During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a(n) ________.
A. trophozoite
B. cyst
C. sporozoa
D. endospore
E. seed
Answer: B
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In a _______ translocation, two non homologous chromosomes exchange parts and no genetic information is gained or lost from the cell in exchange.
Fill in the blank(s) with the appropriate word(s).
There is a spectrum of syndromes in humans known as Xeroderma pigmentosum
The individuals that have XD most commonly have mutations in their nucleotide excision DNA repair mechanisms that make them particularly susceptible to environmental mutagens such as UV light. Individuals have to be careful with how much sunlight they are exposed to since they have an extremely elevated chance for developing skin cancer.. There have been several cell lines that have been established from XD patients that can be studied in tissue culture. In an experiment several different cell lines of unknown origin were tested for their ability to undergo unscheduled DNA synthesis (UDS), an assay for DNA repair. In this assay the amount of radioactive nucleotides that are incorporated into DNA after the cell sustains a mutagenic event are measured. The amount of radioactivity incorporated is measured by the number of counts per minute (CPM). Below is a table from such an experiment. Which cell line is most likely from XD patient(s)? Cell line CPM in UDS assay CPM if no mutagenic event A 2,500 2,750 B 300,000 5,000 C 45,000 25,000 D 275,000 50,000 Wild-type control 750,000 75,000 A. A B. B C. C D. D
Shallow water benthic algae distribution is dependent upon ________ when close to shore
a. sunlight and turbidity b. water depth and turbidity c. sunlight and substrate d. water depth and oxygen levels
Which of the following terms is not applied to innate behavior?
a. inborn b. learned c. genetically programmed d. instinctive e. inherited