This febrile disease with a rash has a pathogen that can cross the placenta and cause serious fetal damage:
A. croup
B. mumps
C. influenza
D. measles (rubeola)
E. rubella
Ans; E. rubella
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A heteroduplex is a DNA double helix that contains mismatches
Indicate whether the statement is true or false
Once glucose has entered a cell, what prevents it from diffusing back out of the cell?
a. Glucose pumps actively transported any leaked glucose back into the cell. b. One side of the cell membrane is permeable to glucose, but the other side is not. c. Glucose inhibitors attach to glucose once it’s in the cell. d. Glucose is phosphorylated, preventing it from leaving the cell. e. Glucose is hydrolyzed into two three-carbon molecules that cannot diffuse in a reverse direction.
Which of the following statements about the Galápagos finches is false?
A) The Galápagos finch species differ in their feeding habitats. B) Each island in the Galápagos chain has one and only one isolated, unique species of Darwin's finch. C) Most speciation events of the Galápagos finches occurred when some finches made it to another island, evolved in isolation, and accumulated enough changes to become a new species. D) The evolution of the Galápagos finches is an excellent example of adaptive radiation.
Organisms that are characterized by being unicellular, photosynthetic and having double shells made of silica are known as
A. kelps. B. diatoms. C. euglenoids. D. dinoflagellates. E. foraminifera.