The membrane proteins that change shape and bind with specific molecules to transport them across the cell membrane are

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.

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?