This quiz works best with JavaScript enabled. Home > Genetics > Genetics Tree Improvement – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Genetics Tree Improvement Quiz 2 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The paramecium is a single-celled organism that reproduces asexually. The offspring of a paramecium usually contain A) Only half of the genes of the parent cells. B) More DNA than the parent cell. C) Genetic material identical to that of the parent cell. D) Fewer mutations than the parent cell. Show Answer Correct Answer: C) Genetic material identical to that of the parent cell. 2. Which of the following resulted from the invention of the microscope? A) The development of the theory of evolution. B) The development of the cell theory. C) Proof that cells can form spontaneously. D) Proof that all cells have the same basic structure. Show Answer Correct Answer: B) The development of the cell theory. 3. The potato famine in Ireland (1845-1852) occured when a fungus (P. infestans) escaped by chance out of Mexico and into North America and Europe. The fungus, which caused crop-destroying potato blight, apparently came from a single clonal genotype. The potato population was probably vulnerable to infection by this fungus because of which of the following? A) Lack of genetic drift. B) Not enough organisms. C) Lack of genetic variation. D) Balanced polymorphisms. Show Answer Correct Answer: C) Lack of genetic variation. 4. In hamsters, the gene for short hair (H) is dominant to the gene for long hair (h). Which is the most likely genotype of the parents if 4 of their 8 offspring have long hair? A) Hh X hh. B) Hh X Hh. C) HH X hh. D) Hh X hh. Show Answer Correct Answer: A) Hh X hh. 5. Evolution can occur at different rates; however, for evolution to occur, there must be A) Variations within a species. B) Extinction of the species. C) Asexual reproduction. D) No change in the genes of an organism. Show Answer Correct Answer: A) Variations within a species. 6. Which statement best describes a situation where competition occurs in an ecosystem? A) A deer outruns an attacking wolf. B) A deer, during the winter, consumes tree bark. C) A deer and a rabbit consume grass in a field. D) A deer and a rabbit are both startled by a hawk flying overhead. Show Answer Correct Answer: C) A deer and a rabbit consume grass in a field. 7. DNA replication occurs in preparation for A) Mitosis, only. B) Meiosis, only. C) Both mitosis and meiosis. D) Neither mitosis nor meiosis. Show Answer Correct Answer: C) Both mitosis and meiosis. 8. Which of the following is the beginning step of DNA replication? A) The enzyme primase starte the complementary strand of DNA with short segments of RNA. B) The process of elongation adds DNA nucleotides to each complementary strand of DNA. C) The enzyme DNA polymerase bonds to the RNA primers. D) The enzyme helicase unzips the DNA double helix. Show Answer Correct Answer: D) The enzyme helicase unzips the DNA double helix. 9. A person has high level of high-density lipoproteins (HDL). Which of the following best describes this situation? A) HDL is less dangerous to a person's system because it is able to send cholesterol to the liver for elimination. B) HDL is more dangerous to a person's system because it carries cholesterol to all the cells in the body. C) HDL levels cannot be treated because they are always the result of family inheritance. D) HDL levels can be lowered because they are always produced by poor diet and lack of exercise. Show Answer Correct Answer: A) HDL is less dangerous to a person's system because it is able to send cholesterol to the liver for elimination. 10. Which activity enables humans to produce new genetic combinations in other organisms? A) Selecting and breeding the organisms for specific traits. B) Increasing the number of enzymes available to the organisms. C) Growing organisms that reproduce asexually. D) Decreasing the amount of DNA in the diet of the organisms. Show Answer Correct Answer: A) Selecting and breeding the organisms for specific traits. 11. The plasma membrane in a eukaryotic cell mainly consists of which of the following? A) A phospholipid bilayer with proteins embedded in the layer. B) A protein bilayer with phospholipids embedded in the layers. C) A hydrophilic head and a hydrophobic tail. D) A phospholipid layer and a protein layer. Show Answer Correct Answer: A) A phospholipid bilayer with proteins embedded in the layer. 12. Which occurrence represents an example of evolution? A) Exposure to radiation reduces the rate of mutation in leaf cells. B) A mutation in a liver cell causes a person to produce an enzyme that is less efficient. C) Cells in a zygote eventually change into bone cells or skin cells. D) Some antibiotics are almost useless, because pathogens have developed a resistance to these antibiotics. Show Answer Correct Answer: D) Some antibiotics are almost useless, because pathogens have developed a resistance to these antibiotics. 13. A ring of bark down to the sapwood is completely removed from the circumference of a tree. This serves to eliminate the phloem at the level of the ring. Which of the following is the most likely effect? A) An inability to carry on photosynthesis. B) An inability to transport sugars to the plant. C) An inability to transport water to the plant. D) An inability to obtain water from the soil. Show Answer Correct Answer: B) An inability to transport sugars to the plant. 14. Plant species X lives in a hot, dry environment. Slowly, over hundreds of years, the climate becomes wetter. Fungi attack species X and cause the population of species X to decrease. However, plant species X could survive if the plants A) Try to mutate quickly and synthesize new proteins. B) Are watered often and fertilized with extra nutrients. C) Can adapt to the new conditions by mating with the fungus. D) Have a few members of the population that are fungus-resistant. Show Answer Correct Answer: D) Have a few members of the population that are fungus-resistant. 15. When an organism reproduces asexually, it usually has A) Only one parent, and half as much DNA as the parent. B) Only one parent, and the same chromosome number as the parent. C) Two parents, and twice as much DNA as either parent. D) Two parents, and the same chromosome number as each parent. Show Answer Correct Answer: B) Only one parent, and the same chromosome number as the parent. 16. Natural selection is best described as A) A change in an organism in response to a need of that organism. B) A process of nearly constant improvement that leads to an organism that is nearly perfect. C) Differences in survival rates as a result of different inherited characteristics. D) ) inheritance of characteristics acquired during the life of an organism. Show Answer Correct Answer: C) Differences in survival rates as a result of different inherited characteristics. 17. Which of the following best describes osmosis? A) The movement of water molecules out of a cell, resulting in cell shrinkage. B) The movement of small, uncharged molecules across the lipid bilayer to a state of equilibrium. C) The movement of charged molecules and larger molecules into and out of the cell. D) The movement of water molecules across the selectively permeable plasma membrane. Show Answer Correct Answer: D) The movement of water molecules across the selectively permeable plasma membrane. 18. Most animals have internal or external skeletons for structure and support. Which of the following parts provide a similar function in plant cells? A) Cytoplasm. B) Chloroplast. C) Cell membranes. D) Cell walls. Show Answer Correct Answer: D) Cell walls. 19. There is evidence that supplying a cup of sugar to certain bacteria could power a 60 watt light bulb for more than 15 hours. Which of the following is the best method to affirm this idea? A) Conducting an experiment. B) Trading observations. C) Formulating a hypothesis. D) Researching the scientific literature. Show Answer Correct Answer: A) Conducting an experiment. 20. Fossils provide evidence that A) Life on Earth millions of years ago was more complex than life is today. B) The changes that will occur in species in the future are easy to predict. C) Many species of organisms that lived long ago are now extinct. D) Most species of organisms that lived long ago are exactly the same today. Show Answer Correct Answer: C) Many species of organisms that lived long ago are now extinct. ← PreviousNext →Related QuizzesGenetics Tree Improvement Quiz 1Genetics Tree Improvement Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books