Which type of t cell is involved in activating macrophages and stimulating development of cytotoxic t cells?

performs the following experiment. She wants to replicate a test strand of DNA using wildtype of Saccharomyces cerevisiae (budding yeast) and two mutants which she calls poor-rep1 and poor-rep2.

What is a group of cells that secrete substances into the blood or directly into an organ

Covalent bonds are in the air you breathe and the water you drink. How are covalent bonds formed? between atoms with more electrons than protons between atoms that share electrons between atoms with more neutrons than protons

Immune system cells differentiate healthy versus unhealthy cells in the body by examining what part of the cell?

Could chromosomes 2 be homologous with chromosome 1?

Which characteristic of life relies on the sun? adaptation using energy cell structure reproduction?

These are organisms that are brought into a new environment, sometimes accidentally, sometimes on purpose; and have no natural enemies or controls.

You decide that the introduction should also discuss the extremophiles that are referred to as the archaea.

Banff and Minsk are located at similar latitudes. What could account for Banff's average yearly temperature being lower than Minsk's?

What you think can be done to reduce levels of carbon dioxide in the atmosphere