A(n) ________ is a piece of DNA with a group of genes that are transcribed together as a unit.
A. promoter
B. operator
C. repressor
D. operon
Answer: D
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Sheree is referred to a genetic counselor because a cystic fibrosis (CF) test done as a routine part of her prenatal care indicated that she is a carrier of the most common mutant allele. Sheree is stunned, because no one in her family has the disease. She is 26 years old. The genetic counselor would most likely
A) explain autosomal recessive inheritance and suggest that Sheree's husband be tested for CF. B) explain autosomal dominant inheritance and suggest that Sheree's husband be tested for CF. C) explain autosomal recessive inheritance and suggest that Sheree's parents be tested for CF. D) advise Sheree to have amniocentesis to check the fetus for the CF genotype.
Artifcatual precipitate seen in the Grocott stain may be the result of using:
a) plastic forceps b) gelatin in the water bath c) glassware that was not chemically clean d) excess time in the gold chloride solution
If one is testing a goodness of fit to a 9:3:3:1 ratio, how many degrees of freedom would be associated with the Chi-square analysis?
A) 1 B) 2 C) 3 D) 4 E) 5
In a marine ecosystem with an inverted biomass pyramid, which trophic level should have the smallest number of organisms?
A. Zooplankton B. Primary carnivores (sardines) C. Detritivores D. Secondary carnivores (tuna) E. Phytoplankton