Which enzymes are used by genetic engineering

Which of the following is always an important part of an experiment? 1. making a working model 2. observing things in nature 3. making drawings of things observed 4. identifying and controlling variables

How does a paramecium move

Where do you think all living things on Earth get their energy?

Species of goby fishes build nests by digging burrows in which their young are born. When individuals of two different groups of gobies mate, their offspring are healthy and fertile, but lack the ability to build nesting burrows.

7. In comparing hydrochloric acid (pH 1) and sodium hydroxide (pH 13), is one more dangerous than the other? Why or why not?

Explain how blood is prevented from flowering backwards in the heart

He phase of the cell cycle where dna replication, chromosome duplication and preparations for cell division occur is called

Why do you think phytoplankton are so important to all living things on earth?

The weakness of hydrogen bonds between the bases of DNA allows what?

Which statement is correct? The number of electrons of a neutral atom always equals the number of protons. The number of neutrons always equals the number of protons. The number of neutrons always equals the number of electrons.