24. If you were to examine limestone deposits throughout the world, which group

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24. If you were to examine limestone deposits throughout the world, which group of organisms would you expect to find in the greatest abundance? A. Radiolarians B. Dinoflagellates C. Foraminiferans D. Heliozoans E. None of the above 25. Fossil prokaryotes resemble modern rod-shaped bacteria. What appears to be a first step in evolution of the modern eukaryote cell from a prokaryote ancestor? A. Formation of a nuclear envelope B. Endosymbiosis resulting in acquisition of a mitochondrion. C. Loss of the stiff cell wall of prokaryotes. D. Development of organelles studded with ribosomes . E. Endosymbiosis resulting in acquisition of a chloroplast 26. A clone is: A. a group of diverse haploid organisms. B. produced through conjugation C. nearly identical individuals created by asexual reproduction. D. formed when gametes fuse E. an organism with two types of nuclei: macronucleus and micronucleus 27. Which of the following is NOT a characteristic of a Eukaryotic Cell? A. At least two genomes present. B. Endo membrane system. C. Nuclear membrane present. D. Cell Wall present. E. 9+2 flagella/cilia with microtubules and dynein 28. Which of the following is a character that is not consistent with the bacterial origin of mitochondria? A. About the same size as Bacteria. B. Mitochondria duplicate by binary fission. C. Have their own genome which is organized as circular molecules. D. Have their own ribosomes and make their own proteins. E. All of these characters are consistent with the bacterial origin of mitochondria 29. Sex may have evolved for all of the following reasons but one: A. It allows beneficial mutations to spread B. It removes deleterious mutations from the species. C. Causes genetic changes in the organism faster than pathogens can adjust. D. Promotes the retention of optimal gene combinations 30. According to the three-domain concept of cellular life forms , Archaea is the sister group to the A. bacteria B. bacteria and eukaryotes C. eukaryotes D. prokaryotes E. protists 31. Which of the following below do not represent a clade: A. Aonly. B. A and B D.D only E. All of these are clades C. C and D

Explanation / Answer

24) (C) Foraminiferans

25) (B) Endosymbiosis resulting in acquisition of mitochondrium

(E) Endosymbiosis resulting in acquisition of chloroplast

26) A clone is: (C) Nearly identical individuals created by asexual reproduction

27) ( B) Endomembrane system

28) (E) all of these characters consistent with bacterial origin of mitochondria

29) (C) Causes genetic changes in organism faster than pathogen can adjust

30) (A) Bacteria

31) (B) A and B

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