Explain why an energy pyramid in any ecosystem typically is limited to four or five levels only.

Plant or animal which supports a parasite

When not part of a polypeptide, which of the following amino acids have the potential to participate in hydrogen bonding with water? Choose ALL that apply. a. Alanine b. Arginine c. Leucine d. Lysine

Gene expression within the body is controlled by the cells, which determine when a specific gene should or should not be expressed. Influenza (the flu) is caused by a virus that attacks the respiratory system.

If you removed the nucleus from a eukaryotic cell, could it survive?

1) Sammy is performing an experiment to determine how fast the sun can heat a container of water on a warm summer day. He filled a 1L beaker with distilled water and placed it in direct sunlight (the outside temperature is 27 °C.

How are capillaries involved in gas exchange

The specific receptors responsible for rotation found in the semicircular canals is called a. Ampulla b. Vestibule c. Auricle d. Saccule e. Crista

Penicillin is hydrolyzed and thereby rendered inactive by penicillinase (also known as b-lactamase), an enzyme present in some penicillin - resistant bacteria. the mass of this enzyme in staphylococcus aureus is 29.6 kd.

Which of these accurately describes a scientific theory? Select one: A. Theories are statements that describe some aspect of the universe. B. Theories are broad explanations based on many observations and experimer C.

Which Scientists Gave Cells their name while observing cork under a microscope