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Chapter 28: Q28.1-3CC (page 597)

After studying Figure 28.3, predict how many distinct genomes are contained within the cell of a chlorarachniophyte. Explain.

Short Answer

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Chlorarachniophytes are organisms belonging to the domain Eukarya and phylum Cercozoa. They are a group of marine algae. They are evolved from heterotrophic eukaryotes. They contain four distinct DNA inside their cell.

Step by step solution

01

Algae

Algae are organisms that lack many structures, such as roots, stems, and leaves. They can perform photosynthesis due to the presence of chlorophyll in their cell. Some of the examples are Chlorarachniophytes (marine algae) and diatoms.

02

Genetic material

The term genetic material indicates the material stored inside the cell's nucleus that helps transfer traits from parents to offspring. DNA and RNA are considered the genetic material of living organisms.

03

Number of the genome in chlorarachniophytes

Chlorarachniophytes are organisms that ingest bacteria and small protists for their survival.They belong to class Chlorarachniophyceae and subphylum Filosa. They contain genetic material inside their cell.

The first genome (DNA) is located inside the nucleus of Chlorarachniophytes. The second genome is located inside the nucleus of green algae. The mitochondria and chloroplast also contain DNA in their structure.

So third and fourth genomes are located in mitochondria, and chloroplast is located in chlorarachniophyte.

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Most popular questions from this chapter

Would you expect the plastid DNA of photosynthetic dinoflagellates, diatoms, and golden algae to be more similar to the nuclear DNA of plants (domain Eukarya) or to the chromosomal DNA of cyanobacteria (domain Bacteria)? Explain.

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�

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.

Justify the claim that photosynthetic protists are among the biosphere鈥檚 most important organisms.

Applying the 鈥淚f 鈥� then鈥� logic of deductive reasoning (see Concept 1.3), what are a few of the predictions that arise from the hypothesis that plants evolved from green algae? Put another way, how could you test this hypothesis?
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