Describe the establishment and maintenance of the lysogenic state in the lambda phage
What will be an ideal response?
Answer: Lambda phage, once circularized by matching its cohesive ends, integrates into an E. coli host genome by targeting the attλ gene in the host genome. The att gene in lambda's genome then base pairs with the complementary sequences found in the attλ gene, and the lambda genome is inserted in the presence of an viral integrase catalyst. After the lambda genome is established in the host's genome, it is maintained along with the E. coli genome through replication. Lysis is triggered by DNA damage or other cellular stress and involves a viral excision enzyme.
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In lakes and ponds, shallow water near the shore comprises the:
1.Limnetic zone
2.Littoral zone
3.Photic zone
4.Profundal zone
Microphylls are found only in __________
a. hornworts b. liverworts c. club mosses d. ferns e. whisk ferns
Which of the following organs is not considered part of the digestive system?
a. tongue b. spleen c. gallbladder d. pancreas e. salivary gland
As the endosperm matures it swells and eventually becomes the fruit.
Answer the following statement true (T) or false (F)