Twenty different types of amino acids are used to make proteins

a. True
b. False


True

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology