If you could stop diffusion of substances in fruit fly zygotes, could you stop normal development? Why or why not?
What will be an ideal response?
Yes. Morphogens must diffuse from where the nurse cells deposit the morphogen mRNA. It is the diffusion gradient of high to low concentration that imparts positional information to cells. If all of the morphogens stayed at the anterior end, no "center" of the organism would exist–only anterior and posterior would exist. Normal organogenesis would not occur.
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The primary difference between active transport and facilitated diffusion is that active transport is the only one in which
A) [S]high ? [S]low. B) transporter proteins are required. C) [S]low ? [S]high. D) the concentration gradient provides the necessary energy for movement. E) only water molecules move.
Which of the following is an early warning sign of colorectal cancer?
a. GERD b. celiac disease c. diarrhea d. colon polyps e. diverticulitis
According to this graph, which of the following shows the correct relationship between cell type numbers of the two groups listed?
a. Hominidae < Aves c. Cnidaria < Porifera b. Cephalopoda < Actinopterygii d. Amphibia < Echniodermata
Indicate whether the following statements are true or false. If the statement is false, explain why it is false
A. Membrane components in the cell are made in the endoplasmic reticulum. B. The Golgi apparatus is made up of a series of membrane-enclosed compartments through which materials destined for secretion must pass. C. Lysosomes are small organelles where fatty acid synthesis occurs.