Doris Taylor’s research group used detergents to remove all the cells from a cadaveric rat heart, which left behind the natural extracellular matrix. Proteins such as fibronectin, collagen, and laminin held together the rest of the extracellular matrix and maintained the intricate shape of the heart. The researchers then infused this extracellular matrix scaffold with cardiomyocyte progenitor cells. Surprisingly, these cells differentiated and organized into a functionally contracting “recellularized” heart. The behavior of extracellular matrix scaffold can promote the differentiation and rebuilding of a beating heart is analogous to which of the interactions?

TLS Online TPP Program

#Question id: 4569

#Unit 11. Evolution and Behavior

Which of the following must exist in a population before natural selection can act upon that population?

TLS Online TPP Program

#Question id: 19103

#Unit 6. System Physiology – Plant

During infection, most bacteria remain in extracellular spaces and use a specialized mechanism, to deliver bacterial effector proteins into the plant cell that is

TLS Online TPP Program

#Question id: 14965

#Unit 2. Cellular Organization

An exotoxin is a toxin secreted by bacteria. It can cause damage to the host by destroying cells or disrupting normal cellular metabolism. They are highly potent and can cause major damage to the host. Exotoxins may be secreted by bacteria which

TLS Online TPP Program

#Question id: 4974

#Unit 11. Evolution and Behavior

Which of these is the most likely explanation for the modern-day distribution of dicynodont fossils?

TLS Online TPP Program

#Question id: 704

#Unit 1. Molecules and their Interaction Relevant to Biology

The structural classification of proteins (based on motifs) is based primarily on their: