The diffusion of water molecules across a selectively permeable membrane is called
A) facilitated diffusion.
B) exocytosis.
C) active transport.
D) osmosis.
E) hydrolysis.
D
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Answer the following statements true (T) or false (F)
1. Stem cells have determinate cleavage. 2. Very great differences in body form can result from only small differences of gene expression. 3. Radiata have neither an anterior end nor a posterior end. 4. All eumetazoans have cell junctions. 5. Gastrulation is brought about by an invagination of the wall of the blastocoel.
List the three factors required for gene therapy, and explain the difference between ex vivo and in vivo gene therapy
What will be an ideal response?
Secondary succession is likely to occur in
a. a burned forest. b. a shallow lake. c. an abandoned field. d. a burned forest and a shallow lake. e. a burned forest, a shallow lake, and an abandoned field.
Which of the following are used to generate biofuels?
a. single-celled algae b. crop plants c. multicellular algae d. any plants