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2 years ago

A _ star has a greater temperature than a _ star

Biology

2 answers:

melamori03 [73]2 years ago

7 0

A I think that is how lightning works anyways

sattari [20]2 years ago

6 0

Answer: Option A

Explanation:

The more hot the star is the more blue it looks. The cooler stars are blue in color and temperature is approximately 11,000 Kelvin and it gives Rigel.

It contains 40,000 times the energy of the Sun. The stars are blue in color because of its surface which appears to be blue.

Whereas, the stars that are colder appears red in color. The colder stars appears to be red in color. So, the star having greater temperature appears blue and cooler star appears.

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The following statements are all true regarding amino acids and proteins. Select which statements are unique to proteins alone a

Vilka [71]

Answer:

The statement true of all proteins, carbohydrates and fats is that human body is able to synthesize them all.

The statement unique to proteins is that proteins are made up of instructions according to DNA.

Explanation:

Carbohydrates, Proteins and fats are macronutrients and required by body in larger amounts. All these macromolecules are made up of building blocks like proteins are from amino acids, carbohydrates from monosaccharides and fats from triglycerides. Human body can also synthesize these macronutrients. Like proteins can be synthesized by central dogma. Glucose can be synthesized by gluconeogenesis from glycogen and fats can be synthesized from acetyl-CoA and NADPH.

The proteins are made up by a process known as central dogma. The first step of central dogma is replication in which a replicated copy of DNA is produced in a cell. The second step is transcription for the production of messenger RNA from DNA. At last mRNA is used for the production of proteins on ribosomes.

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2 years ago

A geneticist crossed pure breeding black mice with pure breeding brown mice. All the 992 mice in F1 generation had black coats.

MaRussiya [10]

Answer:

The statements that apply are the third and the fourth.

Explanation:

Since the mice crossed were pure breeding, each parent produced sperms of one kind, both alleles of each parente were equal. Thus, the first (A) and second (B) statements are false.

Assume pure breeding black mice produced BB sperm and pure breeding brown mice produced bb sperm.

The punnett square for the first generation, F₁ is would be:

b b

B Bb Bb

This is, all the F₁ generation mice are Bb.

All the 992 in F₁ generation had black coats means black is dominant.

Now when F₁ generation is crossed, the punnet square reveals the second generation, F₂:

B b

B BB Bb

b bB bb

The brown allele that was hidden now appears.

Based on the assumption that black is dominant, BB, Bb and bB are black, which is 3/4 or 75%. This, is 75% of the mice in the F₂ genrertion are black.

The combination bb is brown. Thus, 1/4 or 25% of the mice in the F₂ generation are brown.

When the mice in the first generation were crossed, they yielded 961 black coated mice and 317 brown coated mice. That is:

Total mice: 961 + 317 = 1278

Proportion of black mice: 961 / 1278 ≈ 0.75 = 3/4

Proportion of brown mice: 317 / 1278 ≈ 0.25 = 1/4

Ratio black to brown: 3 to 1.

Therefore, it is proven that an approximately three-to-one ratio of black to brown cated mice in F₂ is accounted fro the black allele being dominant over the brown allele (choice C.)

Also, the brown allele is not independent from the black allele and dissapears in the F₁ generation: it is not independent because it presence will only be shown when the black allele is not present, and it is said that it dissapears because it is not revealed, it is hidden.

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1 year ago

A maternal effect can cause the offspring phenotype ratio to depart from that of classic Mendelian inheritance. In a species of

MArishka [77]

Answer:

A. 4 right handed coil:0, left- handed coil

Explanation:

According to MENDELION CROSS:

We will get NN, Nn,Nn,nn

NN, Nn, Nn are the 3 right handed coiling and nn is left handed coiling.

But in case of shell coiling in snails, maternal inheritance is applied in which offspring is decided only by phenotype.

Maternal traits: Here,female parent has right handed shell coiling. so, all the offsprings will have the same.

Hence, the phenotypic ratio will be:

4 Right handed coil: 0 Left handed coil

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2 years ago

There is an algal bloom in a bay in a populated area. As the leading marine biologist in the area, what is the most important th

k0ka [10]

Answer:

evacuate all wildlife from the bay

Explanation:

Algal bloom is a term used to describe the excessive growth of algae species in a water body. This excessive growth or proliferation is as a result of the exposure to nutrient in form of pollutants, a process called Eutrophication.

However, the presence of an algal bloom indicates the pollution of that water body, which will result in the degradation of the pollutants by bacteria. As bacteria acts on the pollutants in the water body, they excessively use the dissolved oxygen of the water body, hence, drastically reducing the oxygen levels of the water. This possess a great threat to aerobic wildlife in the water, which could die as a result of suffocation or anorexia.

Hence, the most important thing to do in a case of noticing an algal bloom in a bay is to evacuate all wildlife from the bay in order to prevent mass death.

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2 years ago

One of the four nucleotide bases in dna is replaced by a different base in rna. which base is it, and what is it replaced by?

andrey2020 [161]

DNA has thymine and RNA has uracil both of which pair with adenine.

Hope that helps.

4 0

2 years ago

A ___ star has a greater temperature than a ___ star

A _ star has a greater temperature than a _ star