_____ can have similar effects on population sizes as predators; that is, keeping populations below carrying capacity and limiting competitive exclusion
A. Parasites
B. Interspecific competitors
C. Facultative mutualists
D. Commensals
E. Obligate mutualists
A
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In the sodium-potassium pump, sugars and amino acids, or other molecules, are brought through the membrane along with sodium ions through:
A. receptor proteins B. coupled channels C. chemiosmosis D. proton pumps
How is an antiseptic different from a disinfectant?
An antiseptic kills or inactivates all microbial forms but a disinfectant does not destroy endospores. An antiseptic is used to remove or kill microorganisms on tissue, whereas a disinfectant is used to remove or kill microorganisms on inanimate objects. An antiseptic is used to remove or kill microorganisms IN the body, whereas a disinfectant is used to remove or kill microorganisms on the body surfaces. There is essentially no difference and these terms can be used interchangeably.
Why might eating high on the food chain subject humans to higher concentrations of certain toxic substances than eating low on the food chain?
What will be an ideal response?
In the hyperthermophile Pyrococcus furiosus, TrmBL1 simultaneously represses genes for ________ and activates genes for _________ synthesis
a. nitrogen fixation / glutamine b. glutamine synthesis / nitrogen c. nitrogen assimilation / arginine d. sugar transport / glucose