Compare the teeth of Australopithecus afarensis and Homo sapiens.
a. Describe similarities and differences between the two species
b. Write a hypothesis about dietary differences between the two species based on their teeth.
a. Describe similarities and differences between the two species. A. Afarensis has large and specialized teeth while modern humans have teeth that are smaller and less specialized.
b. Write a hypothesis about dietary differences between the two species based on their teeth. The large specialized teeth of A. Afarensis were adapted for grinding hard foods and the large canines for tearing. The smaller teeth of modern humans are adapted for a huge diversity of generally softer foods.
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In a water molecule, because oxygen is more electronegative than hydrogen, the shared electrons are
more commonly found around the __________ nucleus than the __________ nucleus. a. oxygen; hydrogen b. hydrogen; oxygen c. hydrogen; other hydrogen d. oxygen; nitrogen e. nitrogen; oxygen
The best explanation for why a mouse develops into a mouse and not a human is
A. the genes are mostly the same but have been rearranged. B. synteny has not been conserved. C. most of the non-coding genes are different. D. most of the coding genes are different. E. gene expression differs.
L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. C. Enzymes can only recognize a single, specific stereoisomer. D. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form.
The internal cytoskeletal structure of cilia and flagella grows out from a structure called a basal body located near the cell surface. Based on this information, where would you predict the plus end of the microtubules to be located?
a) It is not possible to predict from the information provided. b) near the basal body c) near the tip of the cilia or flagella d) at both ends of the cilia or flagella