The discovery that some bacteria ____ using enzymes that cut the viral DNA into pieces was one of the first steps in the development of recombinant DNA technology
a. exchange fused plasmid DNA
b. restrict important nutrients from leaving the bacterial cell
c. resist viral infection
d. cut up and recycle mRNA transcripts
e. attach amino acids to tRNA molecules
c
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Lysosomes maintain an acidic environment by actively pumping protons into their interior.
Answer the following statement true (T) or false (F)
In order for a muscle to contract, calcium ions released from the sarcoplasmic reticulum must bind to
A. troponin. B. myosin. C. tropomyosin. D. ATP. E. actin.
The division of the PNS that regulates the activity of cardiac and smooth muscles, organs, and glands is the Blank 1 of 1 system.
a. somatic b. autonomic c. sympathetic d. parasympathetic
Turtle hatchling survivorship rate is low in many turtle species due to predation. Amanda researched the predatory rate on a species of turtle eggs in the Red River. The eggs were harvested from trapped turtles, and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. Research suggests that predators use the female's cloaca scent to locate the eggs.The eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. The nests were monitored by cameras and manually on foot, and data on nest predation was recorded.Based on the experimental design, what is the independent variable?
A. inducing egg laying B. time eggs spent in ground C. number of hatchlings D. no cloaca film on eggs