How would Earth be different without photosynthesis?
A. The amount of oxygen in the atmosphere would be lower.
B. Heterotrophs would have few food sources.
C. Autotrophs would reply on other chemical mechanisms to make carbohydrates.
D. More sunlight would be absorbed and converted to environmental heat.
E. All answers are correct.
E. All answers are correct.
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Heterozygotes for the sickle cell trait have an adaptive advantage in areas where malaria is prevalent. This is an
example of ____.
a. a fixed allele b. genetic drift c. a balanced polymorphism d. sexual selection e. disruptive selection
Which part of the cell theory is supported by what is shown in this illustration?
A) All organisms are composed of one or more cells. B) All cells arise from existing cells. C) Any cell in an organism can turn into a different type of cell. D) All cells have a similar structure.
A young scientist has discovered a new species of grub worm in the Amazon. He would like to explore the possibility that in this grub worm the codon CUC is the start codon and codes for methionine, not leucine as it does in other worms. To date, he has been unable to get his research funded, most likely because
A) worms have been extensively studied and their genomes are simple. B) worms do not contain homologous genes to humans. C) codons are generally the same in all worms. D) the genetic code is universal to all species. E) worms are difficult to maintain in the laboratory.
In the human skeleton, the ________ is a ball-and-socket joint
Fill in the blank(s) with correct word