Which of the following sequences is an example of a point mutation of the dna sequence -a-a-g-t-g-c-? a. -a-a-a-t-g-c- b. -a-a-g-u-g-c- c. -g-t-a-g-a-a-c- d. -a-a-g-g-t-c-

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

What are genotypes? what are phenotypes?

Describe how a student should adjust the microscope to see the cells on a slide more clearly?