Gene Structure

The genes that code for many proteins are broken into pieces. These pieces—the exons—are separated by stretches of noncoding DNA—the introns

TLS Online TPP Program

#Id: 7933

#Section 3: Genetics, Cellular and Molecular Biology

Signal sequences

contain one or more positively charged amino acids adjacent to a continuous stretch of 6–12 hydrophobic residues (known as the hydrophobic core)

TLS Online TPP Program

#Id: 8411

#Section 3: Genetics, Cellular and Molecular Biology

In the absence of Ca2+, muscle is relaxed

TM blocks myosin’s interaction with F-actin

TLS Online TPP Program

#Id: 8215

#Section 3: Genetics, Cellular and Molecular Biology

Autophagy can be either

• Nonselective autophagy

• Selective autophagy

TLS Online TPP Program

#Id: 10317

#Section 2: General Biology

Cytotoxic T Cells target tumor cells

Most tumor cells, express MHC class I molecules on their surface, cytotoxic T cells can directly recognize them. 

cytotoxic T cells can result in killing of the tumor cells by two different mechanisms

TLS Online TPP Program

#Id: 9176

#Section 3: Genetics, Cellular and Molecular Biology

Adaptation is a characteristic that enhances the survival or reproduction of organisms .

Adaptations have evolved by natural selection, which is the centerpiece of On the Origin of Species