In which of the following cases is RhoGAM not given to the RH- mother in order to prevent hemolytic disease of the newborn?

A) within 72 hours of delivery
B) around the 8th week of pregnancy
C) following an episode of vaginal bleeding during pregnancy
D) subsequent to miscarriage or abortion
E) after amniocentesis or chorionic villus sampling


Answer: B

Biology & Microbiology

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Natural selection is one mechanism to change allele frequency in a gene pool, what is the name of the mechanism that fosters change in allele frequencies due to random chance?

A. Genetic Drift. B. Natural selection also fosters these changes. C. Non-Darwinian evolution. D. Neutral variation. E. Gene flow from one population to another.

Biology & Microbiology

While examining the leaves of an Elodea (a popular water plant) under a microscope, the large green chloroplasts can be seen streaming through the cells as if pushed by a water current. What junction might be the source of this cytoplasmic streaming in the Elodea leaves?

a. desmosome b. tight junction c. plasmodesmata d. gap junction

Biology & Microbiology

Which type of mapping was made possible by technology that allowed exact base pair distances between markers to be measured?

a. cytogenetic mapping b. sequence mapping c. radiation hybrid mapping d. linkage mapping

Biology & Microbiology

The outermost layer of the digestive tract is the:

A) muscularis externa. B) submucosa. C) mucosa. D) serosa.

Biology & Microbiology