Download Best Answer: Heliozoa

Posting ID: 42778
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Biology, Cell Biology
Year 1
Best Answers are highlighted in red followed by a brief explanation of why it is the
best answer. See answeres below on second page below:
Bacteria
What phylum are the “Sun Animalicules” in?
a. Heliozoa
b. Actinopoda
c. Acanthocephala
d. Amoeba
Radiolarians are most kin to the:
a. heliozoa
b. amebas
c. paramecia
d. rotifers
Which type of diatom can move the best?
a. centrates
b. pennates
c. helical
d. rhombus
What are food vacuoles used for?
a. capture food
b. digest food
c. transport food
d. excrete waste
What do ciliates use for water balance?
a. food vacuoles
b. contractile vacuoles
c. nucleus
d. cell membrane
How are rotifer spores transported?
a. water
b. wind
c. soil
d. animals
Some rotifers feed on bacteria.
a. True
b. False
Bacteria are the simplest and oldest lifeforms.
a. True
b. False
All ciliates are microscopic.
a. True
b. False
Diatoms, like many beautiful creatures, are very rare life-forms.
a. True
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b. False
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Bid Credits: 3
Deadline: June 15, 2005, 5:09 pm EDT
Biology, Cell Biology
Year 1
Bacteria
1. What phylum are the “Sun Animalicules” in?
a. Heliozoa
b. Actinopoda
c. Acanthocephala
d. Amoeba
Best Answer: Heliozoa
Why? Sun animalcules or Heliozoa, phylum Actinopoda (=ray footed) have axopodia, long stiff projections of
cytoplasm. They cannot locomote that much with them but they are excellent for capturing prey. The prey, usually
small protists, sticks to the axopods and will be covered by the cytoplasmic flow running along the axopods and
transported towards the cell
2. Radiolarians are most kin to the:
a. heliozoa
b. amebas
c. paramecia
d. rotifers
Best answer: c. Paramecia
Why? Both radiolarians and paramecia are form the KINGDOM EUKARYOTA and classified as THE "PROTISTS"
http://www.nearctica.com/nathist/phylog.htm
3. Which type of diatom can move the best?
a. centrates
b. pennates
c. helical
d. rhombus
Best Anaswer: b.pennates
Why? There are only two types of diatom- the centrates and pennates. The pennates are pen-shaped and the
centric which are like a cylinder. Pennates show motility - Navicula is a common pennate diatom which shows
motility. This motility is found only in certain of the pennates and is associated with a longitudinal slit in the valve
called a raphe. Navicula has a raphe in both valves, but other diatoms showing motility have the raphe in only one
valve. It is thought that a slime produced within the cell is exuded through the raphe enabling the diatom to glide
along surfaces it contacts. The details of this process are still unclear. However, no centric diatoms show motility.
(http://www.micrographia.com/specbiol/alg/diato/diat0200.htm).
4. What are food vacuoles used for?
a. capture food
b. digest food
c. transport food
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d. excrete waste
Best Answer: a. capture food
Why? The vacuole acts a container. A food vacuole in a single celled amoeba contains the food item that the
amoeba has consumed. The central vacuole of a plant cell contains water and substances such as amino acids,
sugars and other compounds tat the plant needs (http://www.winterwren.com/apbio/cellorganelles/vacuoles.html).
5. What do ciliates use for water balance?
a. food vacuoles
b. contractile vacuoles
c. nucleus
d. cell membrane
Best Answer: b. contractile vacuoles
Why? Star-shaped contractile vacuoles or water expelling vesicles are used to balance the amount of water in the
cell. However, the Food vacuoles are used to transport the food through the cell (http://www.microscopyuk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/cilidr.html).
6. How are rotifer spores transported?
a. water
b. wind
c. soil
d. animals
Best Answer: b. wind
Why? Because many species make so-called resting spores which are easily carried by the wind, they can be found
anywhere if there is a little bit of water. Even in a roof gutter or in birdbaths (http://www.microscopyuk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/cilidr.html).
7. Some rotifers feed on bacteria.
a. True
b. False
Best Answer: a. True
Why? This microbe is a tiny, true animal. The name rotifer is from Latin meaning "wheel bearer". The two
wheels on rotifers are made of cilia that beat and create a current that draws water-containing food into the gut
of the rotifer. These live mainly in freshwater, in bogs, lakes, and rivers, although some inhabit seas and damp
soil. There are about 2000 species of rotifers. Rotifers eat bacteria, protists, and other small animals
(http://museum.utep.edu/chih19/intro/life/rotiferx.htm).
The different species feed in three ways, known as the filterers, the graspers and the capturers. The filterers have
already been described, their cilia creating currents in the water to bring the food in the region of the mouth. The
graspers extend the mastax forward into the mouth, whilst the capturers form a trap by the closure of the corona
cilia around the prey. These capturers are always sessile (http://www.microscopyuk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/cilidr.html).
8. Bacteria are the simplest and oldest life forms.
a. True
b. False
Best Answer: True
Why? Bacteria are the most ancient life forms Most bacteria are so small that under a light microscope you can
only see them as little dots. Some groups however grow to larger sizes and have spectacular shapes
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(http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopyuk.org.uk/mag/wimsmall/cilidr.html).
9. All ciliates are microscopic.
a. True
b. False
Best Answer: b. False
Why? Ciliates are unicellular protists that can be recognised by their hairlike 'cilia'. They use them for locomotion
and for feeding.Some ciliates are very small, not much larger than the largest bacteria. Others like the 'trumpet
animalcule' Stentor can reach a size of two millimetres so it can be seen with the naked eye. Paramecium does
not become much larger than 0.3 mm (http://www.microscopyuk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/cilidr.html).
10. Diatoms, like many beautiful creatures, are very rare life-forms.
a. True
b. False
Best Answer: b. False
Why? Actually they are quite numerous. At the end of the winter, for example, they are most numerous in fresh
water. They will cover surfaces of aquatic plants or poles and wooden borders of ponds (http://www.microscopyuk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/cilidr.html).
FINAL COMMENTS I HOPE THIS HELPS AND TAKE CARE.
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