Where is primary growth occurring in an old tree?
A) Nowhere; trees more than a year old have only secondary growth.
B) closest to ground level at the base of the tree
C) in young branches where leaves are forming
D) where the vascular cambium and cork cambium are located
C
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A scientific ________ must be so thoroughly confirmed that virtually no doubt remains about its accuracy.
Fill in the blank(s) with the appropriate word(s).
Which of the following procedures are possible
with genetic engineering?
a. express a human gene in a bacterium b. transfer a human protein into a sheep c. transfer a human genome into a bacterium d. express a human amino acid in a mouse e. all of these
Most organ transplants fail because
a. of poor vascular connection between host and donor tissue. b. the migrating leukocytes attack the tissue adjacent to the transplant. c. cytotoxic T cells enter the transplant through the connecting blood vessels and kill the individual transplant tissue. d. introduced tissues produce antibodies that cause a massive reaction. e. of all of these.
Which one of the following is NOT a way that invasive (alien) species are introduced into a new habitat?
a) unintentionally introduced during transport of crops b) intentionally introduced by humans c) unintentionally introduced in packaged, processed foods d) unintentionally introduced during discharge of ship ballast tanks e) natural introductions on the feet, wings, or fur of migrating organisms