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TLS Online TPP Program

#Question id: 7108

Relative to the primitive streak and Henson's node, somite formation in the chick embryo occurs:

#Unit 5. Developmental Biology
  1. Anterior to Henson's node, after the primitive steak has retracted past that point.
  2. Posterior to Henson's node, as cells from the lateral portions of the epiblast move in through the primitive streak to become mesoderm.
  3. Adjacent to Henson's node, as the primitive streak migrates toward the anterior of the embryo.
  4. Somite formation occurs simultaneously along the axis, after Henson's node has fully retracted.
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TLS Online TPP Program

#Question id: 23089

#Unit 12. Applied Biology

Rhizosphere biodegradation depends on relationships between green plants and _____.
TLS Online TPP Program

#Question id: 2862

#Unit 2. Cellular Organization

What is the result of regulatory mutation in given lac operon in merodiploids,
TLS Online TPP Program

#Question id: 2745

#Unit 2. Cellular Organization

Which of the following histone pairs forms tetramers in solution?
TLS Online TPP Program

#Question id: 11086

#Unit 7. System Physiology – Animal

A 17-year-old female was bicycling without a helmet when she fell and hit her head. In the emergency room, she was not conscious and was receiving ventilator assistance. Her blood gases follow:

PaO2 = 52 mm Hg,

PaCO2 = 75 mm Hg, pH = 7.15, and

HCO3− = 31 mM

The majority of the CO2 was being transported as
TLS Online TPP Program

#Question id: 5323

#Unit 8. Inheritance Biology

An X-linked recessive gene produces red-green color blindness in humans. A woman with normal color vision whose father was color-blind marries a color-blind man. What is the probability that their son will be color-blind?