bio
Okazaki fragments are formed by dna polymerase adding nucleotides to the
lagging strand
a diploid individual has a maximum of
2 alleles
if an animal population is diploid each individual possesses
2 alleles
in a human cell at prophase 1 there are ______ tetrads
4
sticky ends are
DNA fragments with single-stranded ends
to control the cell cycle
Kinases and cyclins are internal factors that
during translocation the movement of the ribosome repositions the trna linked to the growing polypeptide chain to the ___ site thereby vacating the ___ site for the arrival of a new amine-aycl trna
P;A
operon
a group of structural genes with related functions plus the closely linked DNA sequences responsible for controlling them
initiation of transcription requires
a promoter sequence
amino and carboxyl functional groups tend to form based and acids by gaining or losing
a proton
Why is it advantageous for cells to be small
a small cell has a small volume relative to surface area, thereby increasing efficient transport
the 3' end of eukaryotic pre-mrnas are changed by
adding 100-250 adenine nucleotides
Evolution is a change in
allele frequencies in a population over time
which of the following is not the correct bond for the macromolecule
carbohydrate/peptide
which of the following isn't a correct monomer/polymer paring
cellulose/triglyceride
The wobble hypothesis states that:
certain trna anticodons can pair with more than one codon sequence
A TATA box is seen in __________ cells and is the site where __________.
eukaryotic; RNA polymerase binds
considering that virtually all cells in any given individual
gene expression is regulated such that different cell types produce different protiens
which of the following must be true for a female to have hemophilia
her mother is a carrier and her father has the disease
an ultimate cause of behavior is
how and why behavior came to be
which of the following is responsible for the alpha helical structure of proteins
hydrogen bonds
as water boils and turns to steam what happens to the hydrogen bonds
hydrogen bonds break completely and allows water molecules to escape
the cell cycle of a typical somatic cell consists of
interphase and M phase
noncoding sequences located within coding regions of dna are called
introns
you isolate a cellular structure and determine that it is composed of a-tubulin and b-tubulin. what is the structure
microtubule
____ promote cancer development while ____ prevent cancer development
oncogenes; tumor suppressor genes
which statement about plasma membranes is false
plasma membranes prevent communication with other cells
the function of upstream promoter elements in eukaryotes, such as enhancers and silencers, is to
regulate the efficiency of transcription initiation
the difference between an acid and a base is that an acid ____ whereas a base ____
releases H+ ions in solution; accepts H+ ions
another word for testes
scrotum
Spermatogenesis takes place in which of the following structures
seminiferous tubules within the testes
the genetic code is sometimes called universal meaning that all organisms
share the same coding mechanism
molecules containing a large number of hydroxyl groups are
soluble in water
which of the following statements about fatty acids is true
they are composed of hydrocarbon tails and a carboxyl group
what is the purpose of a buffer
to minimize change in pH
a ___ is required to transfer genes from one organisms to another
vector
cDNA libraries contain
exon portions of expressed genes
the genetic code is sometimes called
universal