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Image:Cnemidophorus-ThreeSpecies.jpg – Wikipedia, the free encyclopedia

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Image:Cnemidophorus-ThreeSpecies.jpg

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Photograph by Alistair J. Cullum, the person uploading the file. Email: acullum@creighton.edu

Shows three species of the lizard genus Cnemidophorus, commonly known as whiptails: C. inornatus, C. neomexicanus, C. tigris.

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  • (del) (cur) 22:39, 24 March 2005 . . Acullum (Talk | contribs) . . 415×353 (48,646 bytes) (Photograph by Alistair J. Cullum, the person uploading the file. Email: acullum@creighton.edu Shows three species of the lizard genus Cnemidophorus, commonly known as whiptails: C. inornatus, C. neomexicanus, C. tigris. {{CopyrightedFreeUseProvidedThat|)

 

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Retrieved from “http://en.wikipedia.org/wiki/Image:Cnemidophorus-ThreeSpecies.jpg“

Mollusks

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Name: 

Mollusks

 

 

True/False
Indicate whether the sentence or statement is true or false.
1.
Mollusks must eat constantly because the functioning of their nephridia causes the disposal of useful molecules as well as of waste products.
2.
Unlike arthropods, mollusks are unsegmented; instead, they are divided into three regions.
3.
Mollusks have four distinct body parts: a foot, a head, a visceral mass, and a tail.
4.
In terrestrial snails, the mantle cavity functions as a simple lung.
5.
Most bivalves have separate sexes, but some are hermaphroditic.
6.
Due to the presence of a shell, all gastropods are capable of living on land for at least a portion of their lives.
7.
Since cephalopods have tentacles, they have no need for a radula.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
8.
All of the following are characteristics of mollusks except that they have
a.
a pseudocoelomate body plan.
c.
a complete digestive tract.
b.
bilateral symmetry.
d.
an open circulatory system.
9.
The cilia of a trochophore larva
a.
allow attachment to the ocean bottom.
b.
create currents for drawing in food.
c.
cover the entire larval body.
d.
are necessary for reproduction.
10.
Trochophore larvae
a.
are found in molluscan life cycles.
b.
possess a belt of cilia around their bodies.
c.
occur in annelid life cycles.
d.
All of the above
11.
A characteristic structure found in many mollusks is the radula, which is involved in
a.
jet propulsion.
c.
eating.
b.
opening and closing of the shells.
d.
reproduction.
12.
All of the following are classes of the phylum Mollusca except
a.
bivalves.
c.
gastropods.
b.
cephalopods.
d.
pseudopods.
13.
The only mollusks that have a closed circulatory system are
a.
bivalves.
c.
chitons.
b.
cephalopods.
d.
gastropods.
      mollusks_files/i0160000.jpg
14.
Refer to the illustration above. Which two organisms in the diagrams possess mantles?
a.
Organisms “A” and “C”
c.
Organisms “A” and “D”
b.
Organisms “B” and “C”
d.
Organisms “B” and “D”
15.
“Jet propulsion” is the usual means of locomotion in water for
a.
arthropods.
c.
cephalopods.
b.
echinoderms.
d.
annelids.
      mollusks_files/i0190000.jpg
16.
Refer to the illustration above. The organism shown in this diagram is a
a.
bivalve.
c.
chiton.
b.
cephalopod.
d.
gastropod.
17.
Refer to the illustration above. This organism possesses a(n)
a.
simple lung.
c.
internal beak.
b.
closed circulatory system.
d.
open circulatory system.
18.
Refer to the illustration above. Movement of this organism is dependent upon the structure labeled
a.
“1.”
c.
“3.”
b.
“2.”
d.
None of the above
19.
Shells of mollusks
a.
may consist of one or more pieces.
c.
allow for the attachment of muscles.
b.
provide protection.
d.
All of the above
20.
Adductor muscles are responsible for
a.
moving the valves of bivalves.
c.
pumping the hearts of mollusks.
b.
extending the feet of mollusks.
d.
fanning the gills of aquatic mollusks.

 
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Lights Out

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Lights Out!

Try to eliminate all the boxes to win. When you check a box, all the squares around it ( one above, one below, and one to each side) are selected. You  win whenever all boxes on the grid are selected! You can play at 5 levels of difficulty. Beware — this game is addictive so don’t forget to do your biology homework!!

 

 

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The JavaScript Source

Mendel Quiz

%CODE1% Mendel Quiz

 

 

 

1. If a heterozygous yellow pea is crossed with a green pea, what proportion of the offspring will be green?

a. none
b. 1/4
c. 1/2
d. 3/4

 

2. If you cross two plants with blue flowers and get both blue and white-flowered plants in the next generation, you can conclude that

a. both parents are heterozygotes
b. blue is the dominant trait (B)
c. white should be symbolized b
d. all of the above

 

3. Albinism is a recessive trait. If a brown mouse whose father was albino is mated with an albino mouse, what proportion of the offspring would be expected to be brown?

a. none
b. 1/4
c. 1/2
d. 3/4

 

4. A monohybrid cross is carried out between parents of genotype Aa. What proportion of the offspring will look like their parents?

a. none
b. 1/4
c. 1/2
d. 3/4

 

5. The genotype of a homozygote would be

a. aa
b. Aa
c. AB
d. bB

 

6. Alternative forms of a gene that influence a given trait are

a. chromosomes
b. gametes
c. alleles
d. cistrons

 

7. A red flower (RR) and a red flower (Rr) have the same

a. alleles
b. genotype
c. haplotype
d. phenotype

 

8. If plants with orange berries (OO) are crossed with plants with yellow berries (oo), what kinds of offspring will result?

a. homozygous orange-fruited plants
b. homozygous yellow-fruited plants
c. heterozygous yellow-fruited plants
d. heterozygous orange-fruited plants

 

9. In an organism of genotype Aa, half the reproductive cells carry ‘A’ and half carry ‘a’. Mendel called this phenomenon

a. segregation
b. dominance
c. recessiveness
d. independent assortment

 

10. A homozygous brown rabbit is crossed to a homozygous white rabbit. If brown is the dominant trait, they should produce

a. all white rabbits
b. all brown rabbits
c. brown and white spotted rabbits
d. a litter of brown and white rabbits in a 1:1 ratio