The slowly decaying organic litter from plant and animal tissues that is found in the soil is called ________.
A. the lithosphere
B. aggregate
C. a biofilm
D. detritus
Answer: D
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Which of the following most accurately describes spore production in ascomycetes?
A. Within each ascus, the zygote undergoes meiosis followed by mitosis to produce eight spores. B. Within each ascus, the zygote undergoes mitosis followed by meiosis to produce eight spores. C. Within each ascus, the zygote undergoes two rounds of mitosis to produce eight spores. D. Within each ascus, the zygote undergoes mitosis to produce four spores. E. Within each ascus, the zygote undergoes meiosis to produce four spores.
Male gonads are __________, which produce sperm
and the sex hormone __________. Fill in the blank(s) with the appropriate word(s).
Certain species of lilies, if eaten by pregnant ewes, can cause the ewes to produce lambs with severe birth defects because the plants' cyclopamine can block embryonic response to Shh
This type of birth defect is a phenocopy of mutations in which genes?
EACH of the following features makes phage M13 an ideal genetic engineering tool for cloning and DNA sequencing EXCEPT
a. rapid lysis of host cells, yielding high virion bursts and multiple copies of cloned DNA. b. small genome size, which facilitates sequencing efforts. c. dsDNA, which is produced in its replicative form.. d. release from host cells without lysis, causing infected cells to act as a continuous source of cloned DNA as long as the culture is maintained.