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3 years ago

7

Elements can combine to form molecules, like O2 or CO2. Elements combine to form molecules and these elements are joined togethe

r by
A) chemical bonds.
B) nuclear energy.
C) sharing nuclei.
D) attractive forces.

2 answers:

Bad White [126]3 years ago

7 0

D) attractive forces

timofeeve [1]3 years ago

3 0

Its option A. Don't listen to the person under me

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A synthetic 20 amino acid polypeptide named Betanova was designed as a small soluble molecule that would theoretically form stab

ra1l [238]

Answer:

The β-Turns in this sequence are two and include the Glycine (G), the two anterior amino acids, and the one posterior amino acid.

You will find the molecule image in the attached file.

Explanation:

β-Turns are structural elements that intervene in the orientation of the polypeptide backbone. These are short sequences of amino acids, with a characteristic conformation, that imposes a sharp 180º turn on the polypeptide chain. They are very abundant in globular proteins, such as Betanova, connecting the two adjacent antiparallel segments of the sheet.

They are mostly composed of four amino acids. In most cases, the third amino acid is usually Glycine, and in other cases, the second amino acid is Proline. In any case, the first residue of the sequence forms a hydrogen bridge with the last residue of the sequence, linking the amide-group of the last amino acid with the carbonyl-group of the first amino acid in the sequence.

According to the given sequence of the protein, we can find two specific regions in the molecule that contains glycine (G). Proline is not present in Betanova. Following the theory, in most turns, Gly seems to be the third amino acid of the short sequence. So, we can assume that the first two amino acids that are located before the G and the amino acid located after the G, are the ones that compose the β-Turns.

RGWSV<u>QN</u><u>G</u><u>K</u>YT<u>NN</u><u>G</u><u>K</u>TTEGR

The first turn (QNGK) turns the direction of the polypeptide 180º, going forward to the opposite side.
The second turn (NNGK) turns again the direction of the polypeptide, driving the last strain to the other side.

In the attached image, you will find the structure of Betanova showing strands (black arrows) and turns (red arrows).

4 0

3 years ago

Please help me. I been stuck on this question for a long time :(

ki77a [65]

Answer:

Explanation:

1. Climate change is caused by changes in the earth's atmosphere in the amounts of greenhouse gases released into the air. Some scientists believe that 100% of global warming is due to humans. The largest contribution comes from burning fossil fuels because it releases carbon dioxide gas to the air, which is done by humans. Other factors that contribute to climate change include:

>Deforestation- clearing out trees affects wildlife, ecosystems, whether patterns. Forests cover 30% of the lands mass and clearing them leaves many animals without homes.

>Waste from factories- they release tonnes of toxic fumes into the air.

> Agriculture and farming- this is a surprising contributing factor to global warming. Animals produce a greenhouse gas called methane and when livestock are grazed at a large scale, the amount of methane produced is a big contributor to global warming.

Some fertilizers release nitrous oxide, which is another greenhouse gas.

2. The effects of global warming include:

>Melting glaciers- this leaves many animals without homes and it also causes a rise in sea levels which causes flooding. (that's 3 effects)

>Worsening droughts- this leaves many humans to die as they have no food or water.

>Increasing tornadoes

okay that's all i could do... hope it helps.

5 0

3 years ago

Perumbeti A, Higashimoto T, Urbinati F, et al. A novel human gamma-globin gene vector for genetic correction of sickle cell anem

elena-s [515]

SCA is a common monogenic blood disorder with potentially devastating consequences due to chronic and episodic disease; it has a massive impact on the health-care system and is linked to a significant reduction in life span.

We show that gene therapy with a lentivirus vector expressing γ-globin has the potential for a one-time cure and define the parameters required to cure the disease. We also show a preclinical in vivo method for determining the minimal amount of genetically corrected hematopoietic stem cells needed to correct disease, which is important in the design of clinical gene therapy trials.

The expression of the γ-globin gene in hematopoietic stem cells (HSCs) results in enough postnatal fetal hemoglobin (HbF) to correct sickle cell anemia (SCA) in the Berkeley "humanized" sickle mouse. We assessed critical parameters for correction after de-escalating the number of transduced HSCs in transplant recipients using reduced-intensity conditioning and varying gene transfer efficiency and vector copy number.

The minimal amount of HbF, F cells, HbF/F-cell, and gene-modified HSCs required for correcting the sickle phenotype was determined using a systematic quantification of functional and hematologic red blood cell (RBC) indices, organ pathology, and life span.

To learn more about sickle cell anemic from the given link

brainly.com/question/17063471

#SPJ4

5 0

2 years ago

PlS HELP 30 POINTS FOR BRAINLIEST!!!!!!!!!!!!!!!!!!

olga_2 [115]

Answer:

It's a little difficult to see the difference between the finch 1 and finch 2 population lines, but their trends should match those of the food. This answer is assuming the finch 1 population aligns with the seeds line and the finch two population lines up with the fruit line: <u>The finch 1 population has a beak adapted to eating seeds and the finch 2 population has a beak better adapted to eating fruit</u>

Explanation:

Since we are given data for both the food source and the finch population, the answer will most likely reflect that. Therefore eliminating choices A (disease) and C (feathers). Again, this answer is assuming the finch 1 population aligns with the seeds line and the finch two population lines up with the fruit line. The lines for the finch population will match with the availability of food, so less seeds mean less finch 1 and when the amount of seeds rise up you can see the population of finch 1 also rises.

3 0

3 years ago

1. Plant hormones include the following

Sergio039 [100]

A. Insulin as it is a human hormone produced in the pancreas to the liver....

Hope this helps ya

7 0

3 years ago

Read 2 more answers