Answer:
D.) polygenic inheritance.
Explanation:
Polygenic inheritance is a mode of inheritance wherein the single genetic trait is regulated by more than one gene. Here, the final phenotype of the individual depends on the sum total of the dominant alleles of all the genes involved in the regulation of that trait.
In the given example, a couple of mixed ancestries might have different genes in their genome for skin color. A combination of alleles of these genes in the progeny would produce new skin color which is not present in the parents. For example, a child with all the recessive alleles of the genes for melanin production would have very light skin color while a child with more dominant alleles would have darker skin.
B.
vessels
C. companion cells
Answer: The correct answer is- C) Companion cells.
Phloem tissue is a complex conducting tissue that is present in the vascular plants and responsible for the transport of organic compound such as carbohydrates and proteins from leaves to the rest part of the plant.
The various components of phloem tissue are- Sieve element, Companion cells, phloem parenchyma, phloem fiber.
Companion cells are specialized cells ( present in association of sieve element) that perform various metabolic reactions and responsible for cellular activities. They help in loading and unloading of carbohydrate into sieve element.
immune system and are why vaccines work.
Answer:
True.
Explanation:
Memory cells and antibodies are indeed essential components of the acquired immune system, and they play a crucial role in the effectiveness of vaccines. Memory cells are specialized immune cells that "remember" previous encounters with pathogens. When the body is exposed to the same pathogen again, memory cells facilitate a quicker and stronger immune response, leading to faster clearance of the infection. Antibodies, on the other hand, are proteins produced by the immune system in response to foreign substances (antigens), such as those present in pathogens. Antibodies help neutralize or eliminate the pathogens, preventing the infection from spreading.
Vaccines work by stimulating the immune system to produce memory cells and antibodies against a specific pathogen without causing the actual disease. This prepares the immune system to respond rapidly and effectively if the person is exposed to the actual pathogen in the future.
True. Memory cells and antibodies are essential parts of the acquired immune system and are why vaccines work.
The acquired immune system is a complex defense mechanism that protects the body from pathogens. It consists of specialized cells and molecules that work together to recognize and eliminate foreign invaders. Two essential components of the acquired immune system are memory cells and antibodies.
Memory cells are a type of white blood cell that are formed after an initial exposure to a pathogen. They 'remember' the pathogen and allow for a faster and more effective immune response upon subsequent exposures. When the body encounters the same pathogen again, memory cells quickly recognize it and initiate a targeted immune response, preventing the pathogen from causing a full-blown infection.
Antibodies, also known as immunoglobulins, are proteins produced by the immune system in response to the presence of a specific pathogen. They bind to the pathogen and help neutralize or eliminate it from the body. Antibodies can recognize and bind to specific molecules on the surface of pathogens, marking them for destruction by other immune cells or neutralizing their harmful effects.
Vaccines work by stimulating the production of memory cells and antibodies without causing the full-blown disease. They contain weakened or inactivated forms of pathogens or specific components of pathogens. When a vaccine is administered, the immune system recognizes these components as foreign and mounts an immune response, producing memory cells and antibodies specific to the pathogen. This provides immunity against the pathogen, so if the person is later exposed to the actual pathogen, their immune system can respond rapidly and effectively, preventing or reducing the severity of the infection.
Learn more about memory cells, antibodies, and the acquired immune system here:
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b. catalase :________
c. cytochrome P-450 :________
d. glycosyl transferases :________
e. acid hydrolases :________
f. turgor pressure :________
g. N-linked glycosylation :________
1. Rough endoplasmic
2. Reticulum
3. Peroxisomes
4. Plant vacuole
5. Lysosome
6. Smooth
7. Endoplasmic
8. Reticulum
9. Mitochondria
10. Golgi
a) Drug detoxification ---- SMOOTH ENDOPLASMIC RETICULUM
b) Catalase ---- PEROXISOMES
c) Cytochrome p-450 ----- MITOCHONDRIA AND ENDOPLASMIC RETICULUM
d) Glycosyl Transferases ---- GOLGI APPARATUS SBD ENDOPLASMIC RETICULUM
e) Acid hydrolases ---- LYSOSOMES
f) Turgor pressure ---- PLANT VACOULE
g) N-linked glycosylation ----ENDOPLASMIC RETICULUM