CRISPR-Cas9 is a genetic modification technique that edits parts of the genome of an organism. Using this technique scientists can add, remove, or modify sections of the DNA

sequence.

How can scientists use this technique to control gene expression?

A By activating or deactivating specific genes

B By calculating the number of genes different organisms produce

C By identifying how closely related one individual is to another

D By determining the number of chromosomes in an organism

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.