Which molecule(s) need a transport protein to cross the cell membrane?
a. water
b. carbon dioxide
c. glucose
d. oxygen
e. carbon dioxide and water
c
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Which of the following is the correct order of the levels of DNA packaging in eukaryotic chromosomes?
A) nucleosome ? chromatin fiber ? looped domains ? heterochromatin B) nucleosome ? looped domains ? chromatin fiber ? heterochromatin C) heterochromatin ? nucleosome ? chromatin fiber ? looped domains D) chromatin fiber ? heterochromatin ? nucleosome ? looped domains E) chromatin fiber ? nucleosome ? looped domains ? heterochromatin
A genetic disorder characterized by impaired blood clotting is ____
a. leukemia b. sickle cell anemia c. hemophilia d. atherosclerosis e. hypertension
During the initiation step of transcription, which molecule binds the promoter region of a DNA molecule?
A) DNA polymerase B) Reverse transcriptase C) RNA polymerase D) DNA primase E) Topoisomerase
The majority of foodborne illnesses are reported.
A) True B) False