 |
1 | |
An investigator discovered an organism new to science with the following characteristics: a mouth surrounded by a rotary corona, flame bulbs just below an eyespot; an alimentary tract with a mouth followed by a mastax, then a complete stomach, intestine, and anus. After considering these characteristics, it would probably be classified as a(n)... |
|
| | A) | Sponge |
| | B) | Rotifer |
| | C) | Nematode |
| | D) | Hookworm |
| | E) | None of the above is correct |
|
2 | |
Nematodes are the most important pseudocoelomate animals, both in terms of numbers and their impact on humans. |
|
| | A) | True |
| | B) | False |
|
3 | |
Some pseudocoelomate phyla are now assigned to the Superphyla Ecdysozoa and Lophotrochozoa. |
|
| | A) | True |
| | B) | False |
|
4 | |
Of the nine phyla of pseudocoelomates, all have the original blastocoel of the embryo persist as a space, or body cavity, between the enteron and the body wall. This cavity lacks the peritoneal lining found in acoelomates. |
|
| | A) | True |
| | B) | False |
|
5 | |
Pseudocoelomate animals have all but one of the following over the acoelomates. |
|
| | A) | Greater freedom of movement |
| | B) | Space for the development and differentiation of the digestive, excretory, and reproductive system |
| | C) | A simple means of circulation or distribution of materials throughout the body |
| | D) | A better means of asexual reproduction |
| | E) | A hydrostatic organ |
|
6 | |
Based on ribosomal RNA gene analyses, which one of the following phyla is not a member of the Superphylum Ecdysozoa? |
|
| | A) | Nematoda |
| | B) | Nematomorpha |
| | C) | Rotifera |
| | D) | Kinorhyncha |
| | E) | Priapulida |
|
7 | |
Which of the following is incorrect? |
|
| | A) | Eutely is the constant number of cells or nuclei in individuals of a species |
| | B) | Pseudocoelomate phyla are characterized by bilateral symmetry and three germ layers |
| | C) | The digestive system of pseudocoelomates is complete |
| | D) | The body of pseudocoelomates is typically vermiform with a body wall that is a syncytium |
| | E) | Cerebral ganglia are always lacking |
|
8 | |
Nematodes may be which of the following? |
|
| | A) | Free-living |
| | B) | Saprozoic |
| | C) | Coprozoic |
| | D) | All of the above |
| | E) | None of the above |
|
9 | |
Virtually every species of vertebrate and many invertebrates serve as hosts for one or more types of parasitic nematodes. |
|
| | A) | True |
| | B) | False |
|
10 | |
A hydrostatic organ is highly developed in nematodes, and much functional morphology of nematodes can be best understood in the context of the extremely low hydrostatic pressure in the pseudocoel. |
|
| | A) | True |
| | B) | False |
|
11 | |
Which of the following is incorrect? |
|
| | A) | Cuticle-noncellular, secreted by the hypodermis |
| | B) | Collagen-a structural protein also found in vertebrate connective tissue |
| | C) | Muscles-only contract longitudinally in nematodes |
| | D) | Parastic nematodes-have an advanced Krebs cycle for metabolism |
| | E) | Phasmids-similar to the sensory amphids |
|
12 | |
Which of the following is incorrect? |
|
| | A) | Hookworm-Ancylostoma duodenale |
| | B) | Pinworm-Enterobius vermicularis |
| | C) | Intestinal roundworm-Trichuris trichiura |
| | D) | Trichina worm-Trichinella spp |
| | E) | All of the above are correct |
|
13 | |
It is estimated that nearly 1.2 billion people are infected worldwide with Ascaris lumbricoides. |
|
| | A) | True |
| | B) | False |
|
14 | |
Which one of the following diseases is NOT caused by filarial worms? |
|
| | A) | Elephantiasis |
| | B) | River blindness |
| | C) | Dog heartworm |
| | D) | Swimmer's itch |
| | E) | All of the above are caused by filarial worms |
|
15 | |
Which of the following is not correct? |
|
| | A) | The popular name for Nematomorpha is "horsehair worms" |
| | B) | The dog heartworm is troublesome, but not dangerous |
| | C) | Members of the Phylum Kinorhyncha are all marine worms bearing thirteen segments with spines but no cilia |
| | D) | The Phylum Loricifera were first described in 1983 |
| | E) | The Phylum Priapulida contains only 18 species of burrowing, predaceous animals |
|
16 | |
The Lophotrochozoa phyla include all but which of the following? |
|
| | A) | Rotifera |
| | B) | Acanthocephala |
| | C) | Gastrotricha |
| | D) | Entoprocta |
| | E) | All of the above belong to the Superphylum Lophotrochozoa |
|
17 | |
Which of the following is incorrect? |
|
| | A) | Rotifera-"wheel bearer" |
| | B) | Corona-ciliated crown |
| | C) | Lorica-caselike fibrous layer |
| | D) | Pedal glands-involved in attachment to a substrate |
| | E) | Diploid amictic eggs-thick-shelled eggs produced by haploid females |
|
18 | |
Endoparasitic acanthocephalans inflict traumatic damage by penetrating the host's intestinal wall with the spiny... |
|
| | A) | Mastax |
| | B) | Proboscis |
| | C) | Sharpened cilia |
| | D) | Cloaca |
| | E) | None of the above is correct |
|
19 | |
Members of the Phylum Gastrotricha are ventrally flattened animals that are somewhat like rotifers except that they lack a corona and mastax. |
|
| | A) | True |
| | B) | False |
|
20 | |
The Entoprocta comprise a small phylum containing only 150 species of tiny, sessile animals that resemble hydroid cnidarians but have ciliated tentacles. |
|
| | A) | True |
| | B) | False |
|
21 | |
In 1995 a tentatively new phylum was discovered on the common Norway lobster. They may be either acoelomate or pseudocoelomate in construction, but their bizarre life cycle includes internal budding from a sessile stage to produce motile stages. The name of this new phylum is... |
|
| | A) | Ectoprocta |
| | B) | Enteroprocta |
| | C) | Cycliophora |
| | D) | Ciliata |
| | E) | None of the above is correct |