Twenty different types of amino acids are used to make proteins
a. True
b. False
True
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What are the characteristics of stem cells? Check all that apply.
_____ Totipotent stem cells are part of a committed pathway within one cell lineage that will give rise to one specific cell type. _____ Pluripotent stem cells are descendants of the totipotent stem cells of the embryo. _____ A fertilized egg is a type of totipotent stem cell. _____ Pluripotent stem cells can differentiate into any cell type, except for totipotent stem cells and the cells of the placenta.
The human embryo possesses __________ by the
end of week four. a. pharyngeal arches b. a notochord c. a forming neural tube d. somites e. all of these
Which kingdom contains organisms that obtain their food by absorption through hyphae and never develop from embryos?
A) Protista B) Animalia C) Plantae D) Fungi
Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in alveoli?
A) 100 mm Hg B) 80 mm Hg C) 46 mm Hg D) 40 mm Hg E) 160 mm Hg