What is the half-life of the radioactive isotopes? a. A radioactive isotope decreased to one-half its original amount in 18 months.

Which of the following processes occurs inside the chloroplast of a plant cell? Choose ALL that are correct. (There will be multiple answers) Carbon dioxide is produced. Oxygen is produced. Sunlight is trapped. Glucose (sugar) is produced.

Modern h. sapiens differ from the archaic form in that moderns have

2. Describe a controlled experiment you could per- form to determine whether ants are more attracted to butter or to honey?

Mark is studying jellyfish in a small body of water. Mollusks are a primary food source for jellyfish, and a large number of mollusks have recently been harvested from the area. How will this impact the carrying capacity for the jellyfish?

Where on the phylogenetic tree should the origin of chloroplasts appear?

Which of the following is descriptive of pertussis? a. Initial stage resembling the common old b. Prolonged illness, sometimes symptoms may last for months. c. Bacterial disease treated with erythromycin c. All of these are descriptive of pertussis

Which statement about the cell membrane is true? A. It contains cellulose and sugars that are involved in communication. B. It is present in animal cells only. C. It is rigid and elastic for supporting the cell's shape. D.

Hailey needs to identify internal costs so she can price her product accordingly. Which cost will be part of Hailey's calculation? A. cost of endangering species B. cost of deforestation C. cost of air pollution D. cost of disposing by-products E.

What is the main difference between prokaryotic and most eukaryotes cells? A. Eukaryotic cells from multi-cell tissues, Prokaryotic cells are single cell. B. Eukaryotic cells from single cell, Prokaryotic cells are multi-cell tissues. C.

List (A) the primary materials necessary for and (B) The materials produced by photosynthesis