Answer the following questions true (T) or false (F)
1. Mammals are the only group of animals to demonstrate significant protection of their young.
2. Blood stays within vessels in a closed circulatory system.
3. In plant life cycles, meiosis produces spores.
1. FALSE
2. TRUE
3. TRUE
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Which of the following does not occur when antidiuretic hormone is present?
A. Water diffuses into the collecting duct from the interstitial fluid. B. The collecting duct walls become permeable to water. C. Aquaporins insert in the membrane of the collecting duct cells. D. The urine in the collecting duct becomes more concentrated. E. All of these events occur when antidiuretic hormone is present.
An enzyme is thought to optimize the fit between substrates by restraining and stretching or squeezing them into
certain shapes and moving them to the transition state, as described by the ____ model of enzyme activity.
a. lock and key b. induced-fit c. template d. activation e. conformational
The approximate diameter of an actin filament is
a. 8-12 nm. b. 7 nm. c. 25 nm. d. 5 mm.
The figure below shows results of bristle number in Drosophila flies after 35 generations of artificial selection. This figure suggests that
A. after 35 generations of selection, populations no longer exhibit variation in bristle number. B. bristle number has evolved beyond the original range of phenotypic variation for this trait. C. natural selection cannot lead to large phenotypic changes. D. at the end of the experiment, "high population" flies were unable to interbreed with "low population" flies.