The cell membrane of the red blood cell will allow water, oxygen, and carbon dioxide to pass through. Because other substances are blocked from entering, this membrane is called:

A. perforated
B. semi-permeable
C. non-conductive
D. permeable


B. semi-permeable

Biology & Microbiology

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Gymnosperms that produce resin, form male and female cones, and consist of tracheidbased xylem are classified as:

A. conifers. B. ginkgos. C. cycads. D. gnetophytes.

Biology & Microbiology

The photosynthetic systems of algae living in deeper water are adapted to absorb more of the light of which of the following colors?

A. yellow B. red-orange C. blue-green D. purple E. white

Biology & Microbiology

A woman has a child using intrauterine insemination. The woman is the child's

A) gestational mother only. B) genetic mother only. C) gestational and genetic mother. D) gestational and surrogate mother.

Biology & Microbiology

Which of these organisms most contributes to the global methane oxidation and greenhouse gas conversion?

A. Chlamydia trachomatis B. Bacteroides fragilis C. Treponema pallidum D. Acidimethylosilex fumarolicum

Biology & Microbiology