On the evening of March 31, 2021, the Ministry of Education and Training officially announced the reference exam for the 2021 high school graduation exam for all subjects, closely following the 12th grade curriculum.
You are viewing: High School Graduation Illustrated Exam 2021 in Biology (with answers)
The illustrative exam for high school graduation in 2021, subject of Biology in the Natural Science complex, consists of 40 questions in the form of multiple choice, with a test time of 50 minutes. Through the illustrated exam 2021 with this answer, it will help them to review well, to achieve high results in the upcoming National High School Exam 2021.
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In addition, you can also refer to the full set of illustrated exam questions for high school graduation in 2021, with 9 subjects to practice the ability to solve problems quickly and accurately. Please refer to the illustrated exam questions and suggested answers for Biology in the article below.
Answers to illustrated questions in Biology 2021
| 81.A | 82. EASY | 83. EASY | 84. OLD | 85. A | 86. REMOVE | 87. REMOVE | 88. A | 89. EASY | 90. EASY |
| 91.DUC | 92. OLD | 93. A | 94. A | 95. A | 96.A | 97.A | 98.DUC | 99.C | 100. EASY |
| 101.C | 102.C | 103.DUCK | 104.A | 105.A | 106.A | 107.A | 108. EASY | 109. EASY | 110.C |
| 111. EASY | 112.A | 113.A | 114.A | 115.BELL | 116.BELL | 117. REMOVE | 118.C | 119. | 120. A |
Illustrated topic 2021 Biology subject of the Ministry of Education and Training
| #M862104ScriptRootC1420797 { min-height: 300px; }
MINISTRY OF EDUCATION & TRAINING REFERENCES QUESTIONS (Thesis has 4 pages) |
High School Graduation Exam 2021Exam: NATURAL SCIENCE Component exam: BIOLOGY Time to do the test: 50 minutes, no time to issue questions |
Question 81: In the plant body, which of the following essential mineral nutrients is a component of protein?
A. Nito. B. KIM.C. Copper. D. Kali.
Question 82: Which of the following animals breathe through a tube system?
A. Tho. B. Lizard. C. Copper frog.D. Grasshopper.
Question 83: In a cell, a timin-type nucleotide is a component of which of the following molecules?
A. rRNA.B. Protein.C. mRNA. D. DNA.
Question 84: According to the superdominant hypothesis, which of the following crosses gives the offspring the highest hybrid advantage?
A. AABB x AABB B. AAbb x aabb C. aabb x AABB D. aaBB x AABB
Question 85: In the regulation mechanism of the Lac operon in E. coli, which of the following proteins is synthesized even when there is no lactose in the environment?
A. Inhibitor protein.B. Lac AC protein. Lac Protein Y D. Lac Protein Z
Question 86: Which of the following chromosomal mutations changes the structure of chromosomes?
A. Deviation.B. Transition.C. Polyploidy.D. Polyploidy.
Question 87: Which of the following ecological factors is an abiotic factor?
A. Wormbird.B. Light.C. Worms eat rice leaves.D. Rice.
Question 88: An organism with which of the following genotypes is called homozygous for 2 pairs of genes?
A. AAbb B. AaBb C. AABb D. AaBB
Question 89: In the biome, which of the following ecological relationships belongs to the supportive relationship between species?
A. Parasite. B. Suppression – infection.C. Compete. D. Symbiosis.
Question 90: In fruit flies, consider a gene located in a non-homologous region on the X chromosome with 2 alleles, A and a. Theoretically, which of the following genotypes is incorrect?
A. XAXaB. XAYC. XaXaD. XAYA
Question 91: According to the modern theory of evolution, which of the following factors orients the evolutionary process?
A. Mating is not random. B. Mutation.C. Random elements. D. Natural Selection.
Question 92: A population of plants, consider a gene with 2 alleles, A and
A. If the frequency of allele A is 0.4, then the frequency of allele a of this population is A. 0.5. B. 0.3.C. 0.6. D. 0.4.
Question 93: Cultivating pollen grains with genotype Ab in vitro to create haploid tissues, then causing diploidization, can create genotyped plants.
A. AAbb B. AABBC. aabb D. aaBB
Question 94: According to modern theory of evolution, which of the following evolutionary factors does not change the allele frequency of a population?
