BIOL 1902 Study Guide - Shrew, Botulism

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goldeel903

20 Jul 2012

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Selective feeding = leave behind bones and feathers, etc Some animals pass indigestible bits through their body: owls swallow their pray whole (gizzard separates meat from bones and hair, the stuff not digestable are rolled into a ball. #1 problem facing predators such as eastern wolf: starvation. Flesh fly investigates a potential host (has to be right size) Inject a dna viruses into the host -> behaviour and internal parts changes (megarhyssa) ichneumon ovipositors are impressive. When egg hatches, the paralyzed is eaten. Pelecinid wasps lay eggs on june beetle grubs in the ground.

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Describe 4 key events in the geologic record.
An ecologist studying predators and their prey in White SandDunes State Park found that nocturnal pocket mice exist in dark andlight morphs. In this area, 42% of the mice are dark and 58% arelight. Because owls swallow their prey whole and then cough upâpelletsâ consisting of bones and fur, the ecologist was able todiscover that 61% of the mice caught by owls were dark and 39% werelight. What is likely to happen to the pocket mouse population inthe future, and why? Use specific terminology

grayrat725

QUESTION 94

Which characteristic is shared by Phylum Cnidaria and Phylum Platyhelminthes?

		dorsoventrally flattened bodies
		radial symmetry
		a distinct head
		a digestive cavity with a single opening (sac-like)

1 points

QUESTION 95

Which of the following is not a characteristic of members of Phylum Porifera?

		choanocytes
		asymmetry
		nervous system
		spicules

1 points

QUESTION 96

Most animals are bilaterially symmetrical deuterostomes.

True

False

1 points

QUESTION 97

Parasitism is one of the most widespread life strategies to evolve. Which of the following supports this finding?

		Parasites almost always predigest their hosts' tissues and, therefore, spend less energy and require fewer structural adaptations.
		Parasites, unlike predators, feed on almost all the tissues of their hosts.
		Parasites do not generally kill their hosts; thus they can feed on the same host throughout the host's normal life span and do not have competition from decomposers.
		Parasites generally kill their host and can feed for a very long time because they are much smaller than their host.

1 points

QUESTION 98

The production of sterile mules by interbreeding between female horses (mares) and male donkeys (jacks) is an example of _____.

		reduced hybrid viability
		hybrid breakdown
		reduced hybrid fertility
		mechanical isolation

1 points

QUESTION 99

A snail-like, coiled, porous test of calcium carbonate is characteristic of

		diatomes
		ciliates
		water molds
		foraminiferans

1 points

QUESTION 100

Which group of algae can create "red tide"?

		Phaeophyta
		Dinoflagllata
		Rhodophyta
		Chlorophyta

In mutation accumulation experiments on Caenorhabditis elegans, deleterious mutations were observed to accumulate at a slow but steady rate when the populations were grown in a benign environment, with optimal temperature and humidity, minimal crowding of individuals, abundant food, and no predators or parasites. Control lines grown under normal conditions did not accumulate mutations at the same rate. After 240 generations, experimental lines that had accumulated substantial mutations were removed from the benign environment and these lines were propagated. Explain the results once the recovery lines were established, and how this experiment demonstrates the significance of natural selection in the evolutionary process.

BIOL 1902 Study Guide - Shrew, Botulism

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