The carrying capacity of Earth for humans is approximately 8 billion people.
Answer the following statement true (T) or false (F)
False
The carrying capacity of Earth for humans has not been determined. Some estimate it may be 50-100 billion people. Others believe we have already exceeded it.
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In DNA profiles, the pattern of bands is _____
a. due to variations in restriction enzyme recognition sites in plasmid DNA b. identical in all individuals c. due to variations in STR alleles between individuals d. due to the presence of transgenes e. possible only when copious quantities of DNA are available
On a short-term basis, water loss in plants may be controlled by the
A. opening of the stomata in the leaves to allow more carbon dioxide to enter. B. closing of the stele in the roots. C. bending of the petioles on the leaves. D. opening the Casparian strips in the roots. E. closing of the stomata in the leaves to limit transpiration.
Currently, which one of the following methods of evaluating disinfectants is used as a standard best-practice methodology?
a) Use-dilution test b) Use-diffusion test c) Disk-dilution test d) Disk-diffusion test
Scientists may compare similar genes in different species and determine what percentage of base pairs is identical. From this, it can be estimated how long ago the two species shared a common ancestor. The validity of this conclusion depends on an
important assumption. This assumption is that: A) all living things use the same genetic code. B) both species belong to the same kingdom. C) the gene codes for a functional protein. D) mutations occur at a fairly constant rate in all evolutionary lines.