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TLS Online TPP Program

#Question id: 23589

Which of the following is an advantage of phage vectors over plasmid vectors?

#Unit 13. Methods in Biology
  1. Recombinant DNA must be packaged into phage particles in vitro
  2. It is not possible to isolate a line of cells that can propagate the recombinant DNA molecule.
  3. Transfection is more efficient than transformation for larger pieces of DNA.
  4. All of the above
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TLS Online TPP Program

#Question id: 10931

#Unit 7. System Physiology – Animal

A 24-year-old African-American man comes to the emergency room 3 hr after the onset of severe back and chest pain. These problems started while he was skiing. He lives in Los Angeles and had a previous episode of these symptoms 5 years ago while visiting Wyoming. He is in obvious pain. Laboratory studies show the following:

Hemoglobin                                        11 gm/dl

Leukocyte count                                 22,000/μl3

Reticulocyte count                              25%

What is the diagnosis of this patient?
TLS Online TPP Program

#Question id: 30064

#Unit 7. System Physiology – Animal

Which of the following neurotransmitter released at the vagal nerve endings?
TLS Online TPP Program

#Question id: 16140

#Unit 13. Methods in Biology

Many mouse genes are “tissue-specific,” that is, they are present throughout the body but are expressed in only one of the animal’s many tissue types. (Other mouse genes are expressed throughout the body, or in multiple tissues.) Geneticists can study the regulation of a mouse gene by fusing the gene’s promoter region to the LacZ coding sequence and injecting the construct to create a transgenic mouse. Fusion of the mouse amylase promoter to LacZ yielded a Pamylase-LacZ construct.
You are surprised to observe that mice homozygous for the transgene insertion display a serious heart defect. (Heterozygotes have normal hearts.) which one is a  possible explanation?
a) LacZ overexpression (with two copies of the transgene) causes the defect.
b) the insertion disrupted a gene that is haploinsufficient.
c) the insertion disrupted a gene that is haplosufficient.
d) LacZ expression inhibition (with two copies of the transgene) causes the defect.
Which of the following statements is correct  predict about the  heart defect?
TLS Online TPP Program

#Question id: 12389

#Unit 7. System Physiology – Animal

In a patient with very high levels of aldosterone and otherwise normal kidney function, approximately what percentage of the filtered load of sodium would be reabsorbed by the distal convoluted tubule and collecting duct?
TLS Online TPP Program

#Question id: 9206

#Unit 9. Diversity of Life Forms

To better comprehend the magnitude of current extinctions, it will be necessary to ________.