To produce organic matter from inorganic matter, energy is needed. Miller's experiment provided two sources of energy. They were
A. ultraviolet light and heat.
B. heat and electric sparks.
C. electric sparks and ultraviolet light.
D. None of these answers is correct.
B. heat and electric sparks.
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In an Hfr X F- conjugation, ____
a. the Hfr cell can lose chromosomal genes that it transfers to the F- cell b. the donor cell can become a partial diploid
c. plasmid DNA is transferred from the Hfr cell to the F- cell d. chromosomal DNA can be transferred from the F- cell to the Hfr cell e. chromosomal DNA can be transferred from the Hfr cell to the F- cell
The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is called
A) interphase. B) prophase. C) metaphase. D) anaphase. E) telophase.
Changes in sediment distribution can be attributed to all except:
a. currents. b. burrowing animals. c. feeding activity of predators. d. temperature - salinity shifts.
Which of the following genetic changes cannot convert a proto-oncogene into an oncogene?
(a) A mutation that introduces a stop codon immediately after the codon for the initiator methionine. (b) A mutation within the coding sequence that makes the protein hyperactive. (c) An amplification of the number of copies of the proto-oncogene, causing overproduction of the normal protein. (d) A mutation in the promoter of the proto-oncogene, causing the normal protein to be transcribed and translated at an abnormally high level.