What is the smallest change in DNA that can cause disease
DNA does not contribute to disease directly. Genes are responsible for almost every disease. ChaCha. [ Source: http://www.chacha.com/question/what-is-the-smallest-change-in-dna-that-can-cause-disease ]
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- What is the smallest change in DNA that can cause disease
- DNA does not contribute to disease directly. Genes are responsible for almost every disease. ChaCha.
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- Little Biology Homework help please?
- Q: A. Sickle-cell Anemia is a disease caused by a mutation in the gene that codes for hemoglobin (the protein in red blood cells that carries oxygen). The bad allele (sickle cell gene) has just a single DNA nucleotide that is different from what the normal hemoglobin gene has – one nucleotide has been exchanged for a different one. Use your knowledge of mutation, transcription, protein synthesis, and protein structure and function to explain how such a small change can cause a deadly disease in eight different points.
- A: Ok, I’m assuming that you have learned about point mutations and frameshift (deletion/insertion) mutations at least a little bit. What you’re dealing with here is a point mutation, meaning that one teeny tiny little DNA letter has been changed (say, for example, a guanine has been changed to an adenine). Let’s assume that the normal, non-mutated section of DNA that we’re dealing with here goes like this: AAT GCALet’s say that the mutated version says this instead: TAT GCA. See what I’m getting at here? Now that you’ve got your normal DNA and your mutated DNA, figure out the mRNA sequences that are going to come from your DNA. Once you know your mRNA, you can figure out your amino acids which will be different for your normal and mutated DNA.Hope that helps!
- biology test help???????
- Q: Please help me with this biology test! Please no fake answers,i really need help with this. 10pts who help me!3. A type of chromosome change that involves reversing a fragment of the original chromosome isA. a duplication.B. a deletion.C. an inversion.D.a translocation.4. Down syndrome is also known as Trisomy 21 because people haveA. two copies of chromosome 21.B.one copy of chromosome 21.C.four copies of chromosome 21.D. three copies of chromosome 21.5. During which phase is nondisjunction likely to occur?A. ProphaseB. MetaphaseC. AnaphaseD. Telophase7. Identifying genes will aid inA. diagnosing common ailments.B. treating common ailments.C. preventing common ailments.D. all of the above.8. Lethan dominant alleles are less common than lethan recessive alleles becauseA. lethan recessive alleles usually have a large effect on carriers.B. most people with dominant disorders die before producing offspring.C. lethan dominant alleles cannot be caused by a natural mutation.D. none of the above.Small proteins that the DNA are wrapped around are called…A. enzymes.B. histones.C. DNA polymerase.D. helicase.The event in which homologous chromosomes or sister chromatids fail to separate during meiosis is calledA. nondisjunction.B. duplication.C. deletion.D. translocation.. The sex-linked allele for colorblindness is located onA. chromosome 21.B. the X chromosome only.C. the Y chromosome only.D. both the X chromosome and the Y chromosomeWhat type of effect would you expect large deletions to have on the body?A. Little to no effect.B. Some effect.C. Serious effect.13. Which of the following is caused by a dominant allele?A. Huntington’s diseaseB. albinismC. cystic fibrosisD.none of the above14. Which of the following statements is NOT true?A.A person with Huntington’s disease might not pass the allele for the disease to his or her offspring.B. A person with Huntington’s disease might be homozyous for the disease.C. Huntington’s disease is caused by a recessive allele.D. A person who inherits one allele for Huntington’s disease will develop the disease.15. Which of the following would you be least likely to see in a pedigree?A. All of the symbols are unshaded.B. All of the symbols are shaded.C. All of the symbols are half-shaded.D. About half of the symbols are circles.16. A pedigree showing the inheritance of Huntington’s disease within a family WOULD NOT show any half-shaded symbols.A. TrueB. False17. In a pedigree for a recessive trait, if a mother is represented by a shaded circle and a father is represented by a shaded square, their children cannot be represented by HALF-SHADED circles or squares.A. TrueB. False18. Two parents who have Huntington’s disease MAY produce an offspring who does not have Huntington’s disease.A. TrueB. False19. Cancer occurs from a single mutation.A. TrueB. False20. Tumor-suppressor genes make proteins called growth factors.A. TrueB. False21. Growth factors are proteins that initiate cell division.A. TrueB. False22. Cancer can be inherited.A. TrueB. False23. Cancer is a genetic disease.A. TrueB. False24. If an individual inherits a mutated tumor-suppressor gene (i.e. BRCA1) they will DEFINITELY develop cancer.A. TrueB. False25. If a person develops skin cancer they do NOT have to worry about passing it to their offspring because the mutations are in the skin cells not in the gametes.A. TrueB. False
- A: 3) C. inversion4) D. three copies5) D. Telophase.. i think. nondisjunction is failure to separate during meiosis I or II, telophase is the last part of cell division7) A. diagnosing, you can’t necessarily treat something based off the gene8) D. i don’t believe there is a reason for that one.9) A. almost all enzymes are proteins, C and D are both proteins, B has nothing to do with it.10) A. nondisjunction11) B. X chromosome12)C. large deletions can alter the whole order of the genes which can change the amino acids being made13) A. huntingtons disease14) B. homozygous means both are the same, they will obviously have the disease if both jeans are positive.15)A. that would mean everyone is homozygous for that trait, very infrequent16)B17)B18)A19)B i think this is false, not positive though20)A i think this is true.21)A22)A23)B???24)B25)i think B, but it depends, certain cancers are genetic.These questions are difficult because it can be both ways.hope this helps
- please answer?
- Q: 6. In what way can DNA segments be changed such that genes are altered or mutated?I. New DNA segments can be inserted.II. New DNA segments can be substituted.III. DNA segments can be deleted. II and III only I and II only I, II, and III I only 7. A virus is a nonliving particle, even though it is capable of invading and destroying living organisms. Which of the following is one reason that a virus is not considered living? Viruses can only reproduce through fission. Viruses only metabolize inorganic minerals. Viruses are too small to be considered a viable form of life. Viruses are not able to grow. 8. Pathogenic bacteria often cause diseases by metabolizing their host. How does a bacterium metabolize its host? The bacterium takes over control of macrophages and uses them to consume host cells. The bacterium ingests the intercellular fluid, desiccating the cells. The bacterium uses its pili to tear apart and consume host cells. The bacterium secretes enzymes that break down organic structures. Session Complete
- A: 6. I II and III7. Viruses are not able to grow8. The bacterium secretes enzymes that break down organic structures