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BIO 133 Exam 4- Chapters 16- 20
Part 1 of 1 - 90.0/ 100.0 Points Question 1 of 40 2.5/ 2.5 Points A donkey and a horse can mate and produce a mule. Why are they not considered to be the same species? E. the mule is sterile Feedback: Correct Question 2 of 40 2.5/ 2.5 Points Sequencing the genomes present in a biofilm is known as. B. metagenomics Feedback: Correct Question 3 of 40 2.5/ 2.5 Points Gradual speciation is more likely to be associated with small changes building up in C. stable environments Feedback: Correct
Question 4 of 40 2.5/ 2.5 Points Stabilizing selection happens when D. the intermediate phenotype of a population is more likely to survive Feedback: Correct Question 5 of 40 2.5/ 2.5 Points A gene is made up of three exons (numbered consecutively) with two introns (intron 1 between exons 1 and 2 and intron 2 between exons 2 and 3). What would happen if there were a mutation at the 3’ splice site of intron 1? D. mRNA with all three exons along with intron 1 Feedback: Correct Question 6 of 40 0.0/ 2.5 Points Bacillus thuringienesis bacteria produce a toxin that harms insects. The bacteria used to be grown in culture and sprayed on crops as an insecticide. How has genetic engineering eliminated the need to do this?
- A. engineered motility for the bacteria so they can move to the crops themselves
- B. put the toxin gene into the plants themselves to make their own toxin
- C. engineered insects to be able to use Bacillus thuringienesis as a food source
- D. put the toxin gene into humans so that they are resistant Feedback: Incorrect- Learning Objective Text: Describe uses of biotechnology in medicine and agriculture
Question 10 of 40 2.5/ 2.5 Points If every cell in the body gets the same DNA, how do the cells of an embryo make different structures and take on different roles? (Select all that apply.) A. Different transcription factors are active in different cells. C. Genes are spliced differently in different cells. D. Translation is regulated so that different cells may make more of certain proteins. Feedback: Learning Objective Text: Analyze the processes of gene expression and gene regulation Question 11 of 40 2.5/ 2.5 Points When performing gel electrophoresis, how is it possible to determine the size of the DNA fragments? C. compare to known standards also run on the gel Feedback: Correct Question 12 of 40 2.5/ 2.5 Points The place where Darwin noticed finch and tortoise differences that helped him develop his theory of evolution was? B. the Galapagos Islands Feedback: Correct Question 13 of 40 2.5/ 2.5 Points The web of life model and the ring of life model of phylogeny both rely on which mechanism? A. horizontal gene transfer Feedback: Correct
Question 14 of 40 2.5/ 2.5 Points are sequences of DNA that are associated with promoter regions and can be methylated to inactivate genes B. CpG islands Feedback: Correct Question 15 of 40 2.5/ 2.5 Points Which type of mutation would NOT be subjected to natural selection? D. neutral Feedback: Correct Question 16 of 40 2.5/ 2.5 Points can occur when newly formed species produce hybrids and the original reproductive barriers break down. A. Fusion Feedback: Correct Question 17 of 40 2.5/ 2.5 Points At a family get-together, your uncle says “I don’t believe in that evolution stuff. Scientists
2.5/ 2.5 Points What is the Hardy-Weinberg principle useful for to geneticists? C. to what degree a population is evolving for a gene Feedback: Correct Question 22 of 40 2.5/ 2.5 Points Large scale adaptations of the two-hybrid technique have allowed for determining many protein interactions at once using D. protein microarrays Feedback: Correct Question 23 of 40 2.5/ 2.5 Points What is the only way to introduce a new allele into a species? C. mutation Feedback: Correct Question 24 of 40 2.5/ 2.5 Points Which of the following accomplishes horizontal gene transfer by bacteriophage? A. transduction Feedback: Correct Question 25 of 40
2.5/ 2.5 Points Which of the following would be expected to lead to fusion of two newly formed species? Select all that apply. A. mating songs changing to sound more similar B. original separation by a river that subsequently dries up Feedback: Correct Question 26 of 40 2.5/ 2.5 Points Natural selection causes heterozygotes to increase in the population. What effect does this have on p^2 and q^2? A. it will cause them both to decrease Feedback: Correct Question 27 of 40 2.5/ 2.5 Points The turning on of a gene to make RNA and eventually protein is known as gene? A. expression Feedback: Correct Question 28 of 40 2.5/ 2.5 Points The first bird that evolved the ability to fly now had habitats never before available and soon branched out into many different species utilizing different resources, which is an example of. A. adaptive radiation Feedback: Correct Question 29 of 40 0.0/ 2.5 Points
If a promoter is found within a nucleosome, how would it be possible to express that gene if needed? C. slide the nucleosome Feedback: Learning Objective: Describe how access to DNA is controlled by histone modification Question 33 of 40 2.5/ 2.5 Points Enhancers located hundreds of bases upstream of a gene can be brought to the promoter by . B. DNA bending proteins Feedback: Correct Question 34 of 40 2.5/ 2.5 Points Population bottlenecks and founder effects D. both lead to genetic drift, which reduces variation in the population Feedback: Correct Question 35 of 40 0.0/ 2.5 Points
A species of fly lives in a canyon. Some of the flies prefer the side that gets sunlight during the day, while others prefer the shade. Over time, they develop different mutations and start to mate with those that prefer the same conditions. What would this be due to?
- A. hybrid sterility
- B. post-zygotic isolating mechanisms
- C. gametic inviability
- D. habitat preference
- E. allopolyploidy Feedback: Incorrect Learning Objective Text: Describe genetic variables that lead to speciation Question 36 of 40 2.5/ 2.5 Points During translation initiation, eIF-2 binds to GTP which then binds to B. 40S ribosomal subunit Feedback: Learning Objective: Describe how the initiation complex controls translation Question 37 of 40 2.5/ 2.5 Points Which population would be more likely to be affected by genetic drift? A. snails on an island in the Mississippi River Feedback: Correct Question 38 of 40 2.5/ 2.5 Points
