The main purpose of preparing karyotypes is ____
A. to reveal chromosome abnormalities
B. to determine gender
C. to determine which genes are on which chromosomes
D. to isolate and analyze genes
E. all of these
A
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Chromosomes are in a condensed form at which stage(s) of the cell cycle?
a. prophase only b. prophase and metaphase c. interphase d. all stages of interphase and mitosis e. throughout mitosis until late telophase
Materials in sedimentary cycles
a. pass through both a solid and a gaseous phase. b. are never present as gases in the ecosystem. c. are present as liquids in the earth but as gases in the atmosphere. d. are most abundant in the atmosphere. e. cycle relatively quickly through ecosystems.
In 1964, Nirenberg and Leder used the triplet binding assay to determine specific codon assignments. A complex of which of the following components was trapped in the nitrocellulose filter?
A) ribosomes and DNA B) sense and antisense strands of DNA C) free tRNAs D) charged tRNA, RNA triplet, and ribosome E) uncharged tRNAs and ribosomes
A given enzyme works on
A. any number of different substrates. B. one of two possible substrates. C. no substrate. D. one type of substrate.