Which feature is shared by euglenoids and kinetoplastids?
a. an eyespot
b. flagellated
c. photoautotrophy
d. parasitic existence
e. marine and freshwater habitats
ANSWER: b
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What does DNA sequencing suggest about the relationship between the nuclear and organellar genomes?
A) The same subset of mitochondrial genes has moved to the nuclear genome in all species. B) Mitochondrial genes that are found in the nuclear genome do not have introns, suggesting that movement occurred via an RNA intermediate. C) The mitochondrial and nuclear genomes are entirely independent of each other. D) Some cells have two types of mitochondria that have different genome sequences. E) Some proteins found in mitochondria are imported from the cytoplasm.
If several traits are affected by the same allele, the allele is said to be
A. pleiotropic. B. dominant. C. epistatic. D. recessive.
In the process of peristalsis:a
waves of muscular contractions force food down the digestive tract. b. chemical digestion of food takes place in the digestive tract. c. food is discharged from the bodies of unicellular animals. d. digestion occurs intracellularly within food vacuoles. e. digestion of food takes place outside the body of an animal.
What is the role of opsonins?
a. They attract phagocytes to the location of infection. b. They create "handles" that make it easier for the pseudopods of phagocytes to attach to the microbe invader. c. They aid in the formation of the phagolysosome. d. They are present on the surface of phagocytes.