Indicate the order of cell types involved in the response to the first exposure to an allergen.
A. B cell, helper T cell, antigen-presenting cell, plasma cell
B. Antigen-presenting cell, helper T cell, B cell, plasma cell
C. plasma cell, antigen-presenting cell, helper T cell, B cell
D. antigen-presenting cell, B cell, plasma cell, helper T cell
Answer: B. Antigen-presenting cell, helper T cell, B cell, plasma cell
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Carbon has 4 valence electrons and oxygen has 6 . Carbon dioxide would contain _____
A. four hydrogen bonds B. two single covalent bonds C. two double covalent bonds D. one single covalent bond
Which of the following statements is not true of resin?
A. Resins are produced by many species of conifers. B. Resins deter insects and fungi. C. Some pine resins can be boiled down to produce a sweet syrup. D. Many resins are distilled to produce turpentine and other solvents. E. Some conifer resins are used to produce chemotherapy agents.
A small population of Dutch settled in South
Africa in the 17th century and became known as Afrikaners. By chance, a few Dutch settlers carried the gene for Huntington’s disease. Today Huntington’s disease occurs at a relatively high frequency in this population. This is an example of
a. the bottleneck effect. b. the founder effect. c. gene flow. d. the Red Queen effect. e. natural selection.
A locus is best defined as _____
A. an alternate form of a gene B. the chromosome location of the centromere C. the location of a gene on a chromosome D. a mutation of a gene to an alternate state E. the site of crossing over