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harina [27]
3 years ago
10

Differentiate between primary, secondary, tertiary, and quaternary structures of proteins.

Biology
1 answer:
Wittaler [7]3 years ago
4 0

Answer:

Biologists describe the structure of protein at four levels: Primary, secondary, tertiary and quaternary.

Explanation:

1. Primary structure: It is the sequence of amino acids in the polypeptide chain. It only gives us the positional information of amino acids within a protein like which one is first, which one is second and so on. We can see only peptide bonds in primary structure.

Also the first amino acid is known as N-terminal and the last as C-terminal.

2. Secondary structure: The protein thread folds either in the form of helix or beta pleated sheet to form the secondary structure.

In alpha helix, there is hydrogen bonding between every fourth amino acid. Example keratin protein of hair.

In beta pleated sheets, two or more polypeptide strands are held together by intermolecular hydrogen bonding.

3. Tertiary structure: The long polypeptide chain usually folds upon itself like a hollow wollen ball. This is termed as tertiary structure. Involves several linkages like hydrogen bond, hydrophobic bond, ionic bond, covalent bond, van der walls forces. Active sites are formed and protein gains functionality. Example: myoglobin

4. Quaternary structure: Quaternary structure is formed when there are more than one polypeptide chains. For example: hemoglobin has four helical polypeptide chains.

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Which of the following statements about the nuclear envelope is false?
GalinKa [24]

Answer:

The statement that is false is b)The nuclear envelope is continuous with the Golgi apparatus.

Explanation:

The nuclear envelope or nuclear membrane is not continuous with the Golgi apparatus; rather it is continuous with the exterior of the endoplasmic reticulum.  

Nuclear envelope is a double-layered membrane built from lipid bilayer. The nuclear membrane consists of nuclear pores, which are made up of proteins and majorly function in the passing of selected substances in and out of the nucleus. Hence, all the other statements a,c,d are correct.            

3 0
3 years ago
2.<br> When would a recessive trait be seen<br> in an organism?
IgorC [24]

<em>Answer:</em>

<em>Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait. One example of a recessive inherited trait is a smooth chin, as opposed to a dominant cleft chin. </em>

<em />

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6 0
2 years ago
What was most likely not present in the creating of amino acids
Bumek [7]
Hydrogen  
I hope this helps you!
4 0
3 years ago
In the practice of ________, scabs from smallpox victims were used to immunize susceptible individuals against smallpox.
Andreas93 [3]

Answer: Variolation

Explanation:

Variolation can be defined as the condition in which the inocolutaion of the individuals with the infectious materials, scabs or pulses from the smallpox victim.

This was introduced by the route of nasal passage or injected intravenously. The infection that developed because of this was less than normal and it provided protein against more serious disease.

Hence, the correct answer is Variolation.

4 0
3 years ago
Arrange the events of gene conversion of wild-type allele r to mutant allele r during meiotic recombination.
Phantasy [73]
I found the whole exercise on the internet. Here are the events mentioned:
"-<span>Mismatched bases in the heteroduplex trigger mismatch repair.
-Gaps in the R (wild-type) allele sequence are filled by copying the r (mutant) allele.
-A heteroduplex is formed between </span>R (wild-type) and r (mutant) alleles.
-Mismatched bases are excised from the R (wild-type) allele.
-The wild-type R allele is converted to the mutant r allele."

The correct order is:
1. Gaps in the R (wild-type) allele sequence are filled by copying the r (mutant) allele.
2. A heteroduplex is formed between R (wild-type) and r (mutant) alleles.
3. Mismatched bases in the heteroduplex trigger mismatch repair.
4. Mismatched bases are excised from the R (wild-type) allele.
5. The wild-type R allele is converted to the mutant r allele.
5 0
3 years ago
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