Which of the following is needed to form recombinant DNA?
A. helicase
B. Taq polymerase
C. primase
D. DNA ligase
E. topoisomerase
D
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In seed plants the embryo develops inside the seed, which allows for:
A. less dispersal of the sporophyte generation. B. the development of dormancy. C. the dominance of the gametophyte generation. D. nutrient reserves for the developing embryo. E. greater protection for the developing embryo. F. the development of dormancy as well as nutrient reserves and greater protection for the developing embryo.
Which internal defense patrols the body and can kill cancerous cells?
a. NK cells b. interferons c. lymphocytes
Which forms the outermost whorl of flower parts?
a. sepals b. petals c. anthers d. pistils e. stamens
When a protein denatures, what happens to it?
a. it becomes a functional protein b. it combines with sugars to become a signaling protein c. it changes its shape and to assume another function d. it unwinds and loses its three dimensional shape e. it is transported out of the cell