bio Chapter 4 section 2
Which of the following is true about the enzyme telomerase?
It can re-establish telomere length.
Which of the following is typical of cancer cells?
Malignant cells migrate.
Which of the following initiates the process of transcription?
RNA Polymerse
The most common core promoter is the
TATA box
Cytokinesis in plant cells is distinguished from that in animal cells by the presence (in the plant cell) of
a cell plate
The post-transcription modification of mRNA include the addition of
a poly-A tail to the end of the mRNa.
Which of the following is true of interphase?
all of the above are true
The centromeres split and chromosomes move toward opposite ends of the cell during which phase of mitosis?
anaphase
The sister chromatids of a chromosome are separated during which phase of mitosis?
anaphase
In the lactose operon, the repressor protein functions by
attaching to the operator and preventing the polymerase from transcribing operon DNA
A mammalian female's
body is a mosaic for the X-linked traits she inherits.
On its own, the product of the C group gene alone in Arabidopsis thaliana triggers
carpel development
A homologous pair is composed of two
chromosomes
The core promoter is usually located
close to the start site of gene
In eukaryotes, regulatory proteins bind to the
core promoter
The division of cytoplasm is accomplished during
cytokonysis
Introns are regions of the gene that
do not code for poly
Enhancer regions are
either upstream (before) or downstream (after) the gene
The portion of the DNA molecule that is translated is composed of
exons
Which of the following are most likely to result in a nonfunctional protein product?
frameshift mutations
If two chromosomes were found to have the same appearance and carry genes for the same traits but originated from different parents, these chromosomes would be called
homelogous chromosomes
During the process of protein synthesis, translation occurs
in the cytoplasm
X chromosome inactivation results in the
inactivation of either the paternal X chromosome or the maternal X chromosome.
Which statement is false concerning X chromosome inactivation?
it is an accident of evolution
The period during which the chromosomes are lined up in the middle of the cell is
metaphase
The chromosomes are aligned midway between spindle poles during
metsphase
Which process is absolutely necessary for asexual cellular reproduction to occur in eukaryotes?
mitosis
In an operon, the site of RNA polymerase initial attachment is called the
promoter
RNA polymerase begins transcription by binding to the _____ region of the gene.
promoter
The molecules which deliver amino acids to the site of protein synthesis are
ribosomes
which of the following is associated with mitosis?
somatic cells
The anticodon is part of a(n)
tRNA molecule
A new nuclear membrane is formed during
telophase
The creation of a membrane or cell wall separating the nuclei produced by mitosis occurs at the end of
telophase
The transcription start site is the location where
transcription begins
Ribosomes, mRNA and tRNA are brought together during the process of
translation