Body cells that have been infected
Immune system is a complex arrangement of cells that functions as the eliminating system in the body by reconizing elements that are not safe in the body. A humoral and cellular can be differentiated. The key players of adaptive cellular immune responses are T lymphocytes. The effector cells are the cytotoxic T lymphocytes. These type of cells express t cell receptors that can recognize an antigen. This will allow them to attach and tag the antigen as a possible threat in the body.
Answer:
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Answer:
The 5' end has free phosphate group while the 3' end has free OH group.
Explanation:
Each DNA strand has two ends that differ from each other with respect to the functional group. The nucleotide present at the 5' end of a DNA strand has a free phosphate group. This phosphate group of other nucleotides of the DNA strand is bonded in phosphodiester bonds. Likewise, the 3' end of a DNA has a free OH group. This makes the two ends of a DNA strand quite different from each other. A DNA new nucleotide can be added to the 3' end due to the presence of a free OH group.
Objects in our solar system are in a spinning motion because THE GRAVITATIONAL PULL OF THE SUN PUSHED OBJECTS INTO A SPINNING MOTION.
The reason why the planets orbit around the sun is because the gravity of the sun keeps them in their circular paths. The gravity is a fundamental part of the universe structure. The planets revolving around the sun traveled in a circular path because they have velocities that are perpendicular to the velocity of the sun.