A few high school biology questions, a few high school biology multiple choice questions

I'm here to join in the fun

It is recommended that you give the score to the white who dances AIQ.

34 I also have objections, should choose D,

Remember, the multiplication of base numbers is always equal to 1.

Except for 34 of the answers to the white of the dancing AIQ, there should be no problem, and 34 questions are either wrong or B

aaacbbc

Theoretically, it should be!

I think it's baabcdc that should be fine.

1.Option B, this question is about cyanobacteria, which have phycocyanin and chlorophyll inside and can carry out photosynthesis, but because there are no other organelles except ribosomes, they are prokaryotes.

2.Option D, all living things have nucleic acids, including viruses, but viruses only have one nucleic acid, either DNA or RNA. There are only five constituent elements of nucleic acids: C, H, O, N, and P.

Nucleic acids are divided into two types: DNA and RNA, the former is the basic unit of deoxynucleotides, and the latter is ribonucleotides.

3 D, only higher plant mature cells in a high concentration of solution will occur plasmo-wall separation. Prokaryotic cells have only ribosomes, an organelle, so aerobic respiration is not possible (the main site of aerobic respiration is mitochondria). When a person's red blood cells mature, the nucleus and numerous organelles degenerate, so they can no longer synthesize proteins.

Nitrifying bacteria are prokaryotes but perform aerobic respiration.

It used to be strong.,Now I really forgot hi.。。。

Prokaryotes, although they do not have mitochondria, can also undergo aerobic respiration. For example, cyanobacteria.

Grafting is a method of propagation that takes advantage of the regenerative power of plants. During grafting, the cambium layers of the two wounded surfaces are brought close together and tied together, and as a result, due to cell proliferation, they heal each other and become a whole connected by vascular tissue.

Therefore, the grafting process does not involve the activity of genes.

In other words, the AA buds are grafted onto AA and grow by transporting water and nutrients through vascular bundles. His genotype is still AA.

So three generations of inbred, the genotype remains the same, and it is still AA.

aa。This is because the shoots and flowers that bloom on this bud are all AA. Therefore, for three consecutive generations of inbred, the genotype of the offspring is AA.

A A Because grafting only uses the nutrients and water uploaded by AA, it will definitely not change the genetic material of AA.

So AA's descendants can only remain AA.

So the genetic factor is AA

Because it is grafted, the genotype of the bud does not change, and the plant AA actually acts as a nutrient provider for the bud AA. And because it is a bud AA self-breeding, the homozygous will not have trait separation, no matter how many generations it has been crossed, the gene is AA.