Which of the following cells stop dividing once fully formed?
a. bone cells
b. cheek cells
c. liver cells
d. muscle cells
e. nerve cells in the brain
E
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What is an ecological footprint?
A. The estimate of land and water required to sustain one person B. The ecological damage caused by humans C. The amount of land taken up by cities D. The amount of money required to support a human population
RNA replicase is found in ALL viruses to allow the replication and transcription of viral RNA instead of host RNA
Indicate whether the statement is true or false.
Researchers studying the rigidity and flexibility of the cell envelope used chemotaxis to measure the ability of microbes to squeeze through tight spaces. E. coli, a gram-negative bacterium, was able to traverse narrower channels than B. subtilis, a gram-positive microbe, even though both cells are the same size when grown without restriction. E. coli has the more flexible cell envelope because
A. it has only a single membrane. B. lipopolysaccharide has no charge. C. it has fewer flagella. D. there is less structural carbohydrate. E. there are fewer protein receptors.
Which of the following is NOT an example of a sex steroid hormone?
A. estrogen B. progesterone C. prolactin D. testosterone E. estradiol