Mouse eye genes can be inserted into Drosophila and can regulate the flies' eye formation. Differences in size and shape of a zebra are controlled by a gene also found in zebrafish. What do these examples illustrate?
What will be an ideal response?
conserved genes or conservation (of genes)
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Mitochondria contain their own DNA and replicate on their own. Why is it that they don't suffer the same consequences as our cells in terms of limited division?
A. Because they have high telomerase activity. B. Shortening of the DNA is only a problem with nuclear DNA; shortening of mitochondrial DNA isn't catastrophic. C. Mitochondrial DNA is circular, so it doesn't shorten when it replicates. D. Since mitochondrial DNA only contains a few genes, it can last a lot longer. E. Because they have high telomerase activity and their DNA is circular and so doesn't shorten in replication.
The primary reason for the daylight migration of many pelagic animals to deeper waters is:
a. escape from visual predators. b. escape from the harmful effects of the sun. c. preference for the colder waters of the deep. d. the abundance of food in deeper waters.
An incomplete digestive system is seen in:
a. flatworms only b. cnidarians only c. both roundworms and annelids d. both cnidarians and flatworms e. mollusks
Which of these is NOT a characteristic of sponges?
a) Amoebocyte cells transport food and make skeletal fibers and gametes. b) Flagellated choanocytes move water. c) Water enters through a single cavity, the osculum. d) sessile filter feeders e) body wall has two cell layers