What type of galaxy is described as revolving around a single point and has spinning arms of stars which extend from the center? spiral
elliptical
irregular
barred spiral

What enzyme is most important for dna replication and why?

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.