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3 years ago

PLEASE HELP ASAP!!!!!!!!!!!! WILL MARK BRAINLIEST

Biology

1 answer:

Fantom [35]3 years ago

5 0

Answer:

the structure

the cell nucleus is a membrane-bound structure that contains a cell's hereditary information and controls its growth and reproduction. It is the command center of a eukaryotic cell and is usually the most notable cell organelle in both size and function.

Explanation:

Advantages

The presence of a nucleus in eukaryotic cells gives eukaryotes two advantages. The nucleus represents an additional protective enclosure of the DNA. As a result, eukaryotic DNA is less susceptible to mutations. The nucleus also makes reproduction easier to control.

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When Mendel crossed true-breeding tall pea plants with true-breeding short pea plants, all the offspring were tall. Then he allo

uysha [10]

Answer:

3:1

Explanation:

Let the allele for tall plant be T; &

The allele for short plant be t

When Mendel crossed true-breeding tall pea plants(i.e TT) with true-breeding short pea plants(I.e tt); all the offspring were tall.

TT × tt

T T

t Tt Tt

we can deduce from the punnet square that the F1 offspring are all heterozygous tall plant.

Now, if the first generation (F1) tall plants are allowed to self-pollinate; we have a cross between Tt and Tt

TT × tt

T t

T TT Tt

t Tt tt

We can see phenotypically that we have 3 tall plant(TT,Tt, Tt) and 1 short plant(tt).

Therefore the ratio of phenotypes he expected in the F2 generation is (3:1)

3 0

3 years ago

2. Number the steps of protein synthesis 1-4 (1 being the beginning and 4 being the

Margarita [4]

Proteins synthesis includes transcription and translation. 1) DNA is unzipped and the bases are used to code for a strand of mRNA. 2) mRNA strand attaches to a ribosome. 3) tRNA carries amino acids to the ribosome. 4) Amino acids are linked by peptide bonds to create protein.

------------------------------

TRANSCRIPTION

In protein synthesis, the first step is to synthesize messenger RNA, mRNA.

The transcription is the coping process of the DNA section, and it happens in the nucleus.

After that, the translation occurs when the formed mRNA moves to the cytoplasm through the nucleus membrane pores.

TRANSLATION

Once in the cytoplasm, it begins the translation process.

mRNA meets a free ribosome that is the primary structure for protein synthesis.

Ribosomes are composed of two subunits, a big one and a small one.

They also associate with different tRNA that carries amino acids.

The ribosome reads mRNA in the 5´ to 3´ direction, and, according to the codons that are being readen, tRNA transfers the correct amino acids to build the polypeptide chain.

Each tRNA has two important sites. One of them is the antidocon that couples with the codon of the mRNA molecule. The other site couples with the coded amino acid.

The new amino acid joins the growing chain through peptidic bonds between the carboxyl and amino groups.

The tRNA leaves the ribosome and is free to join another amino acid and repeat the cycle.

The protein is synthesized from the amino terminus to the carboxy terminus, while the added amino acids to the chain are coded by a codon formed by three bases in the mRNA.

The start and stop codons are used as signals of the synthesis initiation and finish. The ribosome beggins protein synthesis when reading the start codon, and when reaches the stop codon, protein synthesis is over.

According to this theoretical framework, we can order the steps.

1) DNA is unzipped and the bases are used to code for a strand of

mRNA ⇒ Transcription ⇒ Nucleus

2) mRNA strand attaches to a ribosome ⇒ Translation ⇒ Cytosol

3) tRNA carries amino acids to the ribosome and matches with the

correct codon ⇒ Translation ⇒ Cytosol

4) amino acids are linked together by peptide bonds to create protein ⇒ Translation ⇒ Cytosol.

--------------------

Related link (steps for protein synthesis) :

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brainly.com/question/14274397?referrer=searchResults

6 0

3 years ago

Please help on this one

kakasveta [241]

Answer:

Explanation:

5 0

3 years ago

This diagram represents a solid object with a mass of 120 grams. What is the density of the object?

svet-max [94.6K]

Answer:

a. 30 cm³

b. 4.33 g/cm³

Explanation:

a Volume of the object = l*w*h

l = 5 cm

w = 2 cm

h = 3 cm

Volume of object = 5*2*3 = 30 cm³

b. Density of the object = mass of the object / its volume

Mass of object = 130 grams

Volume = 30 cm³

Density of the object = $\frac{mass}{volume} = \frac{130}{30} = 4.33 g/cm^3$

4 0

3 years ago

Read the following statements about various species of plants and animals. Which one would be classified as an invasive species?

abruzzese [7]

From what we know, we can confirm that an invasive species will be the one that when introduced into an environment, reproduces at a rate that harms the biodiversity of the local ecosystem.

<h3 /><h3>What is the harm of these species to ecosystems?</h3>

Invasive species harm ecosystems greatly. Though invasive species are often rare, they cause great harm to ecosystems by affecting the biodiversity of the system and can lead to widespread extinctions of other organisms in that particular ecosystem.

Therefore, an invasive species will be the one that when introduced into an environment, reproduces at a rate that harms the biodiversity of the local ecosystem.

To learn more about ecosystems visit:

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3 0

2 years ago