Chapter 11 Bio Quiz

A mistake during DNA replication prevents the trp repressor from binding to the operon operator. When these cells are placed in a solution containing chicken broth, what happens?Tryptophan would bind to the repressor.
What controls the way in which a zygote differentiates?Selective genes are turned on and off, depending on the fate of the cell.
In female mammals, the inactive X chromosome in each cellbecomes a Barr body.
The coding regions of a gene (the portions that are expressed as polypeptide sequences) are calledexons
Alternative RNA splicing has revealed inaccuracies in the one gene – one polypeptide hypothesis. Why?Transcription of the same gene can lead to the production of different mRNAs.
After translation is complete, the insulin polypeptide is activated by _____the cutting of the initial translation product to yield two shorter chains joined together by sulfur linkages
Which of the following statements about fruit fly development is false?The location of the head and tail ends of the egg is primarily determined by the location of sperm entry during fertilization.
A researcher performs a DNA microarray but forgets to add the enzyme reverse transcriptase. This is important because the enzyme makes _____ from a(n) _____ template.cDNA … mRNA
To initiate a signal transduction pathway, a signal binds to a receptor protein usually located in theplasma membrane.
Researchers have used yeast mating systems as model systems to studysignal transduction systems
Half the trees in an orchard were derived from rootstock “A” and half from rootstock “B,” but all the trees had the same scion. If the trees grafted onto rootstock “A” were infected by a parasite that causes blossom rot, the trees grafted onto rootstock Bwould be very likely to become infected, because the remaining scions are genetically identical to those that are already infected.
Using nuclear transplantation, it is possible to generate _____ for therapeutic uses.blastocysts
Since the first animal was produced using a fully differentiated cell, a number of observations have been made. Which of the following statements is true in regard to reproductive cloning?Cloned animals develop chronic conditions that are usually only associated with old age.
Stem cells could be immensely important in the treatment of which of the following conditions?spinal cord injuries
Which of the following statements regarding stem cells is false?Adult, but not embryonic, stem cells can be grown in laboratory culture.
Proto-oncogenes have the potential to become oncogenes. Which of the following is most likely to lead to cancer?a mutation that causes the proto-oncogene to become overactive
A gene that can cause cancer when present in a single copy in a cell is called a(n)oncogene.
Colonoscopy is the examination of the large colon. It allows for visual diagnosis of ulcers and polyps, which may lead to colon cancer. A polyp _____.is a cluster of abnormal cells
The development of colon cancer occurs slowly, and colon cancer is more frequently seen in the elderly than the young. This is most likely becausefour or more somatic mutations must occur to give rise to the cancer, which takes time.
The carcinogen known to cause the most cases and types of cancer istobacco
In a prokaryote, a group of genes with related functions, along with their associated control sequences, definesan operon
Anhidrotic ectodermal dysplasia is an X-linked disorder that results in the absence of sweat glands. How would this condition be manifested in a heterozygous female?She would have a random pattern of tissue with and without sweat glands.
In eukaryotic cells, several proteins are involved in the process of transcription. This process involves enhancers that are _____.bound by activators, causing DNA to bend
When are DNA molecules the least tightly coiled?S phase of interphase
MicroRNA (miRNA) controls _____.translation
After translation is complete, the insulin polypeptide is activated by _____.the cutting of the initial translation product to yield two shorter chains joined together by sulfur linkages
In embryonic mice, a homeotic gene controls development of the neck, which includes the larynx and thymus. If this gene were deleted, a full-term mouse would show _____.lack of development of the larynx and thymus
Yeast are able to communicate with each otherthrough chemical signaling
Since the first animal was produced using a fully differentiated cell, a number of observations have been made. Which of the following statements is true in regard to reproductive cloning?Cloned animals develop chronic conditions that are usually only associated with old age.
The Rb protein prevents mitosis by inhibiting cells from entering S phase. Human papillomavirus (HPV) is thought to inhibit the action of the Rb protein in cervical epithelial cells. What would be the effect of cervical cells being infected with HPV?the mitotic rate would increase
A gene that can cause cancer when present in a single copy in a cell is called a(n)oncogene
Mutations in the proto-oncogene ras and the tumor suppressor gene p53disrupt normal regulation of the cell cycle.
n humans, the most common cancer is _____.lung cancer