The walls of collenchyma cells contain large amounts of lignin, which is a polymer of ?-galacturonic
acid.
____________________ Indicate whether the statement is true or false.
F, pectin
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Which of the following is true of both T cells and B cells?
A. They produce effector cells against specific pathogens. B. They are produced from stem cells of the bone marrow. C. They can attack and destroy invading pathogens. D. They have a short life span. E. All of these statements are true.
A small amount of DNA is collected from a crime scene. However, the amount of DNA collected is insufficient to perform the necessary experiments to link a suspect to the crime. Which method could be utilized to increase the amount of DNA?
A. polymerase chain reaction (PCR). B. DNA sequencing. C. fluorescent labeling of DNA. D. microarray analysis. E. gel electrophoresis.
The least inclusive of the taxonomic categories
listed here is a. family. b. phylum. c. class. d. order. e. genus
Which is NOT necessary for sympatric speciation?
a. organisms living together in the same location b. a common home range c. geographic barriers d. existing interbreeding population e. reproductively mature individuals