sap is translocated from areas of supply, called sources, to areas of metabolism or storage, called sinks. Which of the following statements about source and sink are TRUE?

a.) Sinks include any nonphotosynthetic organs of the plant and organs that do not produce enough photosynthetic products to support their own growth or storage needs

b.) Sources include exporting organs that are capable of producing photosynthate in excess of their own needs

c.) During the growing season of the first year, storage root is a sink, when it accumulates sugars received from the source leaves. During the second growing season the same root becomes a source

d.) Roots, tubers, developing fruits, and immature leaves, which must import carbohydrate for normal development, are all examples of sources tissues

Find the correct combination of the source and sink pattern of translocation.

#Question id: 3812

#Unit 3. Fundamental Processes

The mechanism of DNA replication is studied in an E. coli replication fork. Which is a characteristic of this replication fork?

#Question id: 3813

#Unit 3. Fundamental Processes

The mechanism of DNA replication is studied in an E. coli replication fork. Which is a property of Okazaki pieces in an E. coli replication fork?

#Question id: 3814

#Unit 3. Fundamental Processes

The mechanism of DNA replication is studied in an E. coli replication fork.

Which is a property of RNA primers in an E. coli replication fork?

#Question id: 3815

#Unit 3. Fundamental Processes

Use the figure to answer the following question. A space probe returns with a culture of a microorganism found on a distant planet. Analysis shows that it is a carbon-based life-form that has DNA. You grow the cells in 15N medium for several generations and then transfer them to 14N medium. Which pattern in the figure would you expect if the DNA was replicated in a conservative manner?

#Question id: 3816

#Unit 3. Fundamental Processes

The mechanism of DNA replication is studied in an E. coli replication fork. Which is a characteristic of an E. coli replication fork and a eukaryotic replication fork?

#Question id: 3817

#Unit 3. Fundamental Processes

DNA replication is studied in a newly discovered bacterium. It takes 30 min for the bacterium to complete a round of replication at 37oC. A Meselson-Stahl-type experiment was performed. The bacteria were grown for several generations in 14N-medium and then switched to 15N-medium. The DNA molecules were then analyzed.

If the mechanism of DNA replication in this bacterium were dispersive, what results would be found when the double-stranded DNA was analyzed in a CsCl gradient after two generations in 15N-medium?