Which of the following statements is true regarding how R groups affect ?-helix stability?
A. Adjacent, oppositely charged side chains can increase stability.
B. Due to its small size, glycine increases stability.
C. Bulky R groups create stabilizing van der Waals forces.
D. Since they are located on the exterior of the ? helix, R groups do not significantly alter stability.
E. None of these answers is correct.
A
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Approximately how much of the human genome varies between individuals?
A. 99.9% B. 97.0% C. 50.0% D. 3.0% E. 0.1%
The process that produces mRNA from DNA is called
A. transcription. B. translation. C. replication. D. processing. E. post-translational modification.
Cuticle, guard cells, stomata, and trichomes are all terms associated with ____
a. ground tissue b. vascular tissue c. meristem d. dermal tissue e. secondary tissue
Sometimes swabs are taken of the inside of the mouth for DNA sampling. What type of cell is being collected?
Simple columnar epithelium Stratified columnar epithelium Simple cuboidal epithelium Stratified squamous epithelium