Question 1

Which statement about eukaryotic phytoplankton is false?

Accepted Answer

Eukaryotic phytoplankton do not constitute a single clade; they are a diverse group of organisms that include multiple lineages.

Question 2

Some algae demonstrate the phenomenon of alternation of generations,by which a multicellular,diploid,spore-producing organism gives rise to a multicellular,haploid,gamete-producing organism.Which statement about alternation of generations is false?

Accepted Answer

Both the haploid and diploid organisms may reproduce asexually in alternation of generations. For example, the diploid sporophyte of some algae may undergo fragmentation to produce a new diploid organism. Similarly, the haploid gametophyte of some algae may produce new haploid organisms asexually through fragmentation or budding.

Question 3

The red tides that can kill tons of fish are caused by toxic species of _______.

Accepted Answer

The answer of The red tides that can kill tons...

Question 4

A eukaryotic organism that undergoes alternation of generations in which different generations do not resemble each other morphologically is referred to as

Accepted Answer

Heteromorphic refers to the occurrence of two distinct forms or generations in the life cycle of an organism, which differ morphologically from each other. Homomorphic means that the generations are morphologically identical, isomorphic means that the generations are similar in form but not necessarily identical, anisomorphic means that the life cycle contains different stages but with no clear alternation of generations, and gametophytic refers specifically to a life cycle in which the gamete-producing stage is dominant.

Question 5

Which photosynthetic protist performs approximately one-fifth of the photosynthetic carbon fixation on the planet (the equivalent of the entire rainforest)?

Accepted Answer

Diatoms are responsible for about 20% of the global photosynthetic carbon fixation, similar to the contribution of the entire rainforest.

Question 6

The condition of different organisms living together,one inside the other,is called _______.

Accepted Answer

The answer of The condition of different organisms living together,one...

Question 7

Which statement about the process of conjugation in paramecia is true?

Accepted Answer

E  Conjugation in paramecia involves the exchange of genetic material between two cells, resulting in genetic variation, making the resulting paramecia genetically different from the originals. It is a form of sexual reproduction.

Question 8

You are rowing a boat across a marine estuary at night and see flashes of light in the water.This is most likely a result of the action of

Accepted Answer

Flashes of light in the water are most likely caused by bioluminescent organisms, and among the given choices, dinoflagellates are known for their bioluminescence.

Question 9

All eukaryotes that are not plants,fungi,or animals have traditionally been called _______.

Accepted Answer

The answer of All eukaryotes that are not plants,fungi,or animals...

Question 10

The _______ are an exclusively parasitic protist group with elaborate lifecycles;for example,Toxoplasma alternates between rats and cats as hosts.

Accepted Answer

The answer of The _______ are an exclusively parasitic protist...

Question 11

In alternation of generations,the gametophyte generation is _______ and produces _______.

Accepted Answer

In alternation of generations, the gametophyte generation is haploid and produces gametes. This is because the haploid gametes fuse during fertilization to form a diploid zygote, which then gives rise to a diploid sporophyte generation that produces spores through meiosis.

Question 12

Ancient marine protists are responsible for the existence of

Accepted Answer

Ancient marine protists, specifically diatoms and dinoflagellates, are responsible for the production of both petroleum and natural gas. Petroleum is formed from the remains of diatoms and other organisms that sink to the ocean floor and become buried under sediment. Natural gas is formed from the remains of dinoflagellates and other organisms that are buried under sediment and subjected to high pressure and temperature, causing the organic matter to break down into hydrocarbons. Coal, on the other hand, is formed from the remains of land plants that lived millions of years ago. Hydrogen fuel reserves are typically produced through chemical processes and are not directly related to ancient marine protists.

Question 13

The _______ clade includes the choanoflagellates,animals,and fungi.

Accepted Answer

The answer of The _______ clade includes the choanoflagellates,animals,and fungi....

Question 14

Some dinoflagellates live endosymbiotically with corals.When they die or are expelled by the corals-a phenomenon called "coral bleaching"- the corals can be damaged or destroyed because the dinoflagellates

Accepted Answer

The dinoflagellates living endosymbiotically with corals contribute to their nutrition through photosynthesis. Without these dinoflagellates, the corals can be damaged or destroyed due to lack of nutrients, leading to "coral bleaching."

Question 15

Foraminiferan fossils

Accepted Answer

Foraminiferan fossils can be used to classify and date sedimentary rocks, but they are not used as insecticides and they are not only found under today's oceans. While fossil fuels are formed from organic matter, foraminiferan fossils alone do not create supplies of fossil fuels.

Question 16

Which statement about the process of conjugation is false?

Accepted Answer

Conjugation is not a reproductive process; it is a sexual process of genetic recombination where genetic material is exchanged between two organisms, but it does not result in the production of new organisms.

Quiz 20: The Origin and Diversification of Eukaryotes