Answer: This is because all of the cells in our bodies start from a single fertilized egg. With few exceptions, all cells in a person's body have the same DNA and genes. As cells divide and grow different genes are expressed, resulting in different cell types.
Answer:
Usually, the hottest is at the bottom, if the kettle is on top of a heating ... Also, there's a factor that's not so important for kettles, but otherwise can be ... When a phase change (like liquid to gas) occurs, it normally begins at a location that ... a slight disturbance (like putting in a spoon or some sugar, or moving it ..
Explanation:
Answer:
1 and 2
Explanation:
1) The exercise scientist is looking for the effects of a chemical between an apple crop to which it is administered and another to which it is not, 4 options are presented, of which it is essential to count as a variable the amount of water each Orchard and tree species in the orchard, since they can generate alterations in the results, the other two variables of the exercise such as number of apples and size of the orchards are not significant and their variations do not affect the scientist's objective.
Answer:
D) Transport of sodium ions down their electrochemical gradient facilitates the transport of glucose against its concentration gradient.
Explanation:
Active transport refers to the movement of molecules across biological membranes against a concentration gradient. Active transport can be divided into 1-primary active transport, which requires energy from the hydrolysis of adenosine triphosphate (ATP); and 2-secondary active transport, which requires an electrochemical gradient generated by pumping ions in/out of the cell. The case above described represent a type of secondary transport active because the movement of sodium (Na) ions is used as energy source to move glucose molecules against their concentration gradient.
1) All living organisms are composed of one or more cells.
2) The cell is the most basic unit of life.
3) All cells arise from pre-existing, living cells.
