Author: Anonymous

In the cells of all human females, one X chromosome is inactivated. The opsin1 gene is on the X chromosome and it is transcribed in the retinal cells of the eye. Loss-of-function mutations in this gene cause the recessive trait of color blindness. Most women who have one mutant allele of the opsin1 gene and one normal allele of the opsin1 gene (heterozygotes) can still see color. What is the most likely explanation for this finding?

As shown at left in the diagram below, a plasmid vector has three Eco RI sites. The vector also has one Bam HI site located within the polylinker (Multiple Cloning Site). The numbers in kb (1 kb = 1000 bp) are the numbers of base pairs between two adjacent EcoRI sites. After digesting this vector to completion with either Eco RI or Bam HI in separate reactions, you electrophorese each reaction in separate lanes on an agarose gel. On the right is the result of gel electrophoresis produced by exposing the ethidium bromide–stained gel to UV light. What are the sizes of DNA fragments in the four bands from top to bottom?

Cystic fibrosis in humans is caused by mutations in a single gene and is inherited as an autosomal recessive trait. A couple where neither has cystic fibrosis has two children. The first child has cystic fibrosis, and the second child is unaffected. What is the probability that the second child is a carrier (heterozygous) for the mutation that causes the disease?

Epigenetic changes refer to changes in gene function that are stable due to changes in DNA sequence.

A man is a carrier for Wilson’s disease (Aa) and Rotor syndrome (Rr). Assume the genes involved in these two disorders are both on chromosome 13. Below are possible representations of his genotype (labeled #1, #2, and #3). Which of them could be correct?

Your patient is on 3L nasal cannula of oxygen. Their oxygen drops from 93% to 84% and does not go up with a seated rest break. What do you do?

General precautions for all patient equipment and lines include all of the following EXCEPT

You have a patient with COPD who is on 2L of oxygen via a nasal cannula. Their oxygen saturation is 86% after you ambulate with them. What is the first thing you should do?

A/an continuously measures blood pressure or is used to obtain arterial blood samples.

A/an provides medication or fluid directly into the circulation.