Which statement best describes a cell membrane?
a. it is found only found in animal cells
b. it is a non living structure
c. it controls reproduction in a cell
d. it controls the passage of materials into the cell
Answer: d. it controls the passage of materials into the cell
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Your colleague is studying a newly discovered organism. She is becoming increasingly convinced that the organism is an arthropod. You find that you must respectfully disagree when you note that the organism has a set of distinctly nonarthropod characteristics. The features that cause you to exclude the organism from the arthropod grouping are
A. jointed legs, ecdysis, and an exoskeleton. B. antennae, six legs, and mandibles. C. compound eyes, book lungs, and a hemocoel. D. Malpighian tubules, ommatidia, and tagmata. E. pseudocoel, closed circulatory system, and ventral heart.
Many human behavioral traits
A. show genetic heterogeneity with the same phenotype resulting from different genes. B. are due to dominant genes. C. are a result of mutations in structural genes. D. show genetic heterogeneity with the same phenotype resulting from different genes and are due to dominant genes. E. none of these.
Which chamber of the heart receives the deoxygenated blood from the systemic system first?
A) left ventricle B) left atrium C) right atrium D) right ventricle
In which situation can a mixture always be called a solution?
A. when one of its components is a gas B. when there is no solvent in the mixture C. when its components are made up of different types of particles D. when the mixture is homogeneous