You take a 1-mL sample of pond water and add it to a colorless, viscous media in a small petri dish. When you place it under your dissecting microscope, you see three organisms. Two are struggling to move efficiently through the media, while the third
moves more quickly. You attribute the faster movement to the third organism's
A) thick cell wall.
B) flagella.
C) fimbriae.
D) chloroplasts.
Answer: B
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When antibodies bind antigens, the clumping of antigens results from _____
A) the antibody having at least two binding regions B) disulfide bridges between the antigens C) a complement that makes the affected cells sticky D) bonds between class I and class II MHC molecules E) denaturation of the antibodies
Some major changes that occurred in horse body size, foot anatomy and tooth morphology are hypothesized to be due to natural selection because of ...
A. changes in global climates which resulted in changing environments from forest to grasslands. B. changes in global climates which resulted in changing environments from grasslands to forests. C. changing climates from dry to wet. D. changing climates from wet to dry. E. increase in reproduction of larger animals due to lack of water in the dry environment.
The peripheral nervous system ____
a. carries signals to and from the central nervous system b. is composed of the brain and spinal cord c. is composed of clusters of neuron cell bodies
d. includes sensory neurons only e. is present in radial invertebrates
The human voice is generated by air moving through the _____
a. pharynx b. glottis c. epiglottis d. pleura e. trachea