bio 101
what are restriction enzymes used for in molecular biology
cutting DNA at specific places
hydrogen bonds can form between guanine and .....and between adenine and ....
cytosine and thymine
the dna code is degenerate and that means that
different codons code for the same amino acids
The two strands of DNA are in antiparallel orientation. this causes what in replication
dna polymerase runs in opposite directions on the two strands
spinal cord
ectoderm
sequences on the DNA where transcription factors can bind and regulate a promoter are called
enhancers
arthropods are characterized by
exoskeleton, open circulatory system, and ventral nerve cord
in human development, the mothers blood mixes with that of the embryo in the placenta
false
which of these groups does not molt
mollusks
In a single PCR cycle consisting of 15 seconds at 94c, 30 seconds at 50c,and 1 min at 72c, what is happening in the step run at 50c
primers are anealing to the dna to be amplified
an animal with ventral nerve cord and dorsal heart is most likely
protostome
an important way of discovering close relationships between groups of organisms depends on ..
shared characteristics
which of the following are a possible way for cells to become different fro each other in development
splitting up cytoplasmic determinants differently during cleavage
two functions of fertilization are combining the parental genomes and.....
starting the developmental process
who is implicated in the crime by this evidence
suspect 1
to translate mRNA into protein.... are needed
tRNA and amino acids
a possible effect in development of having different cytoplasmic determinants in different cells
that cells may transmit different signals to other cells
the portion of the molecule in the figure above labeled 5 is
the attached amino acid
which of the following statements would most likely be accurate given that information
the genetic code evolved before the different domains diverged
gastrulation can be defined as follows
formation of basic cell layers in an embryo
in humans the DNA of each nucleus, if stretched out, would be 6 feet long , it fits in the nucleus because
it is coiled up around proteins
which of the following molecules must move across the nuclear membrane after being synthesized from a DNA sequence and is then translated by a ribosome
mRNA
bones
mesoderm
mRNA enters which organelle to be translated
ribosome
The protist group thought to be most closely related to animals are the
choanoflagellates
the portion of the molecule in the figure above that contains the anti-codon is
3
which component of the T2 virus actually ended up inside the cell
DNA
which of the following adds new nucleotides to a growing DNA chain
DNA polymerase
a plasmid is
a circular DNA molecule
different proteins can be made from the same gene by
alternative splicing of eons in mRNA
the blastopore is
an opening in the embryo that cells move through in gastrulation
examples of animals with segmented bodies are
annelids and athropods
you find a wormlike animal while scuba diving and want to determine whether it is a shell less mollusk, a polychaete annelid, or a flatworm. which of the following would allow you to definitively classify the organism into one of those categories
bristle like structures on tiny appendages
what happens during gastrulation
the three embryonic tissue germ layers form
the function of transcription factors is
to regulate which genes get transcribed in a cell
which of the following is true of translation
translation starts at a start condon
how was it determined that the defect in these cells was due to a lack of DNA repair
unlike normal cells, xp cells did not incorporate new DNA when exposed to UV
a first step in transcription is
unwinding of DNA from chromatin
