Huntington Disease is inherited in humans as an autosomal dominant gene. Affected individuals show progressive brain deterioration from cell death in the cerebral cortex. Onset of the disease usually occurs between ages 30 and 50
Give two possible reasons for the observed variation in the age of onset of this disease.
variable genetic background, internal physiological environment, external environment
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A unique feature of the red algae life cycle is the occurrence of four multicellular stages: two sporophytes, a female gametophyte, and a male gametophyte
Indicate whether the statement is true or false
Which of the following chemicals has five
carbon atoms? a. phosphoglycerate (PGA) b. ribulose bisphosphate (RuBP) c. phosphoglyceraldehyde (PGAL) d. glucose e. none of these
Because embryonic stem cells can form any tissue in the human body, they are termed ____________________; adult stem cells, on the other hand, are ____________________, since they can only form a limited number of cells types. Fill in the blank(s) with the appropriate word(s)
In an inducible operon, the ____ is the molecular switch that controls gene expression, while the ____ is the DNA region where RNA polymerase binds to begin transcription
a. repressor; inducer b. inducer; repressor c. operator; promoter d. promoter; operator e. lactose; promoter