This exam is 50 multiple-choice questions and you have 105 minutes to complete it. Before starting the exam, please read the Information on Online Exams. Contact your instructor immediately if you are locked out of a test or experience problems. You can message me through Canvas or send me an e-mail (sanjiva.gunasekara@scccd.edu). Question 44 2 pts Which of the following about DNA suggests that all living things have a common ancestor. Only some living things use DNA as their genetic material Different species don't share any of the same DNA sequences Different species use a different genetic code to code for proteins all living things use the same genetic code to code for proteins
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The question asks which statement about DNA suggests that all living things have a common ancestor. This is a question about the fundamental properties of DNA and its role in evolution. Show more…
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Which of the following about DNA suggests that all living things have a common ancestor? 1. Different species use a different genetic code to code for proteins. 2. Only some living things use DNA as their genetic material. 3. All living things use the same genetic code to code for proteins. 4. Different species don't share any of the same DNA sequences.
Adi S.
All living organisms use DNA as their genetic material and share essentially the same genetic code. Which of the following gives the best scientific explanation for these shared features? All living species independently evolved the same genetic code. DNA and the genetic code were already present in the last common ancestor of all modern-day organisms. DNA sequences never change, so using DNA as the genetic material ensures that organisms have no genetic variation. DNA is the only biological molecule that can carry information.
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DNA is isolated from a deep-frozen Neanderthal corpse exposed in the Swiss Alps due to global warming (maybe). It has 12% guanine bases. What percentage of the nucleotides in this sample will be adenine? A. 6% B. 12% C. 24% D. 38% E. 76% During transcription, which RNA molecule will be made from the DNA sequence CGTTACG? A. GCATTGC B. GCAAUGC C. CGTTAGC D. CCAAUGG E. CGUUAGC Gene regulation is the production of RNA, using the information in the DNA sequence of a gene. T/F Which statement about mutations is false? A. Mutations result from natural selection. B. Mutations are random. C. Mutations can create a new allele in an individual. D. Mutations are the ultimate source of variation in a population. The wings of a bat and the wings of an insect are examples of... A. Analogous structures B. Vestigial structures C. Homologous structures D. Common structures E. None of the above A cell with 28 chromosomes undergoes meiosis, how many cells result? _____ How many chromosomes are in each resulting cell? _____ A. 2; 14 B. 4; 7 C. 4; 14 D. 2; 28 E. 4; 28 The genetic code is ambiguous because some amino acids are coded by more than one codon. The lack of redundancy in the genetic code is evidenced by the fact that each codon codes for only one amino acid. T/F
Bryan V.
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