Explain the relationship between ozone depletion and rising incidence of skin cancer.
What will be an ideal response?
The layer of ozone surrounding the earth shields us from the sun's harmful ultraviolet rays. The UV rays are mutagenic, triggering changes in the DNA of our skin cells, giving rise to cancer. With less ozone, more UV rays hit the earth. If we continue to sunbathe and expose our skin, cancer rates will continue climbing.
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The Stramenopila are a very large and diverse group that all possess ________ at some point in their life cycle.
A. chloroplasts B. a macronucleus C. an exoskeleton D. heterokont flagella
The vascular bundles inside a typical eudicot stem are arranged in a characteristic ring, which divides the stem’s
ground tissue into the ____ (inside the ring) and the ____ (outside the ring).
a. cortex; pith b. pith; cortex c. pith; cambium d. cambium; cortex e. cortex; epidermis
Which of the following choices best describes therapeutic cloning?
1.The nucleus from a somatic cell is transferred into an enucleated egg, which divides in culture, forming an inner cell mass of embryonic stem cells. 2.A human gene is inserted into a retrovirus and transferred into a patient's white blood cells to correct a disorder. 3.Totipotent cells from early embryos are propagated in culture and transferred into patients to treat disease. 4.Germ cells of individuals with genetic disorders are targeted for gene transfer to repair the mutated gene.
What are the three main functions of the stomach?
What will be an ideal response?