Scientists use a certain technique to measure RNA levels in various cell types. which of the following is most directly observed by this technique?

a. mutation

b. cell division

c. gene expression

d. osmotic regulation

Which of the following occurs in the trp operon? A. The operon is usually off. B. The operon is usually on. C. The active repressor binds to the operator to stop transcription. D.

Over millions of years, hominid species learned to use and create tools that became more complex over time. They eventually shaped stone into knives used for cutting, and they harnessed fire for light, heat, and cooking food.

What are the four phases of mitosis in order from start to finish?

What did charles darwin call the ability of an organism to survive and reproduce in its specific environment

Which female is most probably the mother?

Which of the following statements is true? Tsunamis happen when backwash is stronger than swash. Mudflows are the slowest form of slope failure. Weathering is the movement of sediment from one location to another.

Where is a proton located in the atom?

List the ways in which tadpoles turn to frogs

How do oxbow lakes form

When alzheimer disease appears in middle age rather than old age, it: a. progresses more slowly. b. progresses more rapidly. c. causes death within a year. d. is benign?