Tryptophan must be ______ when tryptophan repressor molecules are inactive.

A. Present
B. Absent


Answer is B. Absent

Biology & Microbiology

You might also like to view...

Proteins that bind to acetylated lysine residues in the histone tail contain:

A. bromodomains. B. DNA-binding domains. C. chromodomains. D. kinase domains. E. histone-fold motifs.

Biology & Microbiology

In the absence of environmental sources of water, such as precipitation or condensation, how would water get into the pitcher of a carnivorous plant?

A. through the phloem B. from the fruit C. from the cuticle D. through the xylem E. from the leaves

Biology & Microbiology

Glycolysis takes place in ____

a. the cytoplasm b. mitochondria c. chloroplasts d. thylakoids e. peroxisomes

Biology & Microbiology

Microbial decomposition of organic matter results in NH4+ production through a process called ________

Fill in the blank(s) with correct word

Biology & Microbiology