There are no cases of -XX or Y individuals, but X individuals do exist. Propose an explanation for this statistic.What will be an ideal response?
ANSWER: Embryos without an X chromosome are not observed in miscarriages; these must be
eliminated early in development—perhaps even before pregnancy is recognized. At least one
copy of an X chromosome is essential for survival. The most likely explanation is that the X
chromosome contains the majority of genes that encode for human development and that the
Y chromosome is primarily the carrier of genes responsible for development into a male.
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Nitrogen-fixing bacteria convert __________ to
__________. a. gaseous nitrogen; ammonia b. ammonia; gaseous nitrogen c. gaseous nitrogen; nitrates d. gaseous nitrogen; nitrites e. ammonia; nitrates
The underlying problem with Gaucher diseases is ___
A. the spontaneous breakdown of red blood cells B. the accumulation of fat in white blood cells C. the breakdown of the myelin sheath around nerves D. a hypertrophied spleen E. the lack of critical liver enzymes
The ________ is the organelle involved in the post-translational modification of proteins and sorting of proteins to various intracellular and secretory compartments
Fill in the blank with correct word.
The smooth endoplasmic reticulum
a. is the site where lipids destined for other cellular compartments are manufactured. b. produces the energy needed to run chemical reactions in the cell. c. converts sunlight into chemical energy. d. stores water, nutrients, and enzymes.