D- both involve moving substances across a membrane
Reasoning:
-Active transport moves against the concentration gradient ( low to high)
-Passive transport moves higher to lower concentration
The answer is: Motor neurons
Answer:
I'd say C, The main different between cellulose, and starch is the function they preform in plants.
Explanation:
I've done some research to find that starch and cellulose do compose of different parts of the plant, and that starch repeats glucose units oriented in the same direction, while cellulose repeats glucose units 180° around the axis of the polymer backbone chain. Of course we know photosynthesis produces glucose, and oxygen from co2, light energy, and h20. Which means that they both have the same monomer. Since cellulose and starch are polymers of the monomer glucose, A can't be right. They are said to have the same size because the only difference is how the repeat of the glucose monomers are oriented differently so this does not exactly change its relative size, so B can't be right. Starch has alpha linkages while Cellulose has beta linkages. This means they have a different structure which can affect the function. Also, the function of cellulose is a Structural polysaccharide(cause it is part of the walls of the plant), while starch is a Storage polysaccharide (cause sugar=energy).
The correct answer is A. "A sperm cell and an egg cell combine to form an embryo."
