Why are both blood and bone considered connective tissue?
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Connective tissue consists of cells that form networks or layers in and around body structures.
Connective tissue also contains an extracellular matrix secreted by cells in tissue. The extracellular
matrix, which is non-living, separates the cellular portions of connective tissue. Bone is a dense
connective tissue of two types of cells embedded in an extracellular matrix containing collagen and a
type of calcium-phosphate mineral. In blood, the cellular components are red and white blood cells.
The extracellular matrix is plasma, which is a fluid.
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The African clawed frog (Xenopus laevis) is allotetraploid, likely as a result of an interspecies mating long ago, followed by a duplication of the entire genome. Xenopus laevis is fertile and has a normal life cycle
In contrast, mules, the allodiploid offspring of a male donkey and a female horse, are generally sterile. Why can Xenopus reproduce and mules cannot? A. Frogs are less sensitive to multiple copies of the genome than mammals. B. In allotetraploid organisms each chromosome has a chromosome to pair up with in meiosis, whereas in allodiploid organisms they do not C. The two frogs that interbred to form the Xenopus laevis must have been more closely genetically related than the donkey and horse are. D. The mule must have a genetic mutation that prevents it from reproducing.
The principal driving force for guttation is ____
a. passive transport b. sunlight c. root pressure d. upward pressure as sugar is forced into the roots e. pumping by the xylem cells
Why were bacteriophages used as the study "organism" of choice to confirm the role of DNA in heredity? Text Section LO1 Key Concept: bacteriophage, DNA experiment Level: Application of concepts
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Which of the following is essential in PCR?
A. DNA polymerase B. antisense RNAs C. reverse transcriptase D. DNA primers E. both DNA primers and DNA polymerase