What would be the phenotype of a null mutation in the gene encoding Lac repressor?
A) constitutive expression of the lac operon
B) inducible expression of the lac operon
C) permanently repressed expression of the lac operon
D) cannot predict what would happen to expression of the lac operon
A) constitutive expression of the lac operon
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If the parents of a child have the following genotypes [Bb ´ Bb], what is the probability that they will have a child with the genotype [Bb]?
A. 100% B. 50% C. 25% D. 0%
Gene sequencing defines the order of
A.) DNA nucleotides in genes or genomes. B.) genes on chromosomes. C.) chromosomes in an organism's genome. D.) amino acids in proteins.
Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?
A. Franklin B. Chargaff C. Hershey and Chase D. Meselson and Stahl E. Watson and Crick
Between the organs and the body wall, complex animals have a body cavity called a
A) mesoglea. B) coelom. C) mesoderm. D) thorax. E) cnidarian.