The most vulnerable organisms to the effects of DDT
are
a. producers.
b. herbivores.
c. primary carnivores.
d. decomposers.
e. top carnivores.
Answer: e
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Cells capable of producing all the various types of cells of the adult are called ____ cells
a. semipotent
b. pluripotent c. totipotent d. multipotent e. differentiated
During the cardiac cycle, when a heart chamber is relaxed, it is in ____________________ and when it is contracting, it is in ____________________
Fill in the blank(s) with correct word
To answer questions 72–75 refer to the five items listed below:a
restriction enzymes b. recombinants c. plasmids d. clones e. restriction sites M 72. These are bacterial populations containing thousands or millions of identical copies of one to several genes. D 73. The use of the techniques of genetic engineering to move a novel or foreign piece of DNA into the DNA of an organism produces DNA __________. M 74. The pieces of DNA that are moved by a genetic engineer from one organism to another are first incorporated into these. E 75. The function of these is to cut apart foreign DNA molecules.
In flowering plants, the unfertilized ovule contains the
A) embryo. B) endosperm. C) female gametophyte. D) stigma. E) pollen grain.