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Micro Organisms problems

1. Which of the following is not true for eukaryotic cells?
Options
A. Nucleus is bounded by nuclear membrane
B. Chromosomes contain histones
C. Chloroplasts and mitochondria contains 70S ribosomes
D. Gas vacuoles are present

2. Eukaryotic cell organelles first emerged
Options
A. from a specialized lineage of cells within the kingdom Protista
B. when prokaryotes engulfed each other and became interdependent
C. when bacteria made their first attempts at reproduction
D. just before the origin of the animal and fungal kingdoms

3. The membranes of which domains are chemically the most similar?
Options
A. Archaea and Bacteria
B. Bacteria and Eukarya
C. Eukarya and Archaea
D. membranes of all three domains are chemically identical

4. Which of the following is a characteristic unique to the ciliates?
Options
A. Use of cilia as a sensory function
B. Presence of both a macronucleus and several micronuclei
C. Both (a) and (b)
D. Possess a light-detecting eye spot

5. Cell theory includes all of the following except
Options
A. all organisms are composed of one or more cells
B. the cell is the most primitive form of life
C. the cell is the structural unit of life
D. cells arise by division of preexisting cells

6. Which of the following may account for the small size of the cells?
Options
A. The rate of diffusion
B. The surface area/volume ratio
C. The number of mRNAs that can be produced by the nucleus
D. All of the above

9. Which of the following sequences has helped in identifying eukaryotes, eubacteria and archeabacterial cell types?
Options
A. Signature sequence
B. Signal sequence
C. Shine-Dalgarno sequence
D. Amino acid sequence

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