What form of photosynthesis evolved first on Earth?
A) oxygenic
B) anoxygenic
C) autotrophic
D) heterotrophic
Answer: B
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Recombinant forms of what protease are used in laundry detergents to remove stains?
A) Casein B) Subtilisin C) Erythropoietin D) Insulin E) Streptokinase
Codons are three-base sequences that specify the addition of a single amino acid. How do eukaryotic codons and prokaryotic codons compare?
A) Prokaryotic codons usually contain different bases than those of eukaryotes. B) Prokaryotic codons usually specify different amino acids than those of eukaryotes. C) The translation of codons is mediated by tRNAs in eukaryotes, but translation requires no intermediate molecules such as tRNAs in prokaryotes. D) Codons are a nearly universal language among all organisms.
Which digestive structure stores concentrated bile?
a. the gallbladder b. the stomach c. the pancreas d. the duodenum
In the out-of-Africa hypothesis, there was interbreeding between the ancestors of modern humans on three continents.
Answer the following statement true (T) or false (F)