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

Biology & Microbiology

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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

Biology & Microbiology

A genetic disorder characterized by impaired blood clotting is ____

a. leukemia b. sickle cell anemia c. hemophilia d. atherosclerosis e. hypertension

Biology & Microbiology

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

Biology & Microbiology

The majority of foodborne illnesses are reported.

A) True B) False

Biology & Microbiology