What allows things to enter and leave a cell and is the gate keeper?

An open wound in which tissue is separated from the body

Atom A consists of 10 protons, 12 neutrons, and 10 electrons. Atom B consists of 10 protons, 10 neutrons, and 12 electrons. The atoms are isotopes of each other. The atoms are not isotopes of each other.

2. Originally, scientists classified organisms into five kingdoms based, in part, on structure. O cell family organ

Which enzyme is coded for in the chromosome of bacteria. A: beta-galactosidase B: glucose C: lactose D: galactose

How do cells in a multicelluar organism become specialized

Which statement best describes the life cycle of plants such as ferns

Melting snow ponds and water found in rolls are examples of

Do bears have any other Behavioral Adaptations other than hibernation.

Enhancer i can stimulate the transcription of gene a, but the insulator blocks its effect on gene b. enhancer ii can stimulate the transcription of gene b, but the insulator blocks its effect on gene a.

Anna heated 15 g of Substance A to obtain 5 g of substance B, 4 g of Substance C, and a certain amount of Substance D, which statement is correct A) the mass of substance D was 10g less than the mass of substance A B) the mass of substance D was 1 g