What is the total number of different possible combinations of bases in a codon?
A) 20 B) 3 C) 64 D) 4
C
You might also like to view...
The regulation of blood sugar levels and our stress responses are controlled in part by a negative feedback loop involving cortisol, adrenocorticotropic hormone (ACTH), and corticotropin-releasing hormone (CRH)
What would likely be the result during times of stress if cortisol receptors in the hypothalamus were nonfunctional? A) Blood sugar levels would rise to dangerous levels. B) Blood sugar levels would be unaffected. C) ACTH production would cease. D) CRH production would cease. E) Cortisol production would cease.
Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling. B. Purified plasmid DNAs are supercoiled even though all proteins are removed. C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils. D. Linear fragments of double-stranded DNA are not supercoiled. E. None of these choices is correct.
Which plane divides the body into upper and lower portions?
a. sagittal b. frontal c. transverse d. midsagittal
Liquid water has surface tension and a high specific heat, and it functions effectively as a solvent for polar covalent and ionically bonded molecules. What feature of water imparts these properties?
A) The hydrogen and oxygen that make up water form nonpolar covalent bonds. B) It readily dissociates to form H+and OH- ions. C) It has a high molecular weight. D) Water readily forms hydrogen bonds with other water molecules, and with polar solutes.