What is the sac that must surround something before it can be actively transported across a membrane? A. Centrosome B. Chloroplast C. Ribosome D. Vesicle

Part A - Access and view the Louisiana Wetlands Loss: Coastal Erosion animation produced by New Orleans Times Picayune. Describe how the process that built the land in south Louisiana could be used to restore wetlands?

1. What is the difference between traits and characteristics? Which is within an individual's control

Describe an example of endosymbiosis that has been observed and documented.

A scientist who wants to study the affects of fertilizer on plants sets up an experiment. Plant A gets no fertilizer, Plant B gets 5 mg. of fertilizer each day, and Plant C gets 10mg. of fertilizer each day. Which plant is the control group.

If an element has 4 electrons, how many of them will be in the second energy level?

The denaturation of proteins in a cell would have a profound effect on which of the following cellular activities? Choose all that apply.

Which of the following is not true of pyrimidines? A. example: thymine B. have a single ring structure C. example: cytosine D. example: adenine

Which class of molecules functions as chemical signals?

How many countries does North America have?

How can the mass of an object be determined in a laboratory? The object is weighed. The dimensions of the object are measured. The object is balanced against standard units of mass. The object is balanced against standard weights.