Ask a biology expert a question. I m going to ask about biology

First of all, to correct the point that bananas are strictly seeded.

a。Bananas are a green flowering plant that, like other green flowering plants, also produces flowers. So, why are there no seeds in the bananas we commonly eat?

This is because the bananas we eat now have been improved after a long period of artificial selection and cultivation. People pass through the original wild banana has very hard seeds, which is extremely inconvenient to eat. Long-term cultivation and selection have caused wild bananas to mutate, and there are no seeds in the fruit.

In fact, strictly speaking, bananas today are not without seeds. If you look closely, the rows of brown dots inside the banana are the degraded seeds.

b。Due to the degradation of banana seeds, people often reproduce their offspring through the root tillers and young shoots under the banana, which is asexual reproduction.

c。As for potatoes, they are propagated with tubers and belong to vegetative reproduction.

The seeds of the banana are in the pulp. If you look closely, there is a ribbon of several small black dots in the banana flesh, and that is the banana seed.

Potatoes themselves are tubers that sprout when buried in the soil and when the environment is suitable.

Bananas can be propagated by tissue culture.

Potatoes belong to the category called vegetative reproduction (if I'm not mistaken, it's in the biology book of the third year of high school) to reproduce, the four ways of reproduction in nature, so plants are not just grown from seeds.

Aren't bananas from early trees?

Tissue culture.

The potato is called vegetative propagation.

Summary. Hello, I have seen your question and am sorting out the answer, please wait a moment Oh I want to consult a biology question.

Hello, I have seen your question and am sorting out the answer, please wait a while How to do the second question.

Analytical expository questions.

Is it still there. In.

First of all, mammalian red blood cells are mature red blood cells by default, and they must be organelles such as non-chondria.

Secondly, actinomycetes certainly do not have mitochondria, which are unique to eukaryotes, but they have substances such as cytochromease and succinate dehydrogenase that are required for aerobic respiration. It has the same function as mitochondria.

Biology is just a relatively general knowledge Many of the contents of high school and college are different, and the content of different textbooks is also different, for example, some books say that actinomycetes are bacteria, and some books are separated.

Don't be obsessed with the topic, learn to be critical, learn something, it's a family's words, there are masters who want to guide.

Mature red blood cells do not have mitochondria, and red blood cells generally only have a lifespan of 120 days, which is relatively short.

In humans and other mammals, mature red blood cells are nucleated. This means that they have lost their DNA. Red blood cells also do not have mitochondria, they synthesize energy from glucose.

Mature mammalian erythrocytes are biconcave disc-shaped, which increases their surface area and makes it easier for substances to pass through their cell membranes.

Yes, landlord, your suspicions are correct.

I used this reference back then, but in the first edition. The landlord should use the second version. This reference is great for the first round of review and can enhance the memory of the basics.

In the book, there will be some wrong answers. I had a lot of them back then.

Landlord, you are right: actinomycetes are prokaryotic and have no mitochondria.

As for red blood cells, if not specifically stated, they generally refer to mature red blood cells. Don't pick the words too hard.

Immature red blood cells, which do have mitochondria in them.

There are still some mitochondria in the young immature red blood cells, reticulocytes, and through their secretion, a reticulocyte will form a reticular structure; If you use special staining, you can stain these reticulated structures, so these cells are called reticuocyte. After a series of differentiation, these bone marrow cells will begin to produce heme, so that the red blood cells have heme, but their nucleus and mitochondria and other structures will also disappear, and after differentiation and maturity, the red blood cells will leave the bone marrow and enter the circulatory system to perform their functions. Under normal circumstances, only mature red blood cells (which have completely lost their ribosomes) leave the bone marrow and enter the blood circulation.

But if red blood cells are not properly produced in large quantities, many reticulospheres can be found in the blood.

I wish the landlord a smooth entrance examination!