Which of the following statements regarding vectors is FALSE?
A. Vectors are usually autonomously replicating DNA molecules.
B. A useful vector contains multiple restriction sites for insertion of DNA.
C. Vectors are generally over 100,000 base pairs in size.
D. Cloning vectors frequently contain sequences necessary for expression of inserted sequences.
E. Cloning vectors include a "marker" to facilitate identification of cells containing them.
Answer: C
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An ____ is a community of organisms and the physical environment it occupies
Fill in the blank with the appropriate word.
Answer the following statements true (T) or false (F)
1. The water cycle is primarily a chemical process, not a physical one. 2. Most evapotranspiration occurs from the sea. 3. Grasslands have a lower herbivore biomass than deserts. 4. All living organisms require phosphorus for ATP. 5. Phytoplankton consume zooplankton.
When the prey population is below the predator isocline, the predator population is
a. increasing b. decreasing c. neither increasing nor decreasing
Which action is most similar to the way in which water is moved through the xylem sap of a plant?
A) a person drinking through a straw B) a vaccine being ejected out of a syringe C) water gushing up from a fountain D) a dart being blown out the end of a blowgun