Which of the following was demonstrated by the Miller-Urey experiment?
A. Life began on the prebiotic Earth 3.5 billion years ago.
B. Life began in the oceans.
C. Life can be started experimentally in the laboratory.
D. Organic molecules important to life could have been formed from a vast array of simple chemicals.
Answer: D
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In the Watson-Crick model of DNA structure, the polynucleotide chains are
A. of unequal length. B. both oriented in the same direction. C. arranged with the bases on the outside. D. built with the nucleotides as the backbone. E. oriented in opposite directions.
The preinitiation complex forms in bacteria when the start codon is recognized through binding of 16srRNA and what region of mRNA?
What will be an ideal response?
The cells of a gametophyte are
A) tetraploid. B) haploid. C) triploid. D) diploid. E) unable to divide by mitosis.
The owners of a local bakery ask for your help in improving a special yeast strain they use to make bread
They would like you to help them design experiments using RNA interference to turn off genes, to allow them to test their hypothesis that certain genes are important for the good flavors found in their bread. Of the components in the following list, which is the most important to check for in this yeast strain if you'd like this project to succeed? (a) the presence of foreign double-stranded RNA (b) the presence of genes in the genome that code for RISC proteins (c) the presence of miRNA genes in the genome (d) the presence of single-stranded siRNAs within the cell