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3 years ago

Anonymous 4 years ago

Biology

2 answers:

Lynna [10]3 years ago

8 0

Awesome! great job =)

Rufina [12.5K]3 years ago

3 0

Answer:

1. C

2. D

3.B

4.A

Explanation:

1. Gene regulation in eukaryotes (1 point)

usually involves operons.

is simpler than in prokaryotes.

answer: allows for cell specialization

includes the action of an operator region

This occurs because is regulated by repressors and transcriptional activators

2. Specialized cells regulate the expression of genes because they (1 point)

do not want the genes to become worn out.

cannot control the translation of proteins.

do not carry the complete genetic code in their nuclei.

do not need the proteins that are specified by certain genes.**

3. What is one difference between transcription factors and miRNA (interference RNA)?

Transcription factors work at halting transcription, while miRNAs work at destroying the products of transcription

miRNA are transcribed by RNA Riboxyanucleicacid

Why does it take only a few homeotic genes to control the development of a eukaryote? (

because each homeotic gene begins a cascade of events that leads to the formation of a specific body part

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In conservative site-specific recombination, what is the name of the DNA sequence flanked by the recombinase recognition sequenc

Lady bird [3.3K]

Answer:

The correct answer will be option-Crossover region

Explanation:

Recombination is a complex process which leads to the exchange of the genetic material between sister chromatids.

The recombination process is mediated by the recombinase enzyme which recognize the specific sites and allows the formation of the protein-DNA complex called synaptic complex.

The synaptic complex contains the short asymmetric sequence called the crossover region, which represents the rejoining and the DNA cleavage site.

Since crossover region represents the recognition sequence which is flanked is known as the crossover region.

Thus, the crossover region is the correct answer.

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3 years ago

Your hair is composed of live cells that need vitamins and nutrients.True/false

san4es73 [151]

Hair cells are sensory receptors so definitely it needs food to survive which is gotten from hair cream that has vitamins and nutrients.

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3 years ago

Read 2 more answers

How many different allele combinations would be found in the gametes produced by a pea plant whose genotype was RrYY? (1 point)

Law Incorporation [45]

4 different types of allele combination would be possible
RY,
ry,
Ry,
rY

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3 years ago

In which cellular organelle do the three posttranscriptional modifications often seen in the maturation of mrna in eukaryotes oc

Mamont248 [21]

Answer:

Nucleus

Explanation:

Eukaryotic RNAs are synthesized in the form of precursors that will have to undergo a modification process in order to be functional. Prokaryotic mRNAs do not need to be modified after being synthesized and are linear with respect to the gene from which they were synthesized. That is, they are completely complementary. As for the prokaryotic rRNA and tRNA, the modifications they suffer are simple because they have to do with the cuts that the long precursor will suffer in which both species are included. However, eukaryotic mRNA, rRNA and tRNA, which are synthesized in the cell nucleus and nucleolus and subsequently used in the cytoplasm, need to undergo much more complex modification processes, not only to be functional but to be able to pass through the small nuclear pores to the cytoplasm. The objective of this conference is precisely to describe these post-transcriptional modification processes.

Modification at the 5 'or Cap 5' end

The 5 'end of the mRNA is modified in the eukaryotic nucleus (but not in the mitochondria or chloroplasts). Modification reactions are probably common in all eukaryotes. Transcription begins with a nucleoside triphosphate (almost always a purine, A or G). The first nucleotide retains its 5 'triphosphate group and forms the usual phosphodiester bond from its 3' position to the 5 'position of the next nucleotide.

Modification of the 3 'end or Poly Tail (A)

Most eukaryotic mRNAs have a polyadenyl acid sequence at the 3 'end. This terminal stretch of waste A is often described as Poly (A) tail and the mRNA with these characteristics is called poly (A) +. The poly (A) sequence is not encoded in the DNA, but is added to the RNA in the nucleus after transcription. The addition of poly (A) is catalyzed by the enzyme poly (A) polymerase, which adds ~ 200 residues of A to the free 3'-OH end of the mRNA.

Nuclear splicing

Splicing occurs in the nucleus, along with the other modifications that the newly synthesized RNA undergoes. The transcript obtains its cap at the 5 'end, loses its introns and is polyadenylated at the 3' end. Then the RNA is transported through the nuclear pores to the cytoplasm where it will be available for translation.

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3 years ago

1. If x and y vary inversely and x=3 when y=8, find y when x=4*<br> Oy=12<br> Oy=6<br> Oy=5<br> y=2

natta225 [31]

Can you please take a picture of the question. Because I don’t understand it in this format

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3 years ago