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- 6. How do you know if the halibut you purchased at thesupermarket is really halibut? To identify the sourceof a biological sample, scientists PCR amplify andthen sequence a region of DNA known to vary between species. For animals, this DNA region is a648–base pair portion of the mitochondrial cytochrome oxidase I gene. The sequence of this mtDNAregion acts as a so-called DNA barcode because adatabase exists that contains the sequences of thismtDNA region that are unique for hundreds ofthousands of animal species.a. Why do you think that a region of mitochondrialDNA is used for barcoding animals, as opposed toa region of nuclear genomic DNA?b. A single pair of PCR primers can be used tobarcode any species of fish. Explain how this ispossible.c. List criteria that scientists would have consideredwhen determining which mitochondrial DNAsequence to use for barcoding animals.The fact that we find histones in Eukarya and Archaea is most likely to indicate indicate what? O A. Histones evolved prior to Archaea and Eukarya branching off from Bacteria B. Histones evolved after Archaea and Eukarya branched off from Bacteria • C. Histones are found only in multicellular organisms • D. Histones are necessary to protect DNA from nucleases O E. Histones are a product of convergent evolution1. Why was the great oxygenation event important for mitochondrial development? a) In your own words, define symbiotic. 2. Chloroplasts and mitochondria both contain a circular DNA chromosome, and ribosomes. Why does this evidence support the theory of endosymbiosis as the mechanism for the origin of eukaryotic cells? a) Today, could mitochondria live independently of their eukaryotic cell host? Give two pieces of evidence to support your answer.
- 1. Which of the following is not an evidence that chloroplasts and mitochondria originated as prokaryotic endosymbionts of larger cells? * A. They contain circular DNA molecules not associated with proteins. B. Their membranes have enzymes and transport systems that resemble those found in plasma membranes of prokaryotes. C. Their ribosomal RNA is more similar to that of eubacteria than to eukaryotes. D. They contain their own genome and produce their own proteins. 2. Why does the endosymbiotic hypothesis maintain that chloroplasts may have at least three origins? It is because * A. Molecular systematics link the red line, green line and brown line to three different eubacteria. B. The chloroplasts of green plants show three distinct morphologies. C. The pigment composition and thylakoid arrangement cyanobacteria occur in three different arrangements. D. The phyla of algal protists can be divided into three…18-Consider the reaction: A + B → C + D+ Energy a) the reaction is endergonic b) an enzyme could further speed up the reaction c) ATP is required for the reaction to proceed d) all of these statements are correct 20-The result of convergent evolution would be that: a) bats, birds and beetles have wings that have evolved at different times in the history of life b) bats, birds and beetles do not share a common ancestor with respect to wings c) the wings evolved three times independently, on three branches of the tree of life d) all of the above are correct 21-This reaction: 6CO2 + 6 H2O converted to C6H12O6 + 6O2 a) requires chlorophyll oxidation b) is an oxidation of carbon dioxide c) converts carbon dioxide into oxygen d) takes place in the mitochondrial matrix 22-Which of these statements is false regarding metabolism in general? a) oxidation can be defined as a loss of electrons b) during photosynthesis, hydrogen atoms are transferred from sugar to O2 c) potential…select the correct options: A) For organisms that diverged >74 mya, ignore 3rd base positions within codons because they will offer little phylogenetic information for organisms. B) use different parts ofthe genome to estimate different parts of a phylogeny C) Use only 1st base positions within codons because they increase rapidly at first, then level off as result of single subsitituions at the same sites D) Use slowly evolvong sites in the squecne, such as 2nd base positions within codonsfor analyzing the oldest relationships among organisms.
- 1. The key events in life’s history given below: I. First eukaryotes II. Earliest multicellular eukaryotes III. Colonization of land by fungi, plants, and animals IV. Cambrian explosion V. First prokaryotes. Which is the correct sequence of events? a. I, V, IV, II, III b. V, II, I, III, IV c. I, V, II, III, IV d. V, I, II, IV, III 2. Why is PCR useful? a. Because it replicates all the DNA in the cell b. Because it produces a heat-tolerant DNA polymerase c. Because it occurs on an automated device d. Because it can produce large amounts of DNA from small amountsthe same as the genus of an animal that steals chloroplasts from algae. It can keep the chloroplasts alive for many months, thanks to genes that were originally part of the algae genome. What kind of animal is this? A. Luna both caterpillars, Insecta, Arthropod B. Marine Flatworm, platyhelminthes C. Sea slug, mollusk gastropod D. Bivalve, Mollusk 1895. The association of specific kinds of stomach cancer with blood type "O" is informative because a) people with blood type O have a genetic predisposition to all cancers. b) the evolution of H. pylori bacteria that can cause stomach ulcers and cancer to evolve surface proteins similar to those found on the surface of red blood cells of individuals with blood type "O". c) people with blood type "O" tend to live in areas with higher environmental contamination that causes stomach cancers. d) all of the above. e) none of the above.
- 1. Explain how genetic information in DNA provides evidence for evolution?2. What if two organisms (Ex. Horse & Monkey) have the same number of amino acid incommon from a given species/animal (Human) Cytochrome C? In situations like this,how would you decide which is more closely related to the given species or animals(Human)?(if anyone please help me with all these questions) 2. As eukaryotic cells become more specialized, the nucleus is NOT important as the site of a) DNA synthesis, b) changes in the regulation of genes, c) protein synthesis, d) the transcription of mRNA for protein synthesis, e) DNA mutation. 3. In the evolution of the eukaryotic cell, these cells have key changes that include which of the following: a) These cells reproduce by copying their DNA perfectly each generation. b) They have their DNA in the nucleoid area. c) have adapted the mesosome membrane system of the prokaryote to form a nucleus and an endoplasmic reticulum. d) each new type on new eukaryote cell has its own mesosomes e) none of these are true. 4. The evolution/development of the skeletal system found in the Deuterostomes, is made up of two molecules, Ca+2PO4-2 and collagen These molecules are produced released from by a specialized type of stem cell. Therefore, one would expect that these stem cells perform which…In a population of self-replicating RNA molecules, natural selection would favor those molecules that: a. have longer nucleotide sequences. b. have shorter nucleotide sequences. c. replicate more rapidly. d. replicate with a higher mutation frequency. e. are transported across lipid membranes.