The plasma membrane is a thin sheet of lipid embedded with
A. sodium and potassium ions.
B. carbohydrates.
C. nucleotides.
D. polymers.
E. proteins.
Answer: E
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A phylogenetic tree is shown in part (b) of the image above. Phylogenetic trees visually represent hypotheses of the evolutionary relationships and ancestry of species or species groups. In this case, Najash is placed in proposed context with other snake species, representing different groups of snakes around the world. What can you conclude about the evolution of sea snakes and the Najash species?
A. The phylogenetic tree shows that Najash, lower in the diagram, had the fossil marine snakes in its ancestry. B. Najash diverged separately and earlier than the three fossil marine snakes, indicating only a weak evolutionary relationship. C. All of these answer options are correct, except that Najash did not have fossil marine snakes in its ancestry. D. Najash is proposed as a separate group from other snakes, while the three fossil marine snakes are more similar to living snakes. E. Both Najash and the three fossil marine snakes have ancestry traced back to an original snake species.
A clear distinction between therapeutic cloning and reproductive cloning is that
A. reproductive cloning involves the eventual destruction of the embryo, whereas therapeutic does not. B. therapeutic cloning involves the immediate destruction of the embryo, whereas reproductive cloning postpones the destruction until later. C. reproductive cloning involves the use of other species' cells for humans, whereas therapeutic cloning does not. D. therapeutic cloning involves the eventual destruction of the embryo, whereas reproductive cloning does not.
Mitochondria are associated with the production of _____.
ATP Nucleic acids Lipids Protein
Bacteria in the stationary phase have a few phenotypes that are less sensitive to antibiotic targeting the cell wall. which phenotype is the most resistant to antibiotics.
a. persisiter cells b. endospores c. viable but non-culturable d. physical disinfectant