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byzantiumsquirrel341Lv1

28 Sep 2019

Which of the following animals use tube feet for filter feeding?

Select one:

a. Sea cucumbers

b. Sea stars

c. Brittle stars

d. Sea urchins

e. Crinoids

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Casey DurganLv2

28 Sep 2019

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1. A stalked, sessile marine organism has several elongated feeding structures surrounding an opening where good is ingested. This organism could potentially be a cnidarian, a tube-dwelling worm, a crustacean or an echinoderm. Finding which of the possibilities below in this organism would allow you to be certain of the organismâs identity?

a. Radial symmetry

b. A hard shell composed of calcium carbonate

c. The presence of a sac body plan

d. A nervous system

2. An elementary school science teacher decided to liven up the classroom with a salter aquarium. Knowing that saltwater aquaria can be a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. nExt, the teacher decided to stock the tank with various marine invertebrates, including a polychaete(annelid), a siliceous sponge, several bivalves, a shrimp, several sea anemones of different types, a colonial hydra, a few coral species, a sea star, and several herbivores gastropod varieties. Lastly, she added some vertebratesâa parrotfish and a clownfish. She arranged for daily feedings of copepods and feeder fish. ï¼Questions 2-4)

Parrotfish have mouths adapted to scrape algae off a coral and can even munch on croal as well. If the aquariumâs corals rapidly died in their place would be shards ofâ¦

a. Chitin

b. Calcium carbonate

c. Silica

d. Cartilage

3 The teacher wanted to demonstrate that some of the invertebrates possess a closed circulatory system. The teacher would remove and dissect aâ¦

a. Polychaete

b. Bivalve

c. Sea star

d. Shrimp

4. The bivalves in the aquarium started to die one by one; only the undamaged shells remained. If the teacher used a microscope to examine the external surfaces of the empty shells of the bivalves, the teacher would probably see (marks?) left byâ¦

a. Jaws

b. Nematocysts

c. Tube feet

d. Radulae

turquoisedeer344

Which of the following statements is TRUE regarding sea anemones?

	None of the answer options is correct.
	Spongesânot sea anemonesâpossess what is considered to be the âsimplestâ nervous system found in animals.
	Because sea anemones are âsimpleâ organisms, these animals only possess motor neurons; sensory neurons or interneurons are never found in sea anemones.
	Although sea anemones possess ânet-likeâ nervous systems, these animals have brains located at their bases (near where they would attach to rocks).
	Although sea anemones lack definitive brains, they do possess ganglia that serve a similar function to the paired ganglia of flatworms.

Some people have low levels of calcium circulating in the blood, a condition known as hypocalcemia. While for many this disorder has little to no effect, for some it can be life-threatening. How could low levels of calcium harm an individual?

	Low levels of calcium would not have any effect on synaptic transmission.
	Low levels of calcium would cause sustained depolarization of the presynaptic cell.
	Low levels of calcium would result in fewer signals sent between the pre- and postsynaptic cell.

Cephalization is: the

	All of these choices are correct.
	development of a brain within the head of an animal.
	concentration of sensory organs within the head end of an animal.
	development of a âhead endâ in an organism.

Which of the following are TRUE about the resting membrane potential? (Select all that apply.)

	It results from voltage-gated sodium channels remaining open for long periods of time.
	It results from K⁺ ions diffusing out of the cell.
	It results from the sodium-potassium pump moving more Na⁺ ions out of the cell than K⁺ ions into the cell.

Afferent and efferent neurons differ in:

	their size.
	the directionality of the information they send.
	their pattern of myelination.

A neuron that responds to the environment is a(n):

	interneuron.
	homeostatic neuron.
	motor neuron.
	sensory neuron.

Which of the following is NOT the role of an interneuron?

	stimulating a muscle to contract
	conveying information from the internal environment of an animal
	relaying information from sensory to motor neurons
	maintaining homeostasis