Which of the following is necessary to move substances against an electrochemical gradient?
a. Energy from ATP
b. Highly dense solvents
c. Isotonic solutions
d. Particles from vacuoles
a. Energy from ATP
Energy from ATP is necessary to move substances against an electrochemical gradient
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Which of the following is not evidence supporting the Lyon hypothesis of X inactivation?
A. Female mammals that are heterozygous for X-linked traits are phenotypically mosaics. B. A highly condensed structure is consistently observed in female cells, but not in male cells. C. A female cat that is homozygous for coat color cannot produce calico offspring. D. Calico patterns of coat color are never exactly the same. E. A genetically normal male cat can never be calico.
There was a massive immigration of Irish to the United States in the mid-19th century because of a failure of the Irish potato crop caused by:
A. Trichomonas vaginalis B. Plasmodiuim falciparum C. Phytophora infestans D. Giardia lamblia E. Spudsik emeraldensis
The three domains of life are ____
a. eukaryotes, prokaryotes, and viruses b. animals, plants, and microorganisms c. Prokaryota, Eukaryota, and Protostista d. Archaebacteria, Eubacteria, and Eukaryota e. Archaea, Bacteria, and Eukarya
A diploid organism contains _____
a. several copies of the same chromosomes b. only autosomes c. one copy of each chromosome d. chromosomes of equal size e. two of each type of chromosome