What advantages does chorionic villus sampling have over amniocentesis for fetal analysis of genetic defects?
What will be an ideal response?
Chorionic villus sampling is generally performed up to four weeks earlier than amniocentesis, allowing parents to make an earlier decision regarding potential termination of pregnancies. It is also a faster test that does not require cell culture to do biochemical assays.
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The site where the two original DNA strands separate and active replication occurs is called the
A. replication fork. B. replisome. C. primosome. D. lagging strand. E. sliding clamp subunit.
Which has the greatest affinity for carbon monoxide?
a. The heme group in hemoglobin associated with the polypeptide chain of hemoglobin. b. The heme group in hemoglobin unassociated with the polypeptide chain of hemoglobin. c. The heme group in myoglobin associated with the polypepetide chain of myoglobin. d. The affinity is the same for heme groups in hemoglobin or myoglobin associated or unassociated with the polypeptide chains of hemoglobin or myoglobin. e. The heme group of mutated myoglobin.
Bird song
a. has to be heard before a bird can sing it. b. is learned during early life. c. is specific for each bird species. d. has a genetic component. e. includes all of these.
As cleavage continues, a zygote forms into a solid multicellular ball called a(n)
A) endometrium. B) morula. C) trophoblast. D) gastrula. E) blastula.