Exam 2: Nucleus

During a routine examination of a 3-year-old child, the pediatrician notes that the color of the pupil is white and that the child is cross-eyed. She asks the child's father if there are any cases of retinoblastoma in the family, and when the answer is in the affirmative she calls in a pediatric ophthalmologist. The ophthalmologist knows that retinoblastoma is due to the mutation of the Rb gene (retinoblastoma gene) and that it is a recessive trait. Retinoblastoma can metastasize to the brain via the

A patient with cancer possesses cells that are undergoing mitosis at a very rapid rate. The contractile rings that are formed during cytokinesis are composed of

During meiosis some chromosomes do not separate from each other. This is called

A patient with a chromosomal complement of XXX has

Which RNA synthesis is catalyzed by RNA polymerase II?

A 2-month old infant is brought to the physician's office to be examined, and the physician notices that he has flaccid muscles, a smaller head than usual, a large tongue, and a short nose and broad face. The parents say that the baby is very quiet and hardly ever cries. The pediatrician suspects aneuploidy. The baby probably has which of the following chromosomal configurations?

In Fig. Img_009, the cell at the tip of the pointer is in which of the following phases of mitosis?

Chiasmata formation

In the Fig. Nucleus, the cell depicted in this electron micrograph synthesize

The binding of cyclin B to CDK1 (cyclin-dependent kinase 1) permits the cell to progress from

A patient with a chromosomal complement of XXY has

In Fig. Img_010, the cell at the tip of the pointer is in which of the following phases of mitosis?

A patient with a chromosomal complement of XO has

During a routine examination of a 3-year-old child, the pediatrician notes that the color of the pupil is white and that the child is cross-eyed. She asks the child's father if there are any cases of retinoblastoma in the family, and when the answer is in the affirmative she calls in a pediatric ophthalmologist. The ophthalmologist knows that retinoblastoma is due to the mutation of the Rb gene (retinoblastoma gene) and that it is a recessive trait. Not all cases of retinoblastoma have a familial component. In the sporadic form of retinoblastoma, the child's normal genetic complement does not predispose the child to have retinoblastoma. If this child had the sporadic form of retinoblastoma, then