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What are trực tiếp bóng đá euro hôm nay Top 04 1st-semester question papersand answers for 9th-grade Biology?
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1st-semester question papersand answers for9th-grade Biolog
1. A gene on a double-stranded DNA has 120 helical turns. How many nucleotides does this gene have?
a. 3600
b. 1200
c. 120
d. 2400
2. Let A, T, G, X be trực tiếp bóng đá euro hôm nay respective amounts of corresponding nucleotides on a double-stranded DNA molecule. According to trực tiếp bóng đá euro hôm nay complementary principle, which expression below is correct?
a. A + T = G + X
b. A/X = G/T
c. X + T = A + G
d. X - G = A + T
3. Which mutation below does not change trực tiếp bóng đá euro hôm nay number of nucleotide types in trực tiếp bóng đá euro hôm nay gene?
a. Adding one pair of A - T
b. Replacing A – T pair with G - X pair
c. Losing one pair of G - X
d. Losing one pair of A – T and adding 2 pairs of G - X
4. Which method can help us determine trực tiếp bóng đá euro hôm nay role of trực tiếp bóng đá euro hôm nay environment and genotype in trực tiếp bóng đá euro hôm nay formation of traits?
a. Reciprocal cross
b. Pedigree analysis
c. Inducing artificial mutations
d. Study of identical twins
5. Which of trực tiếp bóng đá euro hôm nay following traits is dominant in humans?
a. Long eyelashes
b. Straight nose
c. Even teeth
d. All of trực tiếp bóng đá euro hôm nay above options are correct
6. What role does a hormone play?
a. Carries genes, determines trực tiếp bóng đá euro hôm nay physical and chemical properties in trực tiếp bóng đá euro hôm nay cell.
b. Structures trực tiếp bóng đá euro hôm nay organelles within trực tiếp bóng đá euro hôm nay cell.
c. Catalyzes trực tiếp bóng đá euro hôm nay metabolic processes in trực tiếp bóng đá euro hôm nay cell and body.
d. Regulates trực tiếp bóng đá euro hôm nay metabolic processes in trực tiếp bóng đá euro hôm nay cell and body.
7. A chromosome has trực tiếp bóng đá euro hôm nay gene sequence XYZT. After mutation, trực tiếp bóng đá euro hôm nay chromosome has trực tiếp bóng đá euro hôm nay gene sequence: XYZTZT. What type of mutation is this?
a. Gene mutation
b. Chromosome fragment duplication
c. Chromosome fragment inversion
d. Chromosome fragment deletion
8. Chromosomes exist singly in which type of cell?
a. Primitive germ cell
b. Somatic cell
c. Gamete
d. Mature germ cell
9. What is trực tiếp bóng đá euro hôm nay primary cause of structural chromosome mutations?
a. Change in light intensity
b. Sudden change in trực tiếp bóng đá euro hôm nay living environment
c. Effects of physical and chemical agents from trực tiếp bóng đá euro hôm nay environment
d. Intracellular physiological changes
10. Genes and proteins are linked through an intermediary molecule, what is it?
a. tRNA
b. mRNA
c. rRNA
d. Ribosome
B. Essay
1. Compare and contrast mitosis and meiosis (4 points)
2. trực tiếp bóng đá euro hôm nay codon sequence of a gene segment is as follows:
…– T – A – X – G – T – T – A – G – X – …
This gene segment undergoes a mutation. Write trực tiếp bóng đá euro hôm nay mRNA strand aggregated from this gene segment in trực tiếp bóng đá euro hôm nay case where trực tiếp bóng đá euro hôm nay gene segment loses a nucleotide pair at trực tiếp bóng đá euro hôm nay third position from trực tiếp bóng đá euro hôm nay left in trực tiếp bóng đá euro hôm nay sequence under review. (1 point)
3. Why are gene mutations often harmful to trực tiếp bóng đá euro hôm nay organism itself? (1 point)
Answers
A. Multiple Choice
-
d. 2400 (Each helical turn on double-stranded DNA has 20 nucleotides. Thus, this gene has: 20.120 = 2400 nucleotides)
-
c. X + T = A + G (since A links with T and vice versa, trực tiếp bóng đá euro hôm nay number of A = T, similarly, trực tiếp bóng đá euro hôm nay number of G = X, so X + T = A + G)
-
b. Replacing A – T pair with G - X pair (replacement thus does not change trực tiếp bóng đá euro hôm nay quantity)
-
d. Study of identical twins (Since twins have identical genotypes, if any traits differ due to living in different conditions, it indicates that trait is greatly influenced by trực tiếp bóng đá euro hôm nay environment and vice versa)
-
a. Long eyelashes
-
d. Regulates trực tiếp bóng đá euro hôm nay metabolic processes in trực tiếp bóng đá euro hôm nay cell and body.
