Plasmodesmata permit cell-to-cell communication in plants. Similar structures found in animals are:
A) cell walls.
B) lysosomes.
C) mitochondria.
D) vacuoles.
E) gap junctions.
Answer: E
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Signal transduction
A. is the relay of information about conditions outside a cell to inside the cell. B. often relies on a two component system. C. may involve phosphorylation of various molecules. D. is used by certain pathogens to sense low magnesium conditions. E. All of the choices are correct.
Type 1 fucosidosis is a rare human disease. Patients cannot hydrolyze the disaccharide fucose, and as a result have severe neurological decline and die by age 6. The disease is due to a defect in the gene that encodes the lysosomal enzyme that breaks down fucose (?-1-fucosidase), and is inherited in an autosomal recessive manner. Jane and John have a child who has Type 1 fucosidosis. What is
the probability that their next child will also have the disease? A. No chance B. 1/4 C. 1/2 D. 3/4 E. 4/4 or 100%
X inactivation in calico cat fur results in ________________.
A. formation of secondary male characteristics B. mosaic hair color in females C. mosaic hair color in males D. hairless phenotype E. all-white hair color
What is the name of a normal gene that serves to promote cellular division?
A) post-oncogene B) cancer gene C) oncogene D) proto-oncogene