What type of macromolecule acts as a catalyst in biological systems?

What are four major classes of organic molecules?

Arteries must be thicker than veins to be able to withstand the high pressure the heart exerts as it pumps blood into them. As blood travels through the body, this pressure decreases.

Where on earth are single-celled organisms generally found?

What is a cilia example

Which of the following is an example of sound refraction? a). sound waves bouncing off a canyon wall to create an echo b). reverberations in a concert hall c). a high pitch sound changing to a low pitch sound d).

Is the effect of light on flowering patterns of plants independent or dependent?

The relationship between transcription and translation?

Which of the following is a sterile part of a flower? my choices are: pistil stamen sepal none of the above

What is the name of the science tha deals with taking x-rays

How do proteins travel from the endoplasmic reticulum to the Golgi apparatus? A. A part of the endoplasmic reticulum pinches off, forming a transport vesicle. B. A protective coating around the protein transports it to the Golgi apparatus. C.