Bioscience II Exam 2

6 Questions | By Ekanye | Updated: Mar 18, 2022 | Attempts: 79

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1.

Here is a picture of a marsupial mole from Australia (top) and the etherian North American mole. The striking resemblance between the two (an elongated body, enlarged front paws, small eyes and a pad of thickened skin that protects a tapered nose)
- A.
  
  Suggests that they are closely related phylogenetically
- B.
  
  Can be explained because continental drifting has subdivided one species into two
- C.
  
  Suggests that they are genetically very similar
- D.
  
  Two of the above are correct
- E.
  
  None of the above is reasonable
Correct Answer
E. None of the above is reasonable
2.

An 85% or better is required for an A in this course. Imagine a student who has received a 74% on EXAM I, a 90% on Exam II, an 83% on Exam III, and a 90% on iClicker questions. Which of the following is the lowest grade that a student needs to receive on the final to get an A in the course?
- A.
  
  78%
- B.
  
  80%
- C.
  
  81%
- D.
  
  82%
- E.
  
  83%
Correct Answer
D. 82%
3.

The major groupings of life, including the taxa within the prokaryotes and eukaryotes, seem to share a single common ancestor from which these various taxa diverged. From the time of their divergence from this "last universal common ancestor", each major taxon has followed its own, independent evolutionary history-distinctive histories that have resulted in the major taxa which we how see on earth as well as those taxa that are now extinct.
- A.
  
  Evidence in support of this includes the appearance of photosynthetic organisms in only one prokaryotic lineage and in plants.
- B.
  
  Evidence in support of this includes newly discovered fossils
- C.
  
  Evidence in support of this includes evidence of gene transfer from mitochondria to plastids
- D.
  
  Evidence in support of this includes secondary endosymbiosis where diplomonads have incorportated actinopods
- E.
  
  This statements is incorrect. There does not appear to be a single ancestor common to the three "domain" of organism. Within the community of primitive cells that gave rise to the three
Correct Answer
E. This statements is incorrect. There does not appear to be a single ancestor common to the three "domain" of organism. Within the community of primitive cells that gave rise to the three
4.

Which of the following is NOT true?
- A.
  
  Fossils that date to 2.5 billion years old include prokaryotes, and eukaryotes including multicellular orgasnism
- B.
  
  Limestone deposits called stromatolites, accumulated by cyanobacteria, are known as fossils and are still being formed today
- C.
  
  Cells with a nucleus predate cells with mitochondria
- D.
  
  The first photosynthetic organisms on earth must have been prokaryotes
- E.
  
  The Burgess Shale is known for its fossil demonstration of the Cambrian Explosion
Correct Answer
A. Fossils that date to 2.5 billion years old include prokaryotes, and eukaryotes including multicellular orgasnism
5.

Which of the following is NOT true of cyanobacteria?
- A.
  
  They are representatives of the Archaea
- B.
  
  There is genetic evidence supporting the theory that today's cyanobacteria are similar to the ancestors of choloroplasts
- C.
  
  They are photosynthetic
- D.
  
  Their metabolism results in the production of molecular oxygen from water
- E.
  
  They are photoautotrophs
Correct Answer
A. They are representatives of the Archaea
6.

Which of the following is true:
- A.
  
  Since proteinaceous enzymes are necessary to synthesize RNA and DNA, proteinaceous enzymes must have been present on peribiotic earth prior to the appearance of an information-bearing molecule
- B.
  
  Since DNA codes for enzymes, and enzymes are essential for cells to function, DNA must have been the first information-bearing molecule used by early life forms
- C.
  
  That RNA can act as a catalyst may help explain how relatively complex organic molecules could form on prebiotic earth in the absence of enzymes
- D.
  
  Since RNA is the information-bearing molecule that is translated into the amino acid sequence of enzymes, RNA must have predated the appearance of molecules having enzymatic activity on prebiotic earth.
Correct Answer
C. That RNA can act as a catalyst may help explain how relatively complex organic molecules could form on prebiotic earth in the absence of enzymes

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Current Version
Mar 18, 2022

Quiz Edited by
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Mar 24, 2010

Quiz Created by
Ekanye

Bioscience II Exam 2

Here is a picture of a marsupial mole from Australia (top) and the etherian North American mole. The striking resemblance between the two (an elongated body, enlarged front paws, small eyes and a pad of thickened skin that protects a tapered nose)

An 85% or better is required for an A in this course. Imagine a student who has received a 74% on EXAM I, a 90% on Exam II, an 83% on Exam III, and a 90% on iClicker questions. Which of the following is the lowest grade that a student needs to receive on the final to get an A in the course?

Which of the following is NOT true?

Which of the following is NOT true of cyanobacteria?

Which of the following is true: