This activity asks you to consider various methods of counting or estimating the size of bacterial populations and to select the method that will provide the most accurate data for plotting a bacterial growth curve. Which of the following methods would be most appropriate for gathering data to plot a bacterial growth curve throughout the four phases?

a. electronic cell counter
b. plate count
c. Any of these methods will provide reliable data for plotting a growth curve.
d. indirect estimate based on turbidity
e. direct microscopic count

Rue or false siblings look simila rbecause they each have some traits of their parents.

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.