What type of t cell can directly attack and kill other cells?

State one reason satellites are useful for communication

Suppose the protein specified by bicoid was injected into drosophila embryos, so that a high concentration was present everywhere in the embryo. what might be the result of such an experiment

What are 5 main chemicals that make all living things?

Channels within the structure of the cell membrane are composed of A) carbohydrates. B) disaccharides. C) phospholipids. D) proteins.

Which best explains the function of producers in a forest ecosystem

As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato.

What's the difference between transgression and marine regression

In DNA adenine levels were equal to thymine levels and cytosine levels were equal to guanine levels.

In this field of sunflowers, variation exists. Some flowers are tall, others short, and finally some plants are an intermediate height. The tallest plants shade the shorter; the taller plants are pollinated first.

What is a major use for the water humans are withdrawing from the ground?