Which of the following is not a characteristic of proteins?
A) High molecular weight
B) Presence of nitrogen
C) Presence of amino acids
D) Presence of nucleic acids
E) Structure built of one or more polypeptides
D
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Bacteria that can absorb light energy and convert it into ATP are commonly called
A. cytochromes. B. lysosomes. C. chemotrophs. D. phototrophs. E. cytochromes AND chemotrophs.
Which structures are part of the same primary germ layer?
A) skin, tooth dentin, tonsils B) muscle, kidneys, dermis of skin C) bones, blood, thyroid gland D) uterus, bladder, pituitary gland
List in order the steps associated with a reflex arc of the PNS.
What will be an ideal response?
Which characteristic promoted the utilization of lipids as the first cell membrane?
A) spontaneous degradation of the intracellular environment B) self-assembly into a simple membrane C) ability to form an impermeable membrane D) formation of a semi-solid membrane