What period did the dinosaurs go extinct?

a. Quaternary

c. Jurassic

b. Cretaceous

d. Permian

Which sequence lists the hereditary material found inside cells from the smallest unit to the largest unit

Which tissue type, found between the ends of ribs and the bones of the sternum, provides stiff but somewhat flexible support?

Determine which neurotransmitters are released from cholinergic fibers and which are released from adrenergic fibers.

Students in Ms. Johnson's class were using the microscope to study organisms found in a sample of pond water. One student found this specimen: stentor. This protist is relatively large.

Which type of mobilization entails mobilizing all Reserve Component units in the existing approved force structure, as well as all individual reservists, retired military personnel, and the resources needed to meet requirements of a war or other

A scientific name has to refer to what

The changes in the surrounding environment can have an effect on plants too for a few weeks on the autumn season normally green leaves of deciduous plants acquire a red to yellow color how and why does this change in color happen?

Many of the biochemical reactions that occur within cells are catalyzed by enzymes. Which of the following statements is true about most enzyme-assisted reactions?

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain

How do enzymes catalyze chemical reactions (don't just say "they lower the activation energy", give me specific mechanisms) ?