Experiments by Stanley Miller in the 1950s demonstrated that the first organic molecules on earth
A) were nucleic acids such as RNA and DNA.
B) most likely formed in an extraterrestrial environment and were deposited on earth via asteroids.
C) could have formed abiotically in a reducing atmosphere containing hydrogen, methane, ammonia, and water vapor.
D) were catalysts composed of simple amino acids.
E) were catalysts composed of simple amino acids and most likely formed in an extraterrestrial environment and were deposited on earth via asteroids.
Answer: C
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Certain plants have been genetically modified to secrete citrate, which helps
A. make the phosphate in soils more soluble. B. plants make necessary micronutrients. C. reveal mineral deficiencies in a plant. D. make hydroponic growth possible. E. plants add metals to the soil in which they are growing.
Which structure consists of two lipid bilayers folded together as a single membrane?
a. cell wall b. cell membrane c. nuclear envelope d. ribsome e. Golgi body
Mitochondria likely arose from _________ and chloroplasts likely arose from _________
Fill in the blank(s) with correct word
Knockout experiments involving __________ genes in fruit flies (Drosophila melanogaster) revealed local controls
over gene expression. Fill in the blank(s) with the appropriate word(s).