Which of the following best represents regeneration by a stem cell-mediated mechanism?
a. healing of skin after an injury
b. ability of a newt to regrow an entire limb
c. cutting a planaria into pieces that each regrow into new animals
d. ability of a zebrafish to regrow a section of ventricle after amputation

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic. b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy. c. all bacterial enzymes are harmful to humans and the environment. d. microbes create pollutants and toxins that harm the environment.

The reactions that occur in the ribosome, where amino acids are combined to form proteins are anabolic or catabolic?

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi, r^3 , where r is the sphere’s radius.