Which type of metabolism is unique to prokaryotes?

a. chemoheterotroph
b. photoheterotroph
c. photolithotroph
d. photoautotroph


Ans: b. photoheterotroph

Biology & Microbiology

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Imagine that a mad scientist was able to successfully travel 2 billion years back in time and modified the environment so that photosynthesis and respiration were completely coupled

(e.g., there was no "leakage" of products from respiration or photosynthesis). How would this affect Earth's present-day atmosphere, if at all? A. Earth's atmosphere would be unaffected. B. Atmospheric O2 levels would increase. C. Atmospheric O2 levels would decrease. D. Atmospheric CO2 levels would increase, but O2 levels would be unaffected. E. Atmospheric O2 levels would increase, but CO2 levels would be unaffected.

Biology & Microbiology

In humans, heritability of clubfoot is 0.8. This means that expression of this condition is

A) strongly influenced by environmental factors. B) solely dependent on inheritance of the clubfoot gene(s). C) strongly dependent on inheritance of the clubfoot gene(s) but also influenced by environmental factors. D) inherited from an affected parent 80% of the time.

Biology & Microbiology

Which of the following plants are widely

planted in cities because of their resistance to air pollution?

a. lycopods b. ginkgos c. cycads d. conifers e. grasses

Biology & Microbiology

In a dihybrid cross with independent assortment of the two genes, any deviation from the Mendelian 9:3:3:1 ratio indicates that the phenotype is the product of the interaction of two or more genes

Indicate whether the statement is true or false

Biology & Microbiology