Mutations in the lacI and lacO genes of the lac regulatory system in E. coli often lead to full transcription of the three structural genes, even when no lactose is available to the organism. Such mutations would be called ________
Fill in the blank(s) with correct word
constitutive
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The male pine cone
(a) produces pollen. (b) contains a female gametophyte. (c) bears a megasporangium containing a megaspore mother cell. (d) gives rise to a seed.
Which of the following occurs during recombination?
a. Homologous chromosomes exchange linear segments of genetic material. b. One gene interferes with the expression of another gene. c. Identical alleles are expressed simultaneously in a heterozygote. d. The gene order of homologous chromosomes is significantly altered.
Plants having naked seeds out in the open are
A. gymnosperms. B. annuals. C. angiosperms. D. flowering.
Brown and Goldstein discovered the mechanism of cholesterol uptake by studying fibroblasts from children with which disease?
a. Chronic fatigue syndrome b. Familial hypercholesterolemia c. Lupus erythematosis d. Cystic fibrosis