A. Mating is not random. B. Mutation.C. Natural selection. D. Random factors.
Question 95: During the breeding season, the female individuals in the population compete with each other for a favorable place to nest. Here is an example of a relationship
A. competition of the same species. B. support the same species. C. fraternity. D. cooperation.
Question 96: In the history of the development of the living world through the geologic period, humans appeared in the modern world
A. Newborn. B. Protozoa.C. Middle School.D. Paleozoic.
Question 97: For a plant species, consider two pairs of chromosomes denoted A, a and B, b. Which of the following organisms is a body?
A. AaB B. AaBbC. AaBbb D. AaBB
Question 98: Which of the following is one of the basic characteristics of a population of organisms?
A. Species composition. B. Dominant species.C. Characteristic species. D. Age structure.
Question 99: Which of the following materials can be used to extract chlorophyll?
A. Turmeric. B. Ripe gac fruit.C. Verdure. D. Carrots.
Question 100: A gene that affects the expression of two or more different traits is called
A. independent assortment. B. gene linkage.C. sex affiliation.D. polygenic genes.
Question 101: A plant species has 2n = 24 chromosomes. Theoretically, the number of linked gene groups of this species is
A. 24.B. 8.C. 12.D. 6.
Question 102: According to the theory, the process of meiosis in an organism has which of the following genotypes to produce a type of gamete?
A. AaBB. B. aaBb.C. aaBB.D. AABb.
Level 103: Given the food chain: Rice plant + Worm eats rice leaves + Field frog + Cobra + Hawk. In this food chain, which organism belongs to the group of tertiary consumers?
A. Hawk. B. Copper frog. C. Worms eat rice leaves. D. Cobra.
Question 104: In the vascular system of animals, the blood velocity is greatest in
A. aorta. B. capillaries. C. arteriolysis. D. venous drainage.
Question 105: The zygote formed in which of the following cases can develop into a triploid?
A. The n gamete fuses with the n+1.B gamete. The n gamete fuses with the n-1.C gamete. The 2n gamete fuses with the 2n.D gamete. The n gamete fuses with the 2n gamete.
Question 106: Show that each gene regulates 1 trait, the dominant allele is completely dominant. Theoretically, which of the following crosses produces the offspring with the most phenotypes?
A. AaBb x AaBb B. AaBb AABb C. AaBb x AaBB D. AaBb x AAbb
Question 107: Among the modes of new species formation, species formation is different from geographical areas
A. usually proceeds slowly through many intermediate stages of transition.B. not affected by natural selection.C. found only in animals that move less.D. not involved in adaptive population formation.
Question 108: How many of the following measures help protect the environment and use natural resources sustainably?
I. Limit the use and discharge of plastic bags into the environment.
II. Increase use of non-renewable resources.
III. Establishment of nature reserves.
IV. Anti-erosion and anti-salt intrusion for soil.
A. 2. B. 4.C. 1.D. 3.
Question 109: Cross P: , get F1 . Indicates that the process of meiosis has occurred gene transposition. Theoretically, how many genotypes can F1 have?
A. 8. B. 2.C. 6.D. 4.
Question 110: In a plant species, allele A is mutated into allele a, allele b is mutated into allele B; Show that each gene determines 1 trait, the dominant allele is completely dominant. Which of the following two genotypes are called mutants?
A. Aabb, AaBbB. AAbb, AabbC. AABB, aabb D. aaBB, AAbb
Question 111: A mating population has a genotype component in the P generation of 0.64 AA : 0.27 Aa : 0.09 aa. Show that this pair of genes regulates a trait and the A allele is dominant over the . allele
A. Theoretically, how many of the following statements are true about this population?
I. Without the influence of evolutionary factors, the genotype frequencies do not change through all generations.
II. If there is an effect of natural selection, the frequency of the dominant phenotype can be altered.
III. If there is a mutation, the frequency of the A allele can be altered.
IV. If random factors are involved, the allele a can be completely eliminated from the population.
A. 2. B. 1.C. 4. D. 3.
Question 112: A food web of organisms is depicted in the figure below.
Assume that species A and species B are producers and the remaining species are consumers. Theoretically, how many of the following statements are true about this food web?
I. C, G, F, D species belong to the same trophic level.
II. If species E is completely removed from the community, the number of individuals of species F will inevitably increase.
III. This food web has 7 food chains.
IV. The number of food chains that species M participates in is equal to the number of food chains that species B participates in.
A. 2. B. 3.C. 1. D. 4.
Question 113: The D gene in prokaryotes has the following nucleotide sequence:
– Circuit without mold
– Mold making circuit
Nucleotide sequence number on the template strand
Know that the amino acid valine is encoded by only the codons: 5’GUU3, 5’GUX3, 5’GUA3, 5’GUG3; the amino acid histidine is encoded by only the codons: 5’XAU3, 5’XAX3”; Polypeptide chain synthesized by gene D has 300 amino acids. How many of the following point mutations create new alleles for polypeptide chain synthesis similar to polypeptide chains synthesized by gene D?
I. The mutation replaces the G – X pair at position 181 with the A – T pair.
II. The mutation replaces the nucleotide pair at position 150.
III. The mutation replaces the G-X pair at position 151 with an X-G pair.
IV. The mutation replaces the nucleotide pair at position 898.
A. 1. B. 3.C. 2.D. 4.
Question 114: In an animal species, the eye color trait is regulated by a gene located on the chromosome that usually has 4 alleles, the dominant allele is completely dominant. Perform the following operations
Let the brown-eyed individual in the P generation of the first cross mate with one of the two yellow-eyed individuals in the P generation of the second cross, to obtain offspring. Theoretically, a child’s life can be proportional
A. 50% brown-eyed individuals: 25% yellow-eyed individuals: 25% white-eyed individuals.B. 25% red-eyed individuals: 25% yellow-eyed individuals: 25% brown-eyed individuals: 25% white-eyed individuals.C. 100% brown-eyed individuals.D. 75% brown-eyed individuals: 25% yellow-eyed individuals.
Question 115: According to modern evolutionary theory, when talking about the process of forming new species, how many of the following statements are true?
I. Formation of new species can occur in the same geographical area or different geographical areas.
II. Inversion mutations can contribute to the creation of new species.
III. Outcrossing and polyploidy can produce new species with diploid chromosomes.
IV. The process of forming new species can be affected by random factors.
A. 3. B. 4.C. 2.D. first.
Question 116: For a plant species, consider 3 pairs of genes A, a; B, b and D, d are located on 2 pairs of chromosomes, each gene regulates 1 trait, the dominant allele is completely dominant. Crossing P: 2 plants are heterozygous with 3 pairs of genes that cross each other, yielding F1 with 12 genotypes. Theoretically, plants with 1 dominant allele in F1 account for
A. 50.00%.B. 12.50%.C. 31.25%.D. 18.75%.
Question 117: In a plant species, the allele A for red flowers is dominant over the allele a for yellow flowers; allele B for round fruit is completely dominant over allele b for long fruit; These 2 genes are on 2 pairs of chromosomes. In a population in genetic equilibrium, 27% plants have yellow flowers and round fruits; 9% plants with yellow flowers and long fruits; the rest are red-flowered, round-fruited trees and red-flowered, long-fruited trees. Theoretically, among the red-flowered, round-fruited plants of this population, the proportion of plants that are homozygous for a pair of genes is
A. 1/12. B. 5/12 C. 2/3. D. 1/2.
Question 118: Give the following pedigree chart
Show that M disease is regulated by one of the two alleles of a gene located on the autosomal chromosome; N disease is caused by one of the two alleles of a gene located in a non-homologous region on the X chromosome; Person 11 has a father and mother who do not have disease M but has a sister with disease M. Theoretically, the probability of having the first son without disease M and disease N of the pair 10 -11 is
A. 1/36. B. 7/144. C. 1/18. D. 1/144.
Question 119: In fruit flies, the allele A for gray body is dominant over allele a for black body; Allele B for long wings is dominant over allele b for penguins; These 2 pairs of genes are located on autosomes; The D allele for red eyes is completely dominant over the d allele for white eyes, this pair of genes is located in a non-homologous region on the X sex chromosome. Crossing Flies with gray body, long wings, red eyes x Gray body flies, wings long, red eyes, obtained F1 with 17.5% gray body flies, long wings, white eyes. Theoretically, in the total number of female flies with gray body, long wings, red eyes in F1, the number of non-pure flies accounts for the highest proportion.
A. 6/7. B. 4/21. C. 3/10. D. 7/20.
Question 120: A plant species, flower color is regulated by 2 pairs of genes A, a and B, b independently segregate; Plant height is determined by a gene with two alleles, D and d. Miracle P: Red-flowered tree, tall stem x Red-flowered tree, tall stem, obtained F1 with a ratio of 6 red-flowered plants, tall stem: 5 rose plants, tall stem: 1 rose plant, low stem: 1 tree white flowers, tall stems: 3 red flowers, low stems. Theoretically, the number of genotypes in F1 could be which of the following?
A. 12. B. 6.C. 30.D. 24.
Matrix of Illustrated Topics for Biology 2021
Posted by: Nguyen Dinh Chieu High School
Category: Grade 12 Materials
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