Which one of the following STD's is NOT caused by a virus
Answer: Chlamydia
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Hydrogen bonding is strongest between ____
a. adenine and guanine b. uracil and thymine c. guanine and uracil d. adenine and thymine e. cytosine and guanine
Which of the following contains the three posttranscriptional modifications often seen in the maturation of mRNA in eukaryotes?
A) removal of exons, insertion of introns, capping B) 5'-poly(A) tail addition, insertion of introns, capping C) 5'-capping, 3'-poly(A) tail addition, splicing D) 3'-capping, 5'-poly(A) tail addition, splicing E) heteroduplex formation, base modification, capping
Which statement regarding stem cells is false?
A) Embryonic stem cells can give rise to all the different specialized cells in the body. B) Adult, but not embryonic, stem cells can be grown in laboratory culture. C) Adult stem cells are present in adult tissues. D) Adult stem cells are partway along the road to differentiation.
As replication proceeds in a prokaryotic cell, how many replication forks exist on one chromosome?
A) 1 B) 2 C) 3 D) 4 E) 5