Which of these groups is characterized by glasslike walls containing silica?
Diatoms are characterized by glasslike walls containing silica.
What is true about secondary endosymbiosis?
Which of the following is true of secondary endosymbiosis? An organism containing an endosymbiont is engulfed by another organism and becomes an endosymbiont.
Which of the following is characteristic of ciliates?
The ciliates are a group of protozoans characterized by the presence of hair-like organelles called cilia, which are identical in structure to eukaryotic flagella, but are in general shorter and present in much larger numbers, with a different undulating pattern than flagella.
Which algal group has chloroplasts?
C. Chlorophyta or green algae constitute a division that has the following set of attributes: chloroplasts with no external endoplasmic reticulum, thylakoids typically in stacks of two to six, chlorophyll-a and -b as photosynthetic pigments, true starch, and cellulosic walls or scales (Table I).
Which of these human diseases is caused by an Apicomplexan protozoan?
Malaria, which is caused by the apicomplexan protozoan Plasmodium, remains a serious disease despite measures that can be taken to control and eradicate the mosquito vector host and despite the availability of an array of antimalarial drugs.
What protist evolved secondary endosymbiosis?
The process of secondary endosymbiosis is not unique to chlorarachniophytes. In fact, secondary endosymbiosis of green algae also led to euglenid protists, whereas secondary endosymbiosis of red algae led to the evolution of dinoflagellates, apicomplexans, and stramenopiles.
What supports secondary endosymbiosis?
Secondary endosymbiosis is when a living cell engulfs another eukaryote cell that has already undergone primary endosymbiosis. This evidence of a phospholipid bilayer also encourages that both mitochondria and chloroplasts originated from endosymbiosis.
Which of the following are shared characteristics of ciliates?
The ciliates share the following distinguishing characteristics:
- possession of cilia as locomotory organelles.
- possession of two kinds of nuclei.
- a distinct form of asexual reproduction resulting from two nuclei.
- a unique type of sexual reproduction.
How is genetic variation generated in ciliates?
Conjugation (or mating) of ciliates is a unique phenomenon among living beings. They have sex not for reproduction or pleasure — they seek to increase genetic variation. The mating process is one of the most important mechanisms for maintaining genetic variation in natural populations.
Do algae have Pseudopodia?
For example, algae do not have roots, stems, or leaves. Some algae also differ from plants in being motile. They may move with pseudopods or flagella. Although not plants themselves, algae were probably the ancestors of plants.