A few simple biology questions, some simple biology questions

1.False, the three stop codons do not have a corresponding amino acid.

2.False, speciation requires reproductive isolation, and biological evolution does not have to be isolated.

3.Wrong, not only the location should be close, but also the functional impact.

4.False, it is possible that the gene of interest is separated from the host chromosome set when it is replicated, which means that the binding is not necessarily strong.

5.It can be done in a short period of time, as long as there is a certain amount of CO2, water and light.

1.Some codons correspond to "ends"!

I just read and know this.

1 End codon.

2 Geographic isolation is not, reproductive isolation is.

3 alleles are such as a, a, if a, a or a, a is either (it seems to be true in college)4 does not necessarily mean stable inheritance.

Probably not.

The carrier can be plasmids and small circular DNA, animal and plant viruses, etc., not necessarily RNA, and the carrier does not need to be stably inherited in vivo, but should be the target gene in the host cell, which has nothing to do with the carrier.

There is an abort codon, which does not correspond to amino acids.

Geographical isolation leads to reproductive isolation, and reproductive isolation is a necessary condition.

The third one is right,

End codon.

Geo-isolation. Wrong.

Not necessarily. No.

1 End codon.

2. Reproductive isolation.

3 Not true. 4 Not necessarily.

5. Photosynthesis is not possible.

1. Transport RNA

2. Biological evolution.

3 Non-homologous chromosomes.

4. The carrier is RNA cannot.

Reason: The most fundamental genetic material of living organisms is DNA, which is transcribed into messenger RNA, and RNA is translated into proteins to form organisms. )

Proteins are made up of amino acids, the main chemical elements of amino acids are carbon, nitrogen, oxygen, and the main chemical elements of nucleic acids are carbon and nitrogen).

Cellulose plays a supportive role in cells).

Question 1: a

After the hind toe is peeled, the sensation on the ** is damaged, and the most basic receptor of the solid reflex arc is gone, and the reflex arc cannot be generated.

Question 2: A can feel pain, which means that there is no problem with the receptors and afferent nerves, but the question obviously mentions that the lumbar spine is injured, causing leg movement disorders, so it is obviously not the effector that is the problem, then the answer must be the efferent nerve or nerve center!

c, plasmid. Bacillus anthracis is a prokaryotic organism without mitochondria and nucleus, and plasmid is a circular DNA molecule in the prokaryotic cell that still has a genetic effect in addition to the nuclear region, since the destruction of DNA in the nuclear region does not affect the production of endotoxin, it means that the gene that produces endotoxin is located on the plasmid, and the destruction of the plasmid can prevent the production of endotoxin, so C is chosen.

Option D, the nucleus is the place where genetic material is stored, replicated and transcribed, and destroying it is equivalent to destroying genes so that it can fundamentally no longer produce endotoxin.

And the ribosome is destroyed, and it can also be transcribed through the nucleus to form ribosomal RNA, which enters the cytoplasm to form ribosomes.

It should be the d nucleus.

Mitochondria are mainly donors of ATP.

The cell membrane can exchange substances with the internal environment to support and protect the cell.

Plasmids are of no particular use.

But the nucleus provides all the genetic material, including the DNA, so ...

Plasmid C is a circular DNA molecule that has the ability to replicate and is able to direct protein synthesis.

As a result, the bacteria lose their membrane potential, cannot maintain normal osmotic pressure, and die.