You find a single-celled eukaryotic organism that has plasmids, a nucleus, 80S r

Question

You find a single-celled eukaryotic organism that has plasmids, a nucleus, 80S ribosomes, and ester-linked unbranched lipids. In what way would this be an unusual eukaryote?

Select one:

a. Plasmids are rare in eukaryotes.

b. Unbranched lipids are rare in eukaryotes.

c. Ester-linked lipids are only found in bacteria.

d. 80S ribosomes are only found in prokaryotes.

e. Eukaryotes have ether-linked lipids.

Suppose you are studying an organism with linear chromosomes, few plasmids, and membrane-enclosed organelles. Its lipids are most likely

Select one:

a. few in number.

b. unbranched.

c. ether-linked.

d. bound to proteoglycan.

e. solid at high temperatures.

Modern petroleum extracted from oceanic deposits is most likely derived from ancient

Select one:

a. foraminiferans.

b. diatoms.

c. radiolarians.

d. brown algae.

e. dinoflagellates.

Which statement concerning alternation of generations is correct?

Select one:

a. The multicellular spore-producing organism is diploid.

b. It occurs in all multicellular protists, all land plants, and some fungi.

c. Individual spores are diploid.

d. Only the haploid organism reproduces asexually.

e. The gamete-producing organism produces gametes by meiosis and cytokinesis.

Which group is least related (i.e., most distantly related) to the others?

Select one:

a. Paramecia

b. Apicomplexans

c. Dinoflagellates

d. Ciliates

e. Trypanosomes

A major difference between the vegetative states of plasmodial and cellular slime molds is that plasmodial slime molds _______, whereas cellular slime molds _______.

Select one:

a. have haploid nuclei; have diploid nuclei

b. produce fruiting bodies; do not produce fruiting bodies

c. undergo aggregation under adverse conditions; do not undergo aggregation under adverse conditions

d. exist as a coenocytic mass; exist as individual myxamoebas

e. grow almost indefinitely in favorable conditions; must aggregate into myxamoebas every seven generations

Explanation / Answer

Ques-1: You find a single-celled eukaryotic organism that has plasmids, a nucleus, 80S ribosomes, and ester-linked unbranched lipids. In what way would this be an unusual eukaryote?

Answer: a. Plasmids are rare in eukaryotes.

Reason:

Plasmid defined as extra chromosomal piece of DNA characteristically used to transfer the DNA, which looks like small, circular shaped. It can fit about genes 15-kilo base pairs. Introduced DNA template is a small, double-stranded circular piece of DNA (a plasmid) with a single origin of replication and a single replication termination site. These are rare in eukaryotes and special chromsosomes are existing in these eukaryotes. However, single celled eukaryotes such as yeast may be useful to construct "plasmids" (yeast artificial chromosome) useful for DNA recombinant technology. Therefore, it is rare in eukaryotes of multicellular origin and unusual feature in single celled eukaryotes compared to higher multicellular eukaryotes. Horizontal gene transfer takes place between bacteria by transferring plasmids and transposons to transfer both pathogenicity and antibiotic resistance properties carrying genes to non-pathogenic, antibiotic-susceptible bacteria.

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