lecture quiz #3 Flashcards
which pre-mRNA processing step is important for initiating translation?
7-methylguanosine 5’ cap
at which stage of meiosis are sister chromatids separated from each other?
anaphase II
a diploid cell has_______ the number of chromosomes as a haploid cell.
twice
meselson and stahl’s experiments proved that DNA replicates by which mode?
semi-conservative
if the sequence of the 5’-3’ strand is GGATTAGCG, then the complementary sequence has the following sequence:
3’-CCTAATCGC-5’
which of the following is the correct order of events in mitosis?
the kinetochore becomes attached to the mitotic spindle. sister chromatids line up at the metaphase plate. cohesion proteins break down and the sister chromatids separate. the nucleus reforms and the cell divides.
what is a likely evolutionary advantage of sexual reproduction over asexual reproduction?
sexual reproduction results in variation in the offspring.
in which direction does DNA replication take place?
5’ –> 3’
the part of meiosis that is similar to mitosis is ________.
meiosis II
a scientist identifies a pre-mRNA with the following structure.
what is the predicted size of the corresponding mature mRNA in base pairs (bp), excluding the 5’ cap and 3’ poly-A tail?
805
if a somatic cell of a typical organism has 148 chromosomes, how many chromosomes will be in a gamete of that same organism?
74
separation of the sister chromatids is a characteristic of which stage of mitosis?
anaphase
the DNA double helix does not have which of the following?
ribose & uracil
the fusing of Golgi vesicles of dividing plant cells forms the cell plate and the contracting ring of the cleavage furrow of dividing animal cells happen during which phase?
telophase/cytokinesis
if the DNA of a particular species was analyzed and it was found that it contained 19 percent of Thymine, what would be the percentage of Guanine?
31
in any given species, there are at least how many types of aminoacyl tRNA synthetases (enzymes that attach the appropriate amino acids to the tRNA molecule)?
20
what is the main prerequisite for clearance at the G2 checkpoint?
accurate and complete DNA replication
the AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this?
degeneracy
how many nucleotides are in 8 mRNA codons?
24
meiosis usually produces ________ daughter cells
four haploid
