The organism Caenorhabditis elegans, a member of the phylum ____, is an important model organism
for studies of the genetic control of development.
a. Arthropoda
b. Onychophora
c. Nemertea
d. Annelida
e. Nematoda
E
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The ________ account for 10?15% of microtubules.
Fill in the blank(s) with the appropriate word(s).
Which of the following is the second step in gene mapping?
A. Target DNA removed from cells and isolated B. Cloning host treated with calcium chloride and receives plasmid C. Separate DNA fragments with gel electrophoresis D. Desired protein is produced by cloning host E. Gene is amplified by multiplication of cloning host
After meiosis, resulting daughter cells are
likely to contain
a. the same number of chromosomes as the parent cell. b. half the number of chromosomes than the parent cell carries. c. twice the number of chromosomes than the parent cell carries. d. three times the number of chromosomes than the parent cell carries. e. four times the number of chromosomes than the parent cell carries
The four phyla of the gymnosperms are
A. conifers, monocotyledons, dicotyledons, and cycads. B. monocotyledons, dicotyledons, conifers, and cycads. C. conifers, cycads, ginkgos, and gnetophytes. D. horsetails, true ferns, whisk ferns, and club mosses. E. mosses, liverworts, club mosses, and hornworts.