For a chemical reaction to proceed spontaneously _____.
A) it must occur without an input of external energy
B) the products must have less energy than the reactants
C) it must take place in a very short amount of time
D) the entropy must increase
A) it must occur without an input of external energy
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In what way does epithelial tissue differ from
other types of tissues?
a. it has a basement membrane b. each of the cells has multiple nuclei c. it contains a non-living extracellular matrix d. it is excitable e. more than one of these is a difference between epithelial and other tissue types
Sulfur is an essential element in the human body, and studying its characteristics is important in understanding human physiology. Sulfur atoms have six electrons in their outer shell. Based on this information, which of the following is TRUE?
A) Sulfur is inert. B) Sulfur has eight electrons in its outer shell. C) Sulfur can form important molecules using covalent bonds. D) Sulfur is an important isotope of hydrogen.
Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now experiencing an extinction (loss of biodiversity) crisis?
A) Humans are ethically responsible for protecting endangered species. B) Scientists have finally identified most of the species on Earth and are thus able to quantify the number of species becoming extinct. C) The current rate of extinction is high and human activities threaten biodiversity at all levels. D) Humans have greater medical needs than at any other time in history, and many potential medicinal compounds are being lost as plant species become extinct. E) Most biodiversity hot spots have been destroyed by recent ecological disasters.
In evaluating the credibility of a null hypothesis, it is standard to construct a single value derived from the sample which is known as the:
A. random sample. B. sample standard deviation. C. alternative hypothesis. D. test statistic.