A similarity between regulation of the lac operon in bacteria and the regulation of galactose utilization in yeast is that both pathways
A) transcribe all the genes necessary as one polycistronic mRNA.
B) use feedback inhibition to stop making their sugars.
C) use a modified version of their sugars as inducers.
D) are subject to catabolite repression.
E) C and D only
E
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The energy released in the mitochondrial electron transport chain is used to transport proteins into the.
A. mitochondrial matrix. B. cytoplasm. C. endoplasmic reticulum. D. intermembrane space of the mitochondria. E. nucleus.
How do marine polychaetes use chitin hardened body parts?
a. as an excretory organ b. the chitin hardened tentacles, to move sand c. to chew and digest prey d. the chitin-hardened jaws, to capture prey e. the chitin-reinforced bristles, for movement and chitin hardened jaws to capture prey
Nonsteroid hormones bind to a receptor on the cell membrane of target cells but do not actually enter the target cells.
a. true b. false
The carbon atoms in organic compounds typically form ________ with other atoms
A) nonpolar covalent bonds B) polar covalent bonds C) ionic bonds D) hydrogen bonds E) either ionic or hydrogen bonds