suspensor

Answers

Answer 1
Answer:

Answer:

endosperm

Explanation:

Double fertilization in angiosperms is a process that ensures both the formation of the embryo, giving rise to a new plant, and the endosperm, a nourishing tissue. Double fertilization is a process in which one gamete joins the oosphere, while another joins the polar nuclei. For this phenomenon to occur, a number of factors are required, which begin with pollination.

The result of double fertilization occurs when the male gamete merges with the female gamete called the oosphere, this fusion is responsible for giving rise to the diploid embryo, which can form a new individual. Already the gamete that fuses to the polar nuclei is responsible for giving rise to the so-called endosperm, which is triploid. In short, after double fertilization a zygote and an endosperm form.

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In a population where most of the individuals have long, narrow noses, a child is born with a shorter, broader nose. what's the most likely explanation for this variation?

Answers

The varios is because the parents likely had long noses as phenotypic property but one of them or both of them had shorter nkse as genotypic property that is recessive character

Why do cells have different shapes if most cells have the same organelles?

Answers

Answer:

cells have different shapes because they do different things

Explanation:

each cell type has has its own role to play in helping our bodies

to work properly

What is the function of neurotransmitters?

Answers

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Answers

Answer:

25

Explanation:

Why is a cap added to mRNA, but not to tRNA or rRNA?A-Transfer RNA and rRNA exhibit complex structures with double stranded regions. The three-dimensional shapes of these molecules keep the 5\' end of the RNA away from the enzymes that process the cap.B-Transcription and processing of mRNA occur in the nucleus, where cap binding proteins are found. These proteins, which add and modify the cap, are not found in the cytoplasm, where tRNA and rRNA are transcribed and processed.C-Each of the three types of RNA are transcribed by different RNA polymerases. Only RNA polymerase II, involved in mRNA synthesis, contains a domain capable of interacting with enzymes that form the cap.D-Only mRNA contains introns. Capping occurs simultaneously with intron removal because the same enzymes and proteins involved in both of these processes must bind to RNA at the same time.

Answers

Answer:

The correct option is C ' Each of the three types of RNA are transcribed by different RNA polymerases. Only RNA polymerase II, involved in mRNA synthesis, contains a domain capable of interacting with enzymes that form the cap.'

Explanation:

All the different type of RNA's undergo the process of transcription. However, their transcription is carried on by different types of RNA polymerases.

The transcription of the mRNA is carried by RNA polymerase II. The process of capping is essential so that the mRNA is stopped from degradation.

The rRNA is transcribed by RNA polymerase I which cannot add a cap tothe RNA.

The tRNA is transcribed by the RNA polymerase II, but the domain is different which cannot undergo the process of capping.

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Answers

Answer:

α‑ketoglutarate dehydrogenase

Explanation:

This is an enzyme complex ,which is analogous to pyruvate dehydrogenase. . Its catalytic activity is inhibited by it products succinyl Co A,it is also refers to as oxoglutarate dehydrogenase complex.(OGDC).

This enzyme complex  is similar to pyruvate dehydrogenase in  having  the same subunit structure, and using  the same type of co-enzyme.    
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