Reproductive cloning of human embryos is generally considered unethical. However, on the subject of therapeutic cloning there is a wider divergence of opinion. Which of the following is a likely explanation?
A) The use of adult stem cells is likely to produce more cell types than the use of embryonic stem cells.
B) Cloning to produce embryonic stem cells may lead to great medical benefits for many.
C) Cloning to produce stem cells relies on a different initial procedure than reproductive cloning.
D) A clone that lives until the blastocyst stage does not yet have human DNA.
B
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Which of the following does not describe an aspect of the Human Genome Project?
A. Overlapping clones from YAC and BAC libraries were identified by hybridization and organized into long contiguous stretches called contigs. B. Landmark sequences on the contig called sequence tagged sites (STS) were used to aid in ordering the contigs. C. Landmark sequences on the contig called expression sequence tags (EST) were used to aid in ordering the contigs. D. The contigs were sequenced using a shotgun method, and the resulting sequences were assembled by computer. E. All of these choices describe aspects of the Human Genome Project.
The pituitary gland secretes ______ during the alarm reaction.
a) corticosteroids b) neurotransmitters c) CRH d) ACTH
When a farmer grows cotton containing the gene for Bt toxin, they often leave a strip of non-Bt cotton around the outside of the field for what reason? Select one:
a. to allow some rr bollworm caterpillars to survive b. to allow the non-Bt and Bt cotton plants to cross pollinate c. because the non-Bt cotton does not drive the moths and caterpillars to extinction d. because the non-Bt cotton grows better e. to allow some RR bollworm caterpillars to survive and limit selection pressure for resistance
Ferns often have small bumps called sori arranged in rows on their undersides. What are these structures?
A) Spore capsules B) Seed capsules C) Nodules containing symbiotic bacteria D) Parasites