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salantis [7]
3 years ago
15

Which of the following statement(s) is/are TRUE regarding protein secondary structures? A. Not all polypeptide sequences can ado

pt an alpha-helical structures, with A and L being strong alpha-helix formers and P and G act as alpha-helix breakers B. Beta-sheets can adopt two orientations, parallel and antiparallel, with the antiparallel Beta-sheet structures being stronger because of their ability to form linear hydrogen bonds between strands. C. If protein secondary structures were french fries, then alpha-helices would be the curly fries and the beta-sheets would be the waffle fries. D. All of the statements are true.
Biology
1 answer:
Snezhnost [94]3 years ago
6 0

Answer:

D. All of the statements are true.

Explanation:

Alpha helical secondary structure of proteins is stabilized by hydrogen bonding. The hydrogen bond is formed between a hydrogen atom attached to the electronegative N atom of the peptide bond and oxygen atom of the carboxyl group of the fourth amino acid towards the N terminal of that peptide bond. This internal hydrogen bonding makes the alpha-helices stable structures.  

The N atom of protein is a part of a rigid ring and does not permit the free rotation and does not have the H atom to participate in the internal hydrogen bonding. It rather produces a kink in the alpha helix. Glycine has one H atom as its R group and its smaller size makes the alpha helix to assume a coiled structure. Therefore, proline and glycine destabilize the alpha-helices. Alanine, leucine, lysine, etc allow the optimum hydrogen bonding of alpha helices and are frequently found in the alpha-helices. The polypeptide backbone in alpha-helices assumes a helical structure. In beta conformation, the backbone of the polypeptide is extended into the zigzag pattern line a waffle fry.  

Beta sheets are stabilized by hydrogen bonds formed between the adjacent parts of the polypeptide chains. The adjacent polypeptide chains may be present in parallel or antiparallel pattern, depending on the same or opposite orientation of amino and carboxyl groups. The antiparallel conformation has opposite amino-to-carboxyl orientations, allowing the formation of linear hydrogen bonds between the adjacent polypeptides which in turn makes these confirmations more stable.

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Which level of biological organization consists of all of the living and non livingthings in a particular area?
WARRIOR [948]

Answer:

Ecosystem

Explanation:

The ecosystem includes a total of the abiotic and biotic components of a region. These components interact with each other and make the ecosystem self-sufficient in terms of energy and nutrients. Climatic conditions, physical factors, soil type, and its feature together make the non-living or abiotic part of an ecosystem. They interact among themselves and with the living components by nutrient cycling. All the species of living beings together make the biotic components of an ecosystem. They interact with each other by food chains and food webs.

Oceans are an example of the aquatic ecosystem while deserts are terrestrial ecosystems.

3 0
3 years ago
In classical conditioning, the _____ response is the learned reaction to a previously neutral stimulus.
zimovet [89]

Answer:

conditioned response

Explanation:

The conditioned response, in classical conditioning, is the learned reaction that is elicited by an organism to a previously neutral stimulus, which is now a conditioned stimulus.

In the experiment of Pavlov, where the dog was taught to salivate by presenting food and the sound of the bell at the same time, the dog learns to salivate at the sound of bell alone even without food. This response of the dog is termed a conditioned response to a conditioned stimulus (sound of bell).

4 0
3 years ago
Maria claimed that she could not see through the safety goggles and wore them on top of her head rather than over her eyes. Whil
larisa86 [58]

Answer:

She should immediately rinse or flush her eyes with water.

Explanation:

One of the most important precautionary measure to be taken when working with explosive chemicals in the laboratory is the use of safety goggles. However, in this case, Maria claimed that she could not see through the safety goggles and wore them on top of her head rather than over her eyes.

Maria accidentally splashed some chemicals into her eyes while trying to pour it into a beaker. The primary or initial response to this happening is to immediately FLUSH OR RINSE her eyes with water. This will flush away the chemical from her eyes before it can have its detrimental effect.

8 0
3 years ago
Plants take in<br> and release oxygen gas.
Zina [86]

Answer:

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Explanation:

Carbon Dioxide is from the air and then release oxygen gas.

4 0
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Read 2 more answers
Which of the following is a sign of food spoilage?
grigory [225]

The sign that shows food spoilage is bulging or leaking cans. That is option C.

Food substances can be stored or preserved to prolong the nutritive values and shelf life of the food.

Food spoilage occurs when environmental factors such as:

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  • oxygen,
  • heat,
  • humidity,
  • temperature and
  • spoilage bacteria

causes food to become unsuitable for consumption.

For canned products, bulging or leaking cans shows the food content has deteriorated.

This shows some ongoing fermentation by a spoilage bacteria causing the can to bulge and eventually leak out.

Therefore, the sign that shows food spoilage is bulging or leaking cans.

Learn more about food here:

brainly.com/question/25884013

7 0
2 years ago
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