Thalidomide is
A) a drug that causes fetal limb defects, but is used to treat leprosy.
B) a drug that causes mental retardation in fetuses, but is used to treat acne.
C) a type of bacterial infection.
D) a vitamin that harms fetuses in megadoses.
A) a drug that causes fetal limb defects, but is used to treat leprosy.
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Despite living their entire lives in saltwater, most marine invertebrates do not struggle with the hypertonic environment. Which of the following explains this phenomenon?
a. Their body fluid concentrations conform to changes in seawater concentration through physiological adaptations. b. Their cells have seawater inside of them, making them isotonic to their environment. c. They absorb extra water at all times to dilute the salt concentration. d. They are capable of metabolizing the salt in vast quantities and excreting the sodium and chlorine.
The type strain is a well-characterized strain to which other strains are compared for inclusion in or exclusion from a particular species.
Answer the following statement true (T) or false (F)
One major difference between bacterial and eukaryotic RNA polymerase is that
a. prokaryotes have several RNA polymerases. b. eukaryotic RNA polymerase can polymerize RNA in the 3? to 5? direction. c. prokaryotic RNA polymerase recognizes several different promoters. d. eukaryotic RNA polymerase has only one polypeptide. e. eukaryotic RNA polymerase cannot read DNA to find the promoter sequence.
Which of the following would be an example of environmental resistance?
A) life span that increases with population size B) food supply increasing along with a population C) bacteria populations producing more toxic waste as they grow D) slow gestation periods