Question

question 21
a 13-year-old girl has a karyotype that reveals an absent homologous x chromosome with only a single x chromosome present. what medical diagnosis will the nurse observe on the chart?

• down syndrome
• cri du chat syndrome
• turner syndrome
• fragile x syndrome

question 22
when discussing dna replication, which enzyme is most important?

• rna polymerase
• transfer rna
• messenger rna
• dna polymerase

question 23
a 30-year-old female presents with a gunshot wound to the head. the wound has seared edges and a deep penetration of smoke and gunpowder fragments. this wound would be documented as a(n):

• exit
• intermediate range entrance
• contact range entrance
• indeterminate range entrance

Explanation:

Question 21

Turner syndrome is characterized by a single X chromosome (monosomy X, karyotype 45,X). Down syndrome is trisomy 21, Cri du chat is due to chromosome 5 deletion, and Fragile X involves a mutation on the X chromosome. So the correct diagnosis is Turner syndrome.

DNA polymerase is the key enzyme for DNA replication, as it synthesizes new DNA strands. RNA polymerase is for transcription, tRNA and mRNA are involved in translation, not replication.

Contact range entrance wounds have seared edges and gunpowder/smoke fragments due to the gun being in contact with the skin. Exit wounds lack these, intermediate range has stippling, and indeterminate can't be classified. So this is a contact range entrance.

Answer:

C. Turner syndrome

Question 22