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2 years ago

What is the best way to avoid bacterial contamination? food handling

2 answers:

7 0

The best way to avoid bacteria during food handling is wash your hands and clean surfaces before starting. Harmful bacteria can spread throughout the kitchen and get onto cutting boards, utensils, and counter tops. To prevent this: Wash hands with soap and hot water before and after handling food.

Volgvan2 years ago

7 0

Using sanataition and sterilization on any surface touched by a substance that could be contaminated, for example, if you are chopping onions wipe clean your surface wipe clean your knife peel and rinse the onion and wash your hands. and if being cooked, high temp for sanitation

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Comparing amino acid sequences in proteins has been used to determine the relatedness of organisms. Below is a graphic that show

Tju [1.3M]

Answer:

A) Species A and E are more closely related than either species are related to species D.

B) Between A and B = 99.1%

Between species A and C =97.5%

Between species B and C = 97.3%

Similarity in amino acids sequence reflects similarity in DNA sequence

C) Species A and E are most closely related

D) Species A and E have the most similarity in amino acid sequence, and hence DNA sequence.

Explanation:

A) The amino acid sequences of the protein, keratin, in species A and D has a difference of about 19 whereas species A and E have a difference of only 1. Therefore, it means that keratin in species A and D will have differences in structure whereas between species A and E, they would have almost the same structure.

Also, species D and E have a difference of 20 in their amino acids sequence, therefore, the structure of keratin in both species will have differences in structure.

B) Similarity between A and B:

450 - 4 = 446

In percentage: 446/450 × 100% = 99.1%

Similarity between A and C:

450 - 11 = 439

In percentage: 439/450 × 100% = 97.5%

Similarity between B and C:

450 -12 = 438

In percentage: 438/450 × 100% = 97.3%

The sequence of DNA of species determines their amino acid sequences because information in DNA is transcribed to RNA which are then used to make proteins. Therefore, if a species are very closely related, they are expected to have very similar genetic sequences and thus proteins too. This is reflected in similarity between amino acid sequences in their proteins.

C). Species A and E are most closely related.

D) Species A and E have only a single difference in their amino acids sequence for Keratin. This translates to about 99.7% similarity which is the highest among all the species compared. Therefore, species A and E are most closely related.

7 0

2 years ago

Which one of the following is NOT an example of microbial antagonism?

snow_lady [41]

Answer:

e. bacteria producing vitamin K

Explanation:

Microbial antagonism basically refers as microbes versus microbes i-e the indigenous microflora serve a beneficial role by preventing other microbes from becoming established in or colonizing a particular anatomic location in the body.

As all the options mentioned, refers to the microbial antagonism except option E as the normal microbes protect the host by :

1) Producing acids.

2) Bactreocin production

3) By occupying the niches that the pathogens may occupy.

But the microbes cant compete with other microbes by producing vitamins and growth factors that can be utilized by the host.

Hence option E is the right answer.

7 0

2 years ago

Triglycerides vary with respect to the number of ...

KIM [24]

Triglycerides vary with respect to the number of - C atoms and double bonds in the tails.

Triglycerides are esters derived from glycerol and three fatty acids. These are the main constituents of body fat in humans and other animals, as well as vegetable fat. There are two main types of triglycerides - saturated and unsaturated.

6 0

3 years ago

What animal eats meat? A)chicken B)sheep c)cow D)rabbit

Salsk061 [2.6K]

Answer:

There is no logical answer to this question.

Explanation:

The only one that it could be is that a chicken might eat meat if offered it and that cows have been witnessed eating birds before.

7 0

2 years ago

Read 2 more answers

Humoral immunity involves ________ cells and ___________

jarptica [38.1K]

Answer:

Humoral immunity involves B cells and recognize antigens or pathogens in the lymph or blood.

Explanation:

Humoral immunity is defined as the immunity which is mediated by several macromolecules presnet in the extracellular fluids such as antibodies, certain antimicrobial peptides, and complement proteins.

Humoral immunity allows to distinguishes two groups of foreign substances. it involves B cells and recognize antigens or pathogens in the lymph or blood.

Humoral immunity begins when an antigens bind to B cells. Interleukins or helper T cells provides a secondary signal to the B cells that activates a B cell and allows B cell proliferation. which roduces produce plasma cells. The plasma cell then produces antibodies which are identical to the specific antigen. The antibodies are the released and circulate through the body, binding to antigens. B cells the further produces memory cellss for future immunity.

So, Humoral immunity involves B cells and recognize antigens or pathogens in the lymph or blood.

8 0

3 years ago