Using a microscope in the science lab, Jill observed two unknown cells: Cell 1 and Cell 2. Cell 1 she identified as a plant cell and Cell 2 as an animal cell. Her teacher told her she identified the cells correctly. What did Jill most likely observe to correctly identify the cells?

A. Cell 2 had a cell membrane and Cell 1 did not.
B. Cell 1 had a cell wall and Cell 2 did not.
C. Cell 2 had a chloroplast and Cell 1 did not.
D. Cell 1 had a nucleus and Cell 2 did not.


B. Cell 1 had a cell wall and Cell 2 did not.

Biology & Microbiology

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Biomagnification is a significant problem in aquatic communities. Levels of chemicals magnify (increase or accumulate) at each new link in a food chain. Use the following information to estimate the level of chemical X in a large-mouth bass. One alga can accumulate 1 unit of chemical X. Each copepod eats 15 algae. A minnow consumes 10 copepods, each large-mouth bass consumes 20 minnows.

A. 3,000 units B. 150 units C. 30 units D. 20,000 units E. 300 units F. 15 units G. 20 units

Biology & Microbiology

Do you believe humans are still evolving? If not, why? If yes, explain in what ways humans may be evolving.

What will be an ideal response?

Biology & Microbiology

The free energy transferred by two electrons from NADH to O2 through the electron transport chain is _______ kcal/mol.

a. +52.5 b. -52.5 c. +7.5 d. -7.5

Biology & Microbiology

A layer of smooth muscle in the wall of this tiny air-conducting tube allows it to regulate its diameter

A) Larynx B) Pharynx C) Alveolus D) Bronchiole E) Trachea

Biology & Microbiology