#Question id: 1725
#Unit 4. Cell Communication and Cell Signaling
What is the single cell type most characteristically associated with the mucosa-associated lymphoid tissue (MALT)?
#Question id: 27511
#Unit 2. Cellular Organization
Which of the following is true when a Intercalation of ethidium ion into the DNA takes place
a. It unwind the two base pair by 260
b. Reduces the normal rotation per base pair from 360 to 100
c. Increases the normal rotation per base pair from 100 to 360
d. It first removes the negative supercoils and then introduces positive supercoils
#Question id: 6974
#Unit 5. Developmental Biology
Where are the stem cells that renew the epithelium of the gut found?
#Question id: 4972
#Unit 11. Evolution and Behavior
Fossils of Lystrosaurus, a dicynodont therapsid, are most common in parts of modern-day South America, South Africa, Madagascar, India, South Australia, and Antarctica. It apparently lived in arid regions, and was mostly herbivorous. It originated during the mid-Permian period, survived the Permian extinction, and dwindled by the late Triassic, though there is evidence of a relict population in Australia during the Cretaceous. The dicynodonts had two large tusks, extending down from their upper jaws; the tusks were not used for food gathering, and in some species were limited to males. Food was gathered using an otherwise toothless beak. Judging from the fossil record, these pig-sized organisms were the most common mammal-like reptiles of the Permian. Anatomically, what was true of Lystrosaurus?
#Question id: 10966
#Unit 7. System Physiology – Animal
A
couple requests blood typing of their 2-year-old child (father AB, Rh-negative;
mother B, Rhnegative). Results of hemagglutination assays of the child’s blood
are shown in the next figure. Which of the following conclusions concerning the
child’s parentage is valid?
