Why did the authors choose to look specifically for vertebrate mitochondrial genes in their core samples?
A. Only vertebrates eat plants.
B. Animal cells do not have chloroplasts.
C. Animal cells do not have a nucleus.
D. Animals would have been present in Beringia before plants.
E. They wanted to distinguish animal mitochondria from plant mitochondria.
E. They wanted to distinguish animal mitochondria from plant mitochondria.
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Which system is responsible for providing protection, regulating body temperature, and being the site of cutaneous receptors?
Match the following descriptions (A-C) with the terms in the table. These descriptions may be used more than once or not at all
a. an extracellular matrix component b. a cell adhesion molecule c. part of the cytoskeleton 1. lignin 2. collagen 3. integrin 4. actin 5. microtubule 6. cellulose 7. middle lamella 8. cadherin 9. tubulin 10. keratin 11. pectin 12. intermediate filament 13. microfilament What will be an ideal response?
Which property is shared by the processes of replication and transcription?
a. One strand of nucleic acid serves as a template for synthesis of another. b. They require ribsomes. c. They both take place in the cytoplasm of the cell. d. They both make copies of DNA. e. They both use the nucleic acid uracil.
What organism has photoreceptors?
a. Sea anemones b. Hydroids c. Corals d. Jellyfish