glucose is a large molecule that cannot diffuse across the cell membrane. Ions like sodium, potassium, and calcium are charged and are repelled by the cell membrane. Amino acids and nucleic acids are polar and too large to cross the cell membrane. Also, the water movement across the membrane...
facilitated diffusion can be defined as the passive movement of molecules across the cell membrane from a region of higher concentration to a region of lower concentration by means of a carrier molecule. q6 6. provide an example of facilitated diffusion. in the human body, glucose molecules, ...
We use the term Botox to refer to all of them, just how we use the brand name Kleenex to refer to all facial tissues. The different brands act mostly the same as each other, but there are some subtle differences that are important to understand. The primary active molecule—botulinum toxi...
Molecule forms can offer solid or gaseous, liquid. Molecular object with the translation exercise, there turning and molecular atoms inside various types of vibration. 翻译结果4复制译文编辑译文朗读译文返回顶部 Terrorists can take the form of gaseous, liquid or solid. Shihtan movement elements in add...
By this mechanism the excited dye molecule regenerates and the whole process can start again. 24.3.3.2.2 Polymer Solar Cells Many different types of polymer solar cells can be fabricated depending on the cell structure. Although every structure has different advantages and disadvantages, most ...
The artificial life created by humans is formed by the movement of molecules (rational as well as vibrational) having the transitions with molecules or atoms. An atom or molecule gets excited and enters a state which is considered absorbing, while it can be said as entering an emitting state ...
UniportTransport Proteins — Only one type of molecule is moved via a transport protein. Movement can be either into or out of the cell/organelle. SymportTransport Proteins — Two types of molecules are moved in the same direction (either both are moved into the cell/organelle or both are ...
Explain how different cells that have identical intracellular steroid hormone receptors can activate different genes when the receptors bind the same signal molecule. Explain how the term "resistance" relates to neurons. Why do skeletal muscle cells need so many nuclei? How ...
Active Transport is the movement of molecules from a region of lower concentration to a region of higher concentration with the use of energy.
The DNA structure can be thought of as a twisted ladder. This structure is described as a double-helix, as illustrated in the figure above. It is a nucleic acid, and all nucleic acids are made up of nucleotides. The DNA molecule is composed of units called nucleotides, and each nucleotide...