Which of the following best describes the function of the RecA protein in E. coli recombination?
A. Promotes strand invasion and formation of the D loop
B. Recognizes double-stranded breaks in the DNA
C. Is involved in the initial formation of the Holliday junctions
D. Resolves Holliday junctions into separate chromosomes
A
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The tetanus toxin blocks the release of __________
and glycine from certain neurons, causing muscle __________ and death from __________ and cardiac failure. a. GABA; spasms; respiratory b. ACh; spasms; respiratory c. GABA; relaxation; digestive d. ACh; relaxation; digestive e. GABA; relaxation; respiratory
A horse has a diploid number (2n) of 64 and a donkey has 2n = 62. The hybrid of these two species, mules, have 2n = 63 and are sterile. Why are mules sterile?
A) Mules cannot physically mate with each other. B) Horses are not able to form new species. C) Mules are not true hybrids. D) One chromosome is unpaired and fails to divide properly during meiosis. E) Mules cannot physically mate with horses and donkeys.
In the ________ circuit, blood leaving the ________ ultimately delivers oxygen and nutrients to all of the body's tissues and organs
A) pulmonary; lung capillaries B) systemic; vena cava C) pulmonary; myocardium D) systemic; left ventricle
At a plant’s light compensation point the rate of photosynthesis is greater than the rate of respiration
__________________ Indicate whether the statement is true or false.