In human cells, DNA replication begins at the top of each chromosome and spreads down the length. Indicate whether the statement is true or false
F
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Which is not a hypothesis that attempts to explain the latitudinal diversity gradient?
A. Species in tropical habitats have had longer to evolve and diversify. B. Temperate communities have fewer species due to the need to adapt to a wider range of weather conditions. C. Tropical areas have larger population sizes for a given species. D. A given species in tropical habitats may be more spread out, leaving room in between for others. E. Tropical areas generally have more parasites that may attack particular types of trees, thereby affecting their distribution.
A characteristic of all modern, living cells is ____
a. a semi-permeable membrane keeping the internal environment of the cell separate from the external environment b. nucleic acids linked in a sequence to form multiple large macromolecule chains c. a requirement for the nucleic acids to be contained behind a nuclear membrane d. a mechanism of converting energy from the sun e. a method of converting protein changes into nucleic acids
Which plant's seeds are "naked", or not within a fruit?
a. angiosperms b. gymnosperms c. bryophytes d. endosperms e. lycophytes
Why would a scientist trying to isolate osteoblasts look between the periosteum and the bone in a young animal to find them?
What will be an ideal response?