How do negative regulators such as the Lac repressor prevent RNA polymerase from initiating transcription?
A) by blocking the ribosome binding site
B) by forming a loop in the operator that restricts the passage of the polymerase
C) by physically blocking the DNA binding site of RNA polymerase
D) by binding to the polymerase to inhibit its catalytic activity
C) by physically blocking the DNA binding site of RNA polymerase
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When (+) and (-) strains of the Zygomycete Rhizopus stolonifer meet, ________
a. they each release haploid spores which fuse to form a diploid mycelium b. they cannot mate because they are incompatible strains c. their hyphae fuse to form a diploid zygospore d. they compete for available resources
The appearance of _____ on Earth due to the action of photosynthetic bacteria occurred about 2.7 billion years ago
a. water b. carbon dioxide c. ATP d. oxygen e. iron
Lactation is stimulated by the hormone LH.
a. true b. false
Members of the Domain Archaea are characterized by all of the following except:
a. Carry out unusual metabolic processes b. Contain distinctive ribosomal RNA c. Contain nuclei d. Live in extreme environments