The coronary arteries that bring blood to the heart branch off from the:
A) aorta. B) pulmonary artery. C) vena cava. D) pulmonary vein.
Answer: A
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All of the following are roles of microfilaments except
A) mitotic spindle formation. B) muscle cell contraction. C) amoeboid movement. D) cytoplasmic streaming. E) cell migration.
All of the following animals have placentas EXCEPT
a. kangaroos. b. opposums. c. echidnas. d. koalas. e. wombats.
Craig Venter and Claire Fraser are working to create a "minimal organism.". They are starting with Mycoplasma genitalium, a bacterium that has 517 genes. By disabling its genes one at a time, they discovered that 265–350 of them code for essential proteins. The scientists are synthesizing the essential genes and inserting them, one by one, into an engineered cell consisting only of a plasma
membrane and cytoplasm. They want to see how few genes it takes to build a new life form. What properties would such a cell have to exhibit for you to conclude that it was alive? What will be an ideal response?
The discontinuous aspect of replication of DNA in vivo is caused by ________
A) topoisomerases cutting the DNA in a random fashion B) trinucleotide repeats C) polymerase slippage D) the 5? to 3? polarity restriction E) sister-chromatid exchanges