Answer the following questions true (T) or false (F)
1. Flow cytometry makes use of fluorescence to count microbes.
2. All eukaryotes are diploid.
3. A chemical is reported to inhibit bacterial replication. Bacterial cells are placed in medium with all nutrients necessary for replication. The chemical is added to the culture, and after a half hour an extract of the DNA is prepared. A significant percentage of the DNA is in pieces about 1000 to 2000 bases in length. The results are consistent with the chemical blocking the function of DNA ligase.
1. TRUE
2. FALSE
3. TRUE
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Tight junctions contain ____.
A. occludins and claudins B. occludins and connexins C. cadherins and integrins D. claudins and integrins E. cadherins and claudins
Tapeworms are similar to fungi in that they
A) have cell walls made of chitin. B) are sessile autotrophs. C) feed by absorption. D) inhabit marine, damp terrestrial, and freshwater habitats.
Which vaccine-preventable disease caused by an RNA virus has been nearly eradicated?
A) measles B) influenza C) hantavirus D) polio E) rotavirus
Snail shell coiling is determined by a MATERNAL EFFECT gene. Snail shells can have either a right-handed (dextral) coiling or a left-handed (sinistral) coiling. Dextral (D) is completely dominant to sinistral (d). Answer the following questions based
upon this information. A sinistral female snail named Eustacia has offspring that are all dextral. What is the Eustacia's GENOTYPE? A) Dd or dd B) DD or Dd C) DD D) Dd E) dd