The atmosphere and seas of the early Earth lacked oxygen. What kind of organisms could NOT have lived under those conditions?
A. chemoautotrophs
B. obligate anaerobes
C. cyanobacteria
D. obligate aerobes
E. facultative anaerobes
Answer: D
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The epsilon (?) subunit of DNA polymerase III of E. coli has exonuclease activity. How does it function in the proofreading process? The epsilon subunit _____
A) removes a mismatched nucleotide B) excises a segment of DNA around the mismatched base C) can recognize which strand is the template or parent strand and which is the new strand of DNA. D) adds nucleotide triphosphates to the end of the growing DNA strand
Why do prokaryotes not conduct the process of the citric acid cycle?
a. They do not possess mitochondria. b. They do not possess a cytoplasm. c. They do not possess a Golgi body. d. They do conduct the citric acid cycle.
Which enzyme breaks down polysaccharides?
a. sucrase b. amylase c. maltase d. lactase
Why is pollen considered an important adaptation to land?
What will be an ideal response?