Four of the following statement about protocells are true. Which statement is false?
A. They are simple membrane-bound sacs.
B. They contain DNA.
C. They are able to engage in metabolism.
D. They are able to reproduce.
E. They are able to capture energy.
Answer: B
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Epigenetic modifications affect the nucleotide sequence of the DNA
a. True b. False Indicate whether the statement is true or false
A defect in which of the following systems leads to granulomatous disease?
A. lymphatic system B. circulatory system C. oxidase system D. Golgi system
Compared to the air a person inhales, the air that they exhale has
A. higher concentrations of both O2 and CO2 . B. a lower concentration of O2 and a higher concentration of CO2 . C. a higher concentration of O2 and a lower concentration of CO2 . D. lower concentrations of both O2 and CO2 . E. equal amounts of O2 and CO2.
Which of the following best illustrates ecological succession?
a. overgrazing causes a nutrient loss from soil b. grass grows on a sand dune, is replaced by shrubs, and then by trees c. introduced pheasants increase, and native quail populations disappear d. decomposition in soil releases nitrogen that plants can use e. a mouse eats seeds, and an owl eats the mouse