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.
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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?
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
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
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