When exploring the Universe, looking for life, most scientists agree we should look for “carbon-based life forms.” Why is carbon considered so important to life?
a. Carbon atoms are a minor but very important component in lipids which are needed for life.
b. The Carboniferous Period is a geological period on Earth when carbon was very prevalent. It is believed that all planets with life must pass through this period.
c. The carbon atom’s ability to form four covalent bonds to as many as four different atoms makes it a fundamental structural component in the organic macromolecules.
d. Carbon atoms make matter that burns readily, and it is believed that life could not develop without fire.
c. The carbon atom’s ability to form four covalent bonds to as many as four different atoms makes it a fundamental structural component in the organic macromolecules.
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Where does the process of transcription initiate?
A. Promoter B. Terminator C. Regulation sequences D. Transcription factors
The greatest number and variety of indigenous microflora of the human body live in or on the:
A) colon. B) genitourinary tract. C) mouth. D) skin.
The segmented worms of the phylum Annelida
a. have an open circulatory system. b. possess setae on each segment. c. are acoelomate. d. move by use of flagella. e. display radial symmetry.
In poultry, the genes for rose comb (R) and pea comb
(P) produce walnut whenever they occur together (R__ P__); single-combed individuals have the homozygous condition for both genes (rr pp). (a) Give the F1 and F2 phenotypic results of a cross of a pure-breeding rose comb (RR pp) with a pure-breeding pea comb (rr PP). (b) Give the phenotypic results of a cross of Rr Pp x rr Pp. (c) Give the phenotypic results of a cross of RR Pp x rr Pp. (d) Give the phenotypic results of a cross of Rr pp x rr Pp. (e) Give the phenotypic results of a cross of Rr Pp x rr pp. What will be an ideal response?