Classification.Choose the proper item below for the following statements.

A. This contains regulator, promoter, and operator regions
B. A repressor protein can shut down transcription by binding here
C. When the repressor is inactivated, RNA polymerase can bind here and allow transcription to occur
D. Used in allosteric regulation of the lac operon
E. Repressors, activators, and transcription factors


A. Operon
B. Operator
C. Promoter
D. Repressor protein
E. Regulator protein

Biology & Microbiology

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A female who is heterozygous for hemophilia will

a. exhibit the condition throughout her life. b. suffer from bleeding when severely stressed. c. show no signs of the disease at all. d. pass the gene on to all of her children. e. pass the gene on to only her sons.

Biology & Microbiology

To remove noncoding sequences in the pre-mRNA of eukaryotes, multiple snRNPs combine with proteins to form a larger complex called the ________.

A. spliceosome B. introsome C. 3' poly-A tail D. 5' cap E. ribosome

Biology & Microbiology

All of the following represent anchoring junctions EXCEPT

A. tight junctions. B. focal adhesions. C. desmosomes. D. adherens junctions. E. hemidesmosomes.

Biology & Microbiology

In double-stranded polynucleotides, paired nitrogenous bases are said to be __________

a. homologous b. analogous c. complementary d. parallel e. antiparallel

Biology & Microbiology