Why does a replication fork have a leading and lagging strand?
A. Both answer choices of DNA synthesis proceeding from 5' to 3', and DNA polymerase acting on the 3' end, are correct.
B. DNA synthesis always goes from 3' to 5'.
C. DNA synthesis always goes from 5' to 3'.
D. DNA synthesis can grow off of either the 3' or 5' end.
E. DNA polymerase only attaches nucleotides to the 3' end of strands.
A. Both answer choices of DNA synthesis proceeding from 5' to 3', and DNA polymerase acting on the 3' end, are correct.
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At 4:00 p.m. a closed flask of sterile broth is inoculated with 10,000 cells. The lag phase lasts 1 hour. At 9:00 p.m. the log phase culture has population of 65 million cells. The approximate number of generations that has occurred is
A. 27. B. 13. C. 21. D. 5.
When plasmids are used to produce a desired protein, the ________
A) plasmids multiply and produce the protein outside of the bacterium B) bacterial chromosome is genetically engineered, and the plasmid is used to help the bacterium replicate C) desired gene is inserted into the plasmid, and the plasmid is taken up by the bacterium D) bacterial genome and plasmid are inserted into the genome of the cell containing the desired gene
The site of photosynthesis in a cell is the:
A) mitochondrion. B) central vacuole. C) chloroplast. D) stomata.
Which part of an antibody molecule contains the variable regions of a heavy and light chain that fold into a groove that will interact directly with and bind to a specific antigen?
A) Light chains B) Fc end C) Fab ends D) Heavy chains E) Disulfide bonds