In the life cycle of bryophytes, which of the
following dominates?
a. gametophyte stage
b. sporophyte stage
c. haploid stage and sporophyte body
d. diploid stage and gametophyte body
e. the gametophyte and the sporophyte bodies
both dominate
A
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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. Which of the following statements is ACCURATE about Type1
fucosidosis? A. Ff and ff individuals will have the disease B. Ff individuals will have the disease, because anyone with the mutant allele will have the disease C. Ff individuals make enough ?-1-fucosidase to break down fucose and do not exhibit the condition D. Two carriers for Type I fucosidosis have no chance of having a normal child E. Both Ff individuals will have the disease, because anyone with the mutant allele will have the disease AND two carriers for Type I fucosidosis have no chance of having a normal child
If a mutation prevented the formation of lignin, which tissue would be most affected?
a. vascular cambium b. parenchyma c. collenchyma d. sclerenchyma e. mesophyll
Allosteric inhibition generally results from
a. excess substrates. b. binding of regulatory molecules at sites other than the active sites. c. a change in the temperature of the system. d. a lack of coenzymes. e. changes in pH
The ________ is the selective barrier of a root that determines which substances pass between the cortex and vascular tissue
A) epidermis B) endodermis C) cuticle D) xylem