Which of the following statements is true of bacterial plasmids?
A. They are always found in the nucleoid.
B. They can replicate autonomously.
C. They carry genes for essential metabolic functions.
D. They are small circular DNA molecules.
E. They are small circular DNA molecules that can replicate autonomously.
Answer: E
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Indicate whether the statement is true or false
Tobacco smoke:
a. exposes the smoker to less than 10 carcinogens b. presents more of a risk to male smokers than to female smokers c. takes a long time to manifest in a decrease of respiratory function d. increases respiratory infections e. increases carbon dioxide blood levels but decreases carbon monoxide blood levels
The ______ body is used to package and ship components to other organelles and out of the
cytoplasm. Fill in the blank(s) with the appropriate word(s).
Minick Rosing's analysis of microscopic globules of carbon found in rocks 3.7 billion years old showed that they were somewhat higher in 12C as opposed to 13C. This is significant because ________
A) 13C radiometrically decays into 12C, which lets us calculate the age of these rocks B) life could not have arisen in an environment with excessive 13C C) these carbon globules contain visible remains of cell walls and nuclei D) living things that fix carbon preferentially incorporate 12C over 13C E) meteorites must have brought 13C to the early Earth