What is a unifying feature of all animals, but is not seen outside of the animal kingdom?
A. They are terrestrial or secondarily aquatic.
B. They are unicellular.
C. They have immobile gametes.
D. The nature of their small subunit rRNA gene sequences is different.
E. They have a cell wall.
D. The nature of their small subunit rRNA gene sequences is different.
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________ is the direct migration and penetration of cancer cells into neighboring tissues.
Fill in the blank(s) with the appropriate word(s).
Dolly developed an infection in her lungs and was
euthanized at the age of about a. two months. b. two years. c. three years. d. six years. e. nine years.
Which of the following statements is NOT true of DNA methylation?
A. Methylation is permanent and cannot be reversed. B. It is associated with transcription repression. C. Cytosines on both strands are usually methylated. D. It occurs on cytosines adjacent to guanines. E. It is carried out by DNA methyltransferases.
The single ventricle in an amphibian heart means the oxygenated and deoxygenated blood mix. How do amphibians manage to survive despite this inefficiency?
A. They transport oxygen across the skin. B. They keep their body temperatures high. C. The absorb large amounts of fluid. D. They keep gills into adulthood. E. They move very slowly.