During the initiation of nitrogen-fixation nodules, the Rhizobium bacteria release what type of molecules to signal the host plant?
A. Nod factors
B. flavonoids
C. sugars
D. transcription factors
E. proteins
Answer: A
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Some alleles in the heterozygous state are beneficial, whereas in the homozygous state they are harmful
A. true B. false
Which statement about gene mutations is FALSE?
a. All mutations are transmitted to the next generation. b. Mutations are rare but their rates can be predicted. c. Mutations with beneficial effects will be favored by natural selection. d. Many mutations reduce an individual's chance of surviving and reproducing. e. Mutations with neutral effects neither help nor hurt the individual.
ATP synthesis that involves phosphorylation events linked to O2-dependent electron transport is called ________
Fill in the blank with correct word.
Sponges are believed to have arisen from the choanoflagellates because they possess:A
amebocytes. B. spicules. C. spongin. D. collar cells. E. oscula.