Research on conditions that are relatively new to human populations such as myopia, breast cancer, and obesity support the conclusion that ________
A) human populations have accumulated a number of mutations that have become fixed by genetic drift
B) the changes in human lifestyle account for all of the increase in frequencies of these conditions
C) these conditions are indeed "diseases of civilization" and are likely caused by the interaction between genes (genetic susceptibility) and novel environments
D) these human conditions are mere artifacts of the way in which they have been evaluated
C
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Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions. B. a boundary membrane that separates external from internal environments. C. the ability to exclude all organic substances. D. the ability to fuse with any other protobiont for reproduction. E. the ability to recognize other protobionts for developmental purposes.
Which type of epithelial cells act in absorption and secretion?
a. Columnar and stratified squamous b. Columnar and cuboidal c. Simple squamous and columnar d. Cuboidal and simple squamous e. Stratified squamous and columnar
Most likely, about 10 percent of all species go extinct every million years
Indicate whether the statement is true or false.
A new operon is discovered in bacteria. Transcription of the genes in this operon is blocked by the binding of a protein
to DNA sequences upstream of the operon. This is an example of ____ control. a. positive b. negative c. constitutive d. posttranscriptional e. inducible