Questions 11 - 20 Flashcards
During mitosis the genetic material is duplicated during
the S phase
The production of multiple gene-sized pieces of DNA defines __________.
gene cloning
Which of the following statements regarding DNA packing is false?
DNA packing tends to promote gene expression.
**DNA must be in its relaxed, unpackaged state in order for the RNA nucleotides to pair with DNA for transcription, and for replication.
Which of the following helps maintain the structure of chromosomes and control the activity of genes?
Proteins
Recombinant DNAWhen DNA from two sources is combined into one single piece of DNA, it is known as
Recombinant DNA
Both mitosis and meiosis are preceded by __________.
Interphase
**this is when the chromosomes are replicated prior to division, and the cell increases in size.
Strictly speaking, the phrase “like begets like” refers to
Asexual reproduction only
The features of “sticky ends” that makes them especially useful in DNA recombination is their ability to?
form hydrogen-bonded base pairs with complementary single-stranded stretches of DNA
**When the vector and the insert are both prepared with the same restriction enzymes the overhangs will match base pairs in the ligation reaction. This process is very accurate and restores the cut site so the insert can be removed at a later time if necessary.
The lac operon in E.coli…
prevents lactose-utilizing enzymes from being expressed when lactose is absent from the environment.
At the start of mitosis anaphase…
the centromeres of each chromosomes come apart
**At early anaphase we can observe that the centromeres disintegrates causing the dissociation of sister chromatids (option C). This would result in the separation of the sister chromatids (option B). After some time, the daughter chromosomes move toward the opposite poles (option E),
