Concept Flashcards
What is the most logical sequence of steps for splicing foreign DNA into a plasmid and inserting the plasmid into a bacterium?
Extract plasmid DNA from bacterial cells. Cut the plasmid DNA using restriction enzymes. Hydrogen-bond the plasmid DNA to nonplasmid DNA fragments. Use ligase to seal plasmid DNA to nonplasmid DNA. Transform bacteria with a recombinant DNA molecule.
The reason Sodium cannot cross the membrane easily is because
It is charged
The production of 1 molecule of glucose would require
Input of 18 ATP
Describes the termination of transcription in prokaryotes
RNA polymerase transcribes through the terminator sequence, causing the polymerase to separate from the DNA and release the transcript.
In eukaryotic cells, transcription cannot begin until
several transcription factors have bound to the promoter
How many different amino acids could be specified if codons were two nucleotides in length?
16(4的平方)
The nitrogenous base adenine is found in all members of which group?
ATP, RNA, DNA
Cells that do not divide are usually arrested in
G1
During mitosis, where do the microtubules of the spindle originate
Cetrosome
Why do chromosomes coil during mitosis
To allow the chromosomes to move without becoming entangled and breaking
What is a cleavage furrow?
A groove in the plasma membrane between daughter nuclei
Why do neurons and some other specialized cells divide in frequently
They have been shunted into G0
The best conclusion concerning Delta is that the cell
Are actually in the G0 phase
