Which characteristic distinguishes growth factors from other micronutrients?
a. Cells are unable to biosynthesize them.
b. They are essential for growth.
c. They have only monovalent ions.
d. They have an organic composition.
Answer: D
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A large population made up of smaller populations linked by migration is a ____
Fill in the blank with the appropriate word.
Homeobox genes
A) encode proteins with a conserved sequence of amino acids. B) are important in development. C) are conserved in multicellular animals. D) are transcription factors. E) All of these
Which of the following species interactions is(are) considered symbiotic?
A. competition B. predator/prey C. parasite/host D. mutualism E. Both C and D are correct.
Why was the one gene: one enzyme hypothesis changed to one gene: one polypeptide chain?
a. because of the discovery of homomultimeric proteins b. because of the discovery of heteromultimeric proteins c. because of the discovery of ribozymes d. because not all enzymes are proteins e. because messenger RNA is used as the template for polypeptide synthesis