1. In addition to the factors of time, location and people, the key to Mendel's success lies in his choice of the most suitable experimental material pea. If peas were not chosen as experimental materials, Mendel might not have discovered the first and second laws of genetics until his death.
A. correct
B. mistakes
Correct answer: a
2. Pea is a strict self-pollinating plant, which ensures the purity of the next generation of plants and avoids the uncertainty caused by natural hybridization.
A. correct
B. mistakes
Correct answer: a
3. The contents of segregation phenomenon in Mendel's genetic law include: ()
A. In the state of heterozygosity, two genetic factors can remain relatively independent, free from pollution and mixed with each other.
The combination of male and female gametes with relative traits is also non-selective, random and free.
C. After gametes are formed, they are separated and assigned to different gametes as they are, thus forming new zygotes.
In the new zygote, the original genetic factors can remain unchanged.
Correct answer: In the state of heterozygosity, two genetic factors can remain relatively independent, free from pollution and mixed with each other. # When gametes are formed, they are separated and assigned to different gametes as they are, thus forming a new zygote. # In the new zygote, the original genetic factors can remain the same.
4. At the beginning of1866, he finished this paper (), with many examples, novel ideas and rigorous argumentation. In the autumn of the same year, Mendel's paper was published in Bolen's Journal of Natural History and Natural History Society.
A. Plant hybridization experiment
B. Plant genetic experiments
C. "pea hybridization test"
D. pea genetic test
Correct answer: plant hybridization test
5. Mendel's success is mainly due to abandoning the previous chaotic calculation method, but choosing 7 pairs of characters from more than a dozen characters, and analyzing each pair of characters separately, without considering the influence of other characters, adopting single factor analysis method.
A. correct
B. mistakes
Correct answer: a
1, scientists who won the Nobel Prize for studying prions include:
A. Creutzfeldt
B. Jacob
C. Gadasek
D. prusena
Correct answer: Gajdusek Prusena.
2.Gajdusek clearly pointed out that human Creutzfeldt-Jakob disease, similar to scrapie and kuru disease, belongs to spongiform encephalopathy and is caused by the same pathogen in protein. In order to distinguish it from nucleic acid virus, he named this protein as the pathogenic factor prion. And put forward the pathogenicity of prion? Protein conformational pathogenic hypothesis? .
A. correct
B. mistakes
Correct answer: b
3、? Protein conformational pathogenic hypothesis? It is believed that prion proteins have two conformations: cellular type, also known as normal type (PrPc), and pruritic type, also known as pathogenic type (PrPsc). Pathogenic type can stress normal type into pathogenic type, realize self-replication and produce pathological effect; Gene mutation can lead to cell types? The spiral structure is unstable and spontaneously transforms when it reaches a certain amount. The lamellae increase and eventually become pathogens.
A. correct
B. mistakes
Correct answer: a
4. Prusena, a professor of neurology, virology and biochemistry at the University of California, San Francisco, set out to study the pathogen of sheep itch. The experimental animal he used was ().
A. goldfish
B. goats
C. monkeys
D. hamster
Correct answer: hamster
5, the following pathogenic factors belong to prions, including ()
A. Roitz's Felt-Jacob disease
B. kuru disease
C. mink encephalopathy
D. sheep itch