In DNA replication, _______________________ pairs with thymine, and cytosine pairs with _______________________.
adenine, guanine
guanine, adenine
cytosine, thymine
purine, alanine
none of the answer choices are correct
adenine, guanine
adenine, guanine
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How does the lactose repressor block transcription of the lactose operon?
a. by "turning off" the appropriate genes in the intron b. by regulating the activity of the enzymes that the operon codes for c. by binding allosterically to the appropriate genes d. by slowing the uptake of lactose into the cell e. by binding to the operator
Calcification zone
What will be an ideal response?
Although most of the estrogen and testosterone produced in the human body is made by the ovaries and testes, respectively, small amounts of these hormones are also produced by the ________
Fill in the blank(s) with correct word
The members of the supergroup Archaeplastida that have cell walls impregnated with calcium carbonate and help build coral reefs are the
A. multicellular green algae. B. dinoflagellates. C. brown algae. D. diatoms. E. red algae.