Although Dolly was only three years old, her chromosomes had the length of a 9-10 year old sheep. Which of the following best describes why this occurred?
A. The cell lines that created Dolly were aged prematurely in the lab
B. Nonhomologous recombination
C. A mutation enhanced the rate of aging
D. Dolly was not a clone
E. The telomeres of the somatic cells that Dolly originated from were shortening
E
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Physiological responses to chronic stress interfere with ________
a. cardiovascular function only b. the immune system only c. growth only d. all of the choices
Why don't corneal transplants (in the eye) provoke an immune response?
a. corneas are not cellular structures b. corneal cells secrete a chemical to trigger apoptosis in attacking lymphocytes c. lymphocytes recognize all corneas as "self" d. there are no lymphocytes in the eye e. corneal cells resemble lymphocytes
The pectoral girdle is composed of the ________, or shoulder blades, and the collarbones
Fill in the blank(s) with correct word
The blastocyst attaches to the ________ about 6 days after fertilization and begins to digest its way inward
Fill in the blank(s) with correct word