A chemical that binds to a cell to cause its activity to change is an example of which of the following elements of cellular communication?
A. a signaling cell
B. a signaling molecule
C. a receptor molecule
D. a responding cell
E. None of these choices are correct.
B
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Types of steroids include:
A. sex hormones such as estrogen and testosterone. B. glucocorticoids that regulate blood glucose levels. C. insect molting hormones. D. lipid-soluble hormones derived from cholesterol. E. All of these choices are correct.
Vascular plants can be divided into ____ groups according to how they complete their life cycle, particularly the dispersal phase
A. 1 B. 2 C. 3 D. 4 E. 5
Which type of bond exists between two amino acids in a protein?
a. peptide b. ionic c. hydrogen d. amino e. sulfhydryl
Hemophilia is a group of different inherited blood-clotting disorders. Which is true about hemophilia?
A. It causes sterility. B. It is more common in males than in females. C. It is inherited only on the autosomes. D. It is more common in females than in males.