According to most theories about the evolution of early life on earth, the atmosphere had an abundance of ammonia, methane, and carbon dioxide, shown above. free energy from lightning could have allowed chemical reactions to occur that generated the precursors to life on earth. which inorganic molecule(s) are accurately paired with their role in the formation of organic molecules necessary to life?
a) ammonia would have provided the nitrogen found in the amine groups of amino acid and the nitrogenous bases in dna.
b) methane would have provided the hydrogen to form water, a universal solvent for chemical reactions supporting life.
c) ammonia would have provided the electrons to generate atp using an electron transport chain within the mitochondria.
d) carbon dioxide would have provided the oxygen needed to perform photosynthesis, resulting in the production of glucose.

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

In a hypothetical breed of dogs, coat color is controlled by two genes. there are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. consider the following crosses. cross 1: black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. f1 males and females are all black. when f1 are intercrossed, f2 males and females are black or brown. cross 2: black females from a lineage of all black dogs are crossed with tan males from a lineage where all males are tan and all females are cream. f1 males are black, f1 females are gray. when f1 are intercrossed, f2 males and females are black, brown, gray, or tan. cross 3: silver females from a lineage where all females are silver and all males are gray are crossed with brown males from a lineage of all brown dogs. f1 males and females are all gray. when f1 are intercrossed, f2 males are black, brown, gray, or tan, f2 females are cream, gray, silver, or tan. select the correct statements regarding the mode of inheritance of the coat color genes. a) both genes are x-linked. b) both genes are autosomal. c) one of the genes modifies the expression of the other gene. d) each gene has an additive effect on the intensity of coat color. e) each gene independently specifies three colors. f) one of the genes is autosomal, and the other is x-linked.

What does the positioning of transcription factors determine?