A community of organisms interacting with their physical environment is a(n) ______.
A. population
B. organism
C. biosphere
D. ecosystem
E. macromolecular community
D. ecosystem
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In fast-growing Escherichia coli cells, multiple replication forks of genomic DNA allows binary fission to occur before the genome has been fully duplicated
Indicate whether the statement is true or false.
Match the following items with the correct phrases.
_______1. Phenylethyl alcohol agar and Thayer-Martin agar. _______2. MacConkey agar and mannitol salt agar. _______3. Sabouraud dextrose agar. _______4. Blood agar. a. enriched and differential b. enriched and selective c. selective and differential d. selective only e. differential only
Below is a metabolic pathway having 3 chemical reactions and 3 enzymes. Enzyme 1 has 2 binding sites--1 for the substrate A and another for the end product D. As the pathway proceeds, the end product in higher quantities will react with enzyme 1, blocking the enzyme's binding to the substrate. Which statement is true about this pathway? enz1 enz2 enz3 Substrate A --> B --> C --> D end product
A. Enzyme 1 has an active site and a regulatory site. B. This is a case of noncompetitive inhibition. C. As a result of the inhibition of the enzyme, there will eventually be less substrate converted to the end product D. D. All of the choices are correct.
Which of the following is smallest in diameter?
A) Capillary B) Veni C) Artery D) Venule E) Arteriole