Environmental cues that influence the timing of reproduction generally do so by _____
A) increasing the body temperature
B) providing access to water for external fertilization
C) increasing ambient temperature most favorable for sex
D) direct effects on hormonal control mechanisms
D
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A distinguishing characteristic of actinomycetes that can be used to classify these organisms is the types of sugars found in extracts of the organisms.
Answer the following statement true (T) or false (F)
Which of the following is the least likely mechanism for reducing the rate of gene transcription by a repressor?
A. The repressor binds directly to the RNA polymerase to block the closed-to-open transition at initiation. B. The repressor induces a conformational change in the polymerase that accelerates the closed-to-open transition. C. The binding of the repressor sterically occludes binding of the RNA polymerase to the promoter. D. The repressor binds directly to the DNA to stabilize the closed complex over the open complex.
How do mosses help prevent soil erosion?
a. Mosses absorb the majority of running water. b. Mosses have no role in soil formation or erosion. c. Mosses provide an additional habitat to soil organisms. d. Mosses have roots that create a lattice beneath the soil. e. Mosses are packed in dense colonies, holding soil together
What type of immunity is produced by the body when a person contracts a disease?
A. innate immunity B. naturally acquired passive immunity C. artificially acquired active immunity D. artificially acquired passive immunity E. naturally acquired active immunity