Winogradsky columns ________.
A. are used in the process of isolating nanobacteria
B. are typically used to isolate aquatic protozoa
C. are used in the process of isolating aquatic viruses (virioplankton)
D. are used as a model system for studying microbial interactions
Answer: D
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You find an Arabidopsis plant in your greenhouse that lacks stamens and carpels, and has two rows of petals and sepals. What happened to cause this abnormal flower development?
A. a deleterious mutation of gene C B. an overexpression of gene B C. a deleterious mutation of gene A D. a deleterious mutation of C and overexpression of E E. a deleterious mutation of C and overexpression of A
At which level is biodiversity declining world-wide?
1.genetic diversity within species 2.species diversity 3.ecosystem diversity 4.biodiversity is declining at all levels
Which of the following statements is true?
a. Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits. b. Homologous chromosomes differ in banding patterns, the traits they code for and size. c. While sex chromosomes determine different genders they look the same until they are stained. d. In humans all 46 chromosomes have an identical match called the homologue.
Bacterial plasmids and artificial chromosomes are used as ________ to insert foreign DNA into host cells and create recombinant genomes.
A. subunits B. endonucleases C. vectors D. clones