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Chapter 28: Q28.5-2CC (page 612)

In what sense is 鈥渇ungus animal鈥� a fitting description of a slime mold? In what sense is it not fitting?

Short Answer

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Slime molds are often described as 鈥渇ungus animals鈥� because of their similarity with these two eukaryotic groups. The formation of a fruiting body for spore dispersal resembles fungi, and the ability to move and ingest food resembles animals.

The 鈥渇ungus animal鈥� description is not accurate because slime molds have a remarkable resemblance with tubulinids and entamoebas than any other eukaryotic group.

Step by step solution

01

Amoebozoans

The eukaryotic supergroup ukinota comprises seven smaller groups that are paired under two clades. Amoebozoan is the clade that contains three of the seven groups, and all are protist organisms. The presence of lobular or tube-shaped pseudopodia is one of the characteristics of amoebozoan.

02

Slime molds

The organisms categorized as slime molds are those protists members who assist in the decomposition process. Slime molds are further branched into two groups; plasmodial slime molds and cellular slime molds.

The plasmodial slime molds have a body of single cells with multiple nuclei, while the cellular slime molds have a body formed by aggregation of multiple uninucleate cells.

03

Resemblance of slime molds with other eukaryotes

Slime molds can develop fruiting bodies, which facilitate the dispersal of haploid spores is similar to fungi.The potential of these organisms to move from one region to another and their ability to ingest food is similar to animals. Thus, slime molds are often described as 鈥渇ungus animal.鈥�

The description of slime mold as a 鈥渇ungus animal鈥� is not absolute. Evolutionary studies suggest that slime molds have a closer relationship with entamoebas and tubulinids (groups under amoebozoan clade) compared with their relationship with the fungal or animal group.

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Most popular questions from this chapter

This micrograph shows a single-celled eukaryote, the ciliate Didinium(left), about to engulf its Paramecium prey, which is also a ciliate. Identify the eukaryotic supergroup to which ciliates belong and describe the role of endosymbiosis in the evolutionary history of that supergroup. Are these ciliates more closely related to all other protists than they are to plants, fungi, or animals? Explain.

Explain why forams have such a well-preserved fossil record.

Biologists think that endosymbiosis gave rise to mitochondria before plastids partly because

(A) the products of photosynthesis could not be metabolized without mitochondrial enzymes.

(B) all eukaryotes have mitochondria (or their remnants), whereas many eukaryotes do not have plastids.

(C) mitochondrial DNA is less similar to prokaryotic DNA than is plastid DNA.

(D) without mitochondrial CO2 production, photosynthesis could not occur.

MAKE CONNECTIONS Review Figures 9.2 and 10.6, and then summarize how CO2 and O2 are both used and produced by chlorarachniophytes and other aerobic algae.

The equation F = e-kt describes the fraction F of an original isotope remaining after a period of t years; the exponent is negative because it refers to a decrease over time. The constant k provides a measure of how rapidly the original isotope decays. For the decay of carbon-14 to nitrogen-14, k = 0.00012097. To find t, rearrange the equation by following these steps: (a) Take the natural logarithm of both sides of the equation: ln(F ) = ln(e-kt). Rewrite the right side of this equation by applying the following rule: ln(ex) = x ln(e). (b) Since ln(e) = 1, simplify the equation. (c) Now solve for t and write the equation in the form 鈥�t = ________.鈥�
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