Bone plays a critical role in providing ____ for the blood
a. sodium and calcium ions
b. magnesium and phosphate ions
c. carbon dioxide
d