Bones are important in balancing which mineral in the body?
1.sodium
2.potassium
3.iron
4.magnesium
5.calcium
5
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We can conclude that natural selection must have acted in favor of large brains in humans because:
A. we have large brains in proportion to our body size compared to other mammals. B. large brains have allowed us to dominate the planet. C. large brains are metabolically expensive to produce and maintain. D. we would not have large brains if natural selection did not favor them. E. None of the answer options are correct.
Which scientific field is involved in the identification, classification, and naming of organisms?
A. Phylogeny B. Epidemiology C. Taxonomy D. Pathology E. Nomenclature
Which of the following statements about paracrine regulation is TRUE?
a. The hormones released only stimulate the cells that secreted them. b. The hormones released only inhibit the cells that secreted them. c. The hormones released act on nearby target cells. d. The hormones released are transported down axons. e. The hormones released link the endocrine and nervous systems.
Which of the following is not good direct evidence that the cell-cycle control system is conserved through billions of years of divergent evolution?
(a) A yeast cell lacking a Cdk function can use the human Cdk to substitute for its missing Cdk during the cell cycle. (b) The amino acid sequences of cyclins in plants are similar to the amino acid sequences of cyclins in humans. (c) The Cdk proteins in humans share conserved phosphorylation sites with the Cdk proteins in yeast. (d) Yeast cells have only one Cdk, whereas humans have many Cdks.