How do some inhibitors slow down metabolic pathways when the products of the pathways are not needed but still allow a pathway to proceed when the products are needed?
A. Inhibitors promote an induced fit between a substrate and an enzyme's active site.
B. feedback regulation
C. enzyme activation
D. Inhibitors usually degrade enzyme molecules.
B. feedback regulation
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"Seeds" of ancient lycophytes (existing over 300 million years ago) had which of the following characteristics? Select all correct choices
A. a haploid (1n) female gametophyte B. a diploid (2n) embryo C. a storage area for haploid (1n) male gametes D. a seed coat
Nonfermenting gram-negative rods isolated from respiratory samples from cystic fibrosis patients are difficult to identify using commercial systems. Thus, other testing platforms are being used to aid in accurate species identification. Which of the following systems has the advantage of a large curated database of proteomic profiles representative of many microorganisms and can give definitive
organism identification within minutes? a. Cellular fatty acid analysis b. MALDI-TOF mass spectrometry c. Multilocus sequence typing d. Ribotyping of 16S rRNA gene
Deserts typically form at ____ latitude where
____. a. 30 degrees; warm dry air descends b. 60 degrees; warm dry air descends c. 0 degrees; there is intense sunlight d. 60 degrees; warm dry air ascends e. 75 degrees; rising air picks up moisture
If you put 20g of food in 180ml of sterile water and blend, what dilution factor does this represent?
A) 1:10 B) 1:100 C) 1:1000 D) This is not a dilution.