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3 years ago

Which cells are required to process and present antigens from foreign material as the initial step in the immune response?

1 answer:

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The macrophage is the cell responsible for detecting, engulfing and destroying pathogens and apoptotic cells. These cells process and present antigens (foreign materials) to immunocompetent cells and thus they are the key mediators in the development of all immune reactions.

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Costa Rica, located in Central America, features a very high level of biodiversity due to its tropical climate and large range o

maxonik [38]

Answer:

The interaction between the sloths and the leaves they eat is an example of a predator-prey relationship. In this example, sloths are herbivores that acquire their nutrients and energy from the plants they eat. The colors of coral snakes provide these animals with mimicry to avoid predation. Specifically, their coloration helps them advertise their toxicity. The interaction between the hosts and the ticks that live on them can be characterized as parasitism, because one species feeds on the other.

Explanation:

Predator-prey relationships are those in which a specie feeds on another specie. The sloth is the predator that feeds on the leaves which are its prey. Herbivores feed on plants. Therefore, the sloth are rightly classified as herbivores.

Coral snakes are brightly colored with red, yellow, and black patches that warn potential predators of their toxicity. Ticks living on hosts are parasitic because the ticks feed on their host.

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3 years ago

Endosymbiont theory explains some of the differences and similarities between prokaryotes and eukaryotes. Categorize the followi

spayn [35]

Answer:

Endosymbiont theory was proposed by Lynn Margulis in 1967 which suggested the origin of Chloroplast and mitochondria in eukaryotic cells.

The theory suggested that chloroplast and mitochondria organelle originated by engulfing the cyanobacteria and proteobacteria by other prokaryotic bacteria.

This shows that Prokaryotes exhibit the following characters:

1. These were the first organisms on Earth

2. Lack membrane-bounded

3. Aerobic bacteria are these types of cells

Eukaryotes exhibit:

1. Have mitochondria

2. Includes organisms that carry out aerobic respiration

3. Can be a multicellular organism

4. Includes organisms that are photosynthetic

5. Might have chloroplasts

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3 years ago

1. When a sugary gummy bear is placed in water, there are more dissolved solutes _______________ (inside/outside) the gummy bear

madreJ [45]

Answer:

When a sugary gummy bear is placed in water, there are more dissolved solutes inside the gummy bear.

Explanation:

The sugary gummy bear has more solutes as compared to the water in which it is being soaked. When a sugary gummy bear is placed in water, water enters the gummy bear through osmosis as water tends to move to the place where there are more solutes. The sugar gummy bear has more solutes. So, the gummy bear expands and increases in size due to the entrance of water into it.

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3 years ago

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Explain why parthenogenesis is a reproductive strategy

AlekseyPX

Obligate parthenogenesis is the process in which organisms exclusively reproduce through asexual means. Many species have been shown to transition to obligate parthenogenesis over evolutionary time.

7 0

3 years ago

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Which two examples show adaptations for plants growing in the desert?

Phantasy [73]

1. spines to protect plants against animals seeking water.

2. A waxy coating on leaves to reduce water loss.

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3 years ago