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BIOS 1063 Animal Homework
Terms in this set (26)
Which of these is a defining characteristic of animals that distinguishes them from other eukaryotes?
Animals ingest food.
Animals are multicellular.
Animals use photosynthesis.
Animals are heterotrophs.
Animals ingest food
The common ancestor of all animals is likely to have been a
colonial, flagellated protist
Flatworms are similar to cnidarians in that both
have trust issues
Which of these exhibits radial symmetry?
What type pf symmetry does this (jelly fish) organism exhibit?
Over one million species of animals have been names and described by biologists. These species arose
through years of evolution as natural selection shaped animal adaptations to Earth's environments
How are animals different from fungi?
Animals obtain food by ingestions, and fungi obtain food by absorption
(Both animals and fungi are heterotrophic, but they differ in how they obtain their food.)
The _________ explosion occurred approximately 545 million years ago.
One body plan, called bilateral symmetry, represents a major branch point in animal evolution and can be described as
a body plan with only one way to split it into two equal halves--right down the midline
(Most bilateral animals also feature a nerve center in the form of a brain at the head end.)
How do sponges differ from all other animals?
Sponges lack true tissues
The segmented body of the worm below (ringworm) suggests that it is a(n)
What name is given to the food-trapping cells of sponges?
The mobile stage of cnidarian life cycle is the ________ stage.
_____________ are characterized by stinging cells used for defense and for capturing prey.
A(n) _________ is an example of a mollusc that does not have a shell.
Which of the following is an invertebrate?
(Sponges don't have backbones, notochords, or spinal columns, so they are invertebrates.)
tentacles with stinging cells
(These are used to capture prey and push food into the gastrovascular cavity.)
Members of the phylum Mollusca
are soft-bodies and usually covered by a shell
(Members of the phylum Mollusca, such as oysters and clams, are soft-bodied and are usually covered by a shell.)
Which group of animals includes the simplest animals with bilateral symmetry?
(The name of this phylum is Platyhelminthes, which includes flatworms, the simplest animals to exhibit bilateral symmetry.)
Annelids, such as leeches, __________, a characteristic shared by all other bilateral animals except flatworms.
exhibit a complete digestive tract
(Annelids have a digestive tube with two openings including a mouth and an anus.)
Which of the following are called nematodes?
(Nematodes, often called roundworms, have a cylindrical body, which is usually tapered at both ends.)
Which of the following would most likely cause Turritopsis dohrnii to go through cellular transdifferentiation?
Very cold temperatures
Being exposed to salt water
Being eaten by a sea slug
Being repeatedly poked and prodded
Being repeatedly poked and prodded
Which of the following is the sexual stage of a hydrozoan?
You are a scientist specializing in hydrozoans. You observed a species with many stolons. What will these stolons become?
You are a cancer researcher and you discover an on-off switch for the BRAF oncogene. What have you found?
If Shin Kubota's hunch is correct, the key to Turritopsis dohrnii immortality lies where?
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