Multiple ChoiceWhich of the following mutations, occurring just after the start codon in the mRNA is likely to have the most serious effects on the polypeptide product?1931views14rank
Multiple ChoiceA point mutation in which a single base pair is inserted or deleted from DNA is called a(n) __________. 939views
Multiple ChoiceA virus infects a cell and randomly inserts many short segments of DNA containing a stop codon throughout an organism's chromosomes. This will probably cause __________. 891views1rank
Multiple ChoiceA particular mutation had no effect on the polypeptide encoded by a gene. This mutation probably involves __________. 798views
Multiple ChoiceA single base substitution is LEAST likely to be deleterious (dangerous) when the change results in _____.312views6rank
Multiple Choice A section of DNA has this base sequence: AGCGTTACCGT. A mutation in this DNA strand results in this base sequence: AGGCGTTACCGT. What type of mutation does this change represent?344views3rank
Textbook QuestionIf a base-pair change occurs in DNA, this a. is a mutation. b. would be a mutation only if it falls in a protein-coding part of a gene. c. would be a mutation only if it falls in a transcribed part of the genome. d. is not a mutation, because only one base pair has been altered.512views
Textbook QuestionImagine discovering a loss-of-function mutation in a eukaryotic gene. You determine the gene's nucleotide sequence from the start site for transcription to the termination point of transcription and find no differences from the wild-type sequence. Explain where you think the mutation might be and how the mutation might be acting.593views
Textbook QuestionA geneticist found that a particular mutation had no effect on the polypeptide encoded by a gene. This mutation probably involved a. deletion of one nucleotide. b. alteration of the start codon. c. insertion of one nucleotide. d. substitution of one nucleotide.1062views
Textbook QuestionIf a fragment of a chromosome breaks off and then reattaches to the original chromosome but in the reverse direction, the resulting chromosomal abnormality is called a. a deletion. b. an inversion. c. a translocation. d. a nondisjunction.891views
Textbook QuestionWhich of the following describes mutations? Select True or False for each statement. T/F Point mutations can occur in any DNA sequence. T/F Frameshift mutations can occur in any DNA sequence. T/F Neutral mutations depend on the degeneracy of the genetic code. T/F Deleterious mutations occur only in protein-coding sequences of DNA.1203views
Textbook QuestionExplain what's wrong with this statement: All point mutations change the genotype and the phenotype.499views
Textbook QuestionSkin color is often one of the first traits people notice in each other. Studies in zebrafish uncovered a mutation that altered a transport protein and resulted in light-colored fish. This discovery led to the finding that the same gene in humans has a strong influence on skin pigmentation in many populations. The zebrafish mutation that reduced coloration created a null allele of the transport protein gene. Which of the following types of mutation would be most likely to create this null allele? a. a missense mutation b. a frameshift mutation c. a neutral mutation d. a silent mutation591views
Textbook QuestionA mutation in a single gene may cause a major change in the body of a fruit fly, such as an extra pair of legs or wings. Yet it probably takes the combined action of hundreds or thousands of genes to produce a wing or leg. How can a change in just one gene cause such a big change in the body?779views
Textbook QuestionA chemical called dioxin is produced as a by-product of some chemical manufacturing processes. This substance was present in Agent Orange, a defoliant sprayed on vegetation during the Vietnam War. There has been a continuing controversy over its effects on soldiers exposed to it during the war. Animal tests have suggested that dioxin can be lethal and can cause birth defects, cancer, organ damage, and immune system suppression. But its effects on humans are unclear, and even animal tests are inconclusive. Researchers have discovered that dioxin enters a cell and binds to a protein that in turn attaches to the cell's DNA. How might this mechanism help explain the variety of dioxin's effects? How might you determine whether a particular individual became ill as a result of exposure to dioxin?403views