-
b. Chromosome fragment duplication
-
c. Gamete (carries half trực tiếp bóng đá euro hôm nay chromosomes of trực tiếp bóng đá euro hôm nay mature germ cell (2n) thus having a haploid set of chromosomes (n) meaning trực tiếp bóng đá euro hôm nay chromosomes exist singly)
-
c. Effects of physical and chemical agents from trực tiếp bóng đá euro hôm nay environment
-
b. mRNA
B. Essay
1. Compare and contrast mitosis and meiosis
A. Similarities:
- Both are processes of cell division involving spindles: Chromosomes divide first, followed by cytoplasmic division (0.25 points)
- Both go through 4 phases: prophase, metaphase, anaphase, telophase, with similar sequences regarding chromosome status and movement through phases (especially mitosis and meiosis 2) (0.25 points)
B. Differences:
| Comparison Criteria | Mitosis | Meiosis |
| Type of cells where it occurs | Primitive germ cells and somatic cells | Mature germ cells (0.5 points) |
| Number of DNA replications | 1 time | 2 times (0.25 points) |
| Number of cell divisions | 1 time | 2 times (0.25 points) |
| Sequence | - Metaphase: Chromosomes align in a single row at trực tiếp bóng đá euro hôm nay equatorial plane of trực tiếp bóng đá euro hôm nay spindle - Anaphase: From double chromosomes split into single chromosomes, each moving to an opposite pole of trực tiếp bóng đá euro hôm nay cell - Telophase: Division of cytoplasm forming daughter cells that retain trực tiếp bóng đá euro hôm nay diploid chromosome set 2n in a single state |
- Metaphase 1: Double chromosomes align in two rows at trực tiếp bóng đá euro hôm nay equatorial plane (0.5 points) - Anaphase 1: Each double chromosome in homologous pairs moves towards one pole of trực tiếp bóng đá euro hôm nay cell (0.5 points) - Telophase 1: Division of cytoplasm creating daughter cells with a haploid chromosome set n in a double state (0.5 points) |
| Result | From one parent cell, two daughter cells are created with trực tiếp bóng đá euro hôm nay same chromosome set as trực tiếp bóng đá euro hôm nay parent (2n) | From one parent cell (2n), four daughter cells are generated, each with a haploid chromosome set (n) (0.5 points) |
| Significance | Helps maintain trực tiếp bóng đá euro hôm nay characteristic chromosome set of trực tiếp bóng đá euro hôm nay species across cell and organism generations | Along with fertilization, helps maintain trực tiếp bóng đá euro hôm nay species' chromosome set across organism generations in sexually reproducing organisms (0.5 points) |
2. trực tiếp bóng đá euro hôm nay codon sequence of a gene segment is as follows:
…– T – A – X – G – T – T – A – G – X – …
After mutation processing, losing a nucleotide pair at trực tiếp bóng đá euro hôm nay third position, trực tiếp bóng đá euro hôm nay sequence will be:
…– T – A– G – T – T – A – G – X – … (0.5 points)
trực tiếp bóng đá euro hôm nay mRNA synthesis follows trực tiếp bóng đá euro hôm nay complementary principle: A pairs with U, G pairs with C, C pairs with G, and T pairs with A. trực tiếp bóng đá euro hôm nay mRNA sequence will be:
…– A – U– X – A – A – U – G – X – … (0.5 points)
- Gene mutations expressed in trực tiếp bóng đá euro hôm nay phenotype are generally harmful to trực tiếp bóng đá euro hôm nay organism itself because they disrupt trực tiếp bóng đá euro hôm nay harmonious unity in a genotype long-maintained through natural selection and cause disturbances in protein synthesis (which determines organism traits) (1 point)
*Note: Informationis for reference only./.
What are trực tiếp bóng đá euro hôm nay Top 04 1st-semester question papers and answers for 9th-grade Biology? What are trực tiếp bóng đá euro hôm nay rights of 9th-grade students in Vietnam when studying Biology? (Image from trực tiếp bóng đá euro hôm nay Internet)
What are trực tiếp bóng đá euro hôm nay rights of 9th-grade students in Vietnam when studying Biology?
Under Article 35 of trực tiếp bóng đá euro hôm nay Charter of Lower Secondary Schools, Upper Secondary Schools, and Multi-level Schools issued along withCircular 32/2020/TT-BGDDT, trực tiếp bóng đá euro hôm nay rights of 9th-grade students when studying Biology are as follows:
- Receive comprehensive education with fairness, be provided with time, facilities, hygiene and safety to learn in class and self-learn at home, be informed of their education and training, and be able to use learning, cultural and sport equipment of their schools as per trực tiếp bóng đá euro hôm nay law.
- Receive respect, protection and fair and democratic treatment, complain to their schools and education authorities about decisions concerning themselves; transfer school with legitimate reason as per existing regulations; enter school before trực tiếp bóng đá euro hôm nay compulsory starting age, skip a grade and study at an age higher than trực tiếp bóng đá euro hôm nay compulsory attendance age according to regulations in Article 33 ofCircular 32/2020/TT-BGDDT.
- Participate in activities for development of their gifts in academic subjects, sports and art organized by their schools if able to.
- Students eligible for social benefits, disadvantaged students and gifted students may receive sponsorship or other benefits as per trực tiếp bóng đá euro hôm nay law.
- Transfer school if eligible according to regulations following school transfer procedures stipulated by trực tiếp bóng đá euro hôm nay Minister of Education and Training.
- Enjoy other rights as per trực tiếp bóng đá euro hôm nay law.
What are trực tiếp bóng đá euro hôm nay goals ofeducation for9th-grade Biology in Vietnam?
Pursuant to Article 2 of trực tiếp bóng đá euro hôm nayEducation Law 2019, trực tiếp bóng đá euro hôm nay goals ofeducation for 9th-grade Biologyare as follows:
trực tiếp bóng đá euro hôm nay goals of education are to educate trực tiếp bóng đá euro hôm nay Vietnamese into comprehensively developed persons who possess ethics, knowledge, education, physical health, aesthetic sense and profession; to shape and cultivate one's dignity, civic qualifications and competence; to nurture one’s patriotism, national spirit, loyalty to trực tiếp bóng đá euro hôm nay ideology of national independence and socialism; to develop potentials, creativity of each individual; to improve trực tiếp bóng đá euro hôm nay people’s knowledge and manpower, to foster talents, satisfying trực tiếp bóng đá euro hôm nay demands of trực tiếp bóng đá euro hôm nay construction and defense of trực tiếp bóng đá euro hôm nay Fatherland and international integration.
