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Paladinen [302]
3 years ago
5

Select the FALSE statement about the function of antibodies. A. Antibodies may bind to and block specific sites on viruses or ba

cteria thereby neutralizing the pathogen's effects. B. Antibodies may cause the formation of cross linked antigen-antibody complexes resulting in agglutination. C. Antibodies directly destroy antigen-bearing invaders by releasing potent toxins. D. The main antibody defense is triggering complement fixation.
Biology
1 answer:
Maslowich3 years ago
8 0

Answer:

C. Antibodies directly destroy antigen-bearing invaders by releasing potent toxins.

Explanation:

An antibody is part of the host cell defense and it’s made by B-cells (white blood cell).  The structure of the antibody consists of two light chains and two heavy chains, and at the very tip of the antibody is a hyper variable region, which is the antigen binding site that recognizes lots of different types of antigens.  An antigen is anything that is foreign to the human body (the body does not recognize it as self), it can be a virus, bacteria,  fungi, some foods and particles like dust that cause allergies and in some cases your own body will appear as foreign.

Antibodies act like small keys looking for the perfect lock, once they find their target they alert the immune system to mount a full immune response.  Using this binding mechanism, an antibody can tag a microbe or an infected cell for attack by the immune system or it can neutralize its target directly for example, by blocking a part of a microbe needed for entering and invading a cell.  Depending on the antigen the antibody binding may impede the biological process causing the disease or may activate macrophages to destroy the foreign substance, it does not release potent toxins.  Antibody binding can cause the clumping (agglutination) of large particles (viruses, bacteria etc.) making it a large complex, making phagocytosis more efficient (as they eliminate lots of clumped up viruses or bacteria in one go, and not one by one).

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A quantity that has both magnitude and direction is called a scalar quantity.
Maurinko [17]

Answer:

B - False

Explanation:

8 0
3 years ago
What environmental worldview is seen by critics as focused on short-term economic benefits with little regard for long term harm
attashe74 [19]
I believe the answer is the global free-market approach.
It is because on continually increasing use of earth's natural capital, and it focuses on short term economic benefits with little regard for degradation and depletion of natural capital and resulting long-term harmful environmental, health, and social consequences. Environmental world views are the ways of thinking about how the world work and beliefs that people hold about their roles in the natural world, another factor is widespread lack of understanding of how earth's life-support system works, keeps us alive, and supports economies. 
6 0
4 years ago
Many genes are involved in coat color and coat patterns in cats. The autosomal Dominant white (Wd ) allele results in pure-white
dsp73

Answer: The parents of the white cat would be a dominant white cat and a recessive colored coat cat.  The parents of the autosomal tabby would be a dominant tabby and either a recessive brown cat, striped cat, or a recessive black cat.

Explanation:

The genotypes and phenotypes would be : WW- Dominant white and ww- recessive color coat cat; their offspring would be 100% recessive white kittens

TT- dominant tabby and a recessive brown cat; their children would be 100%- dominant brown tabby

TT- dominant tabby and a recessive striped cat; children would be 100%- brown striped

TT- dominant tabby and a recessive black cat; children would be 100%- tabby kittens

3 0
3 years ago
DNA samples should be stored in an airtight containers to prevent contamination true or false
Aleksandr-060686 [28]

Answer: True

Explanation:

DNA is a biological evidence. It is a heredity material which is present in all organisms on earth. The DNA in humans can be taken as sample from nails, bones, blood, skin, hair and other sources.

The DNA samples can be taken so as to establish the identity of the culprit, victim or any one which is associated with crime.

The DNA evidence has applicability as a potent evidence in the court of law. Thus utmost care should be taken to preserve it's integrity until it is analysed and presented in the court of law.

Thus the DNA evidence should be collected and preserved in airtight containers so as to prevent the entry of airborne pathogens like bacteria, virus these can contaminate the sample evidence and can make the evidence not of any use.

 

7 0
4 years ago
Conventionally pasteurized milk is sterile.<br> a. True<br> b. False
spin [16.1K]

Answer: False

Explanation:

Conventionally pasteurized milk is not sterile it gets sterile after it is homogenized. The process of pasteurization involves sudden heating and sudden cowling of milk which does not kills all the microorganism but is intended to kill some of the bacteria and inactivates some enzyme.

Homogenization is a completely separate process  which involve mechanical breakdown of fat molecules in the milk which increases the shelf life of milk by preventing the cream from rising at the top.

Hence, the given statement is False.

6 0
4 years ago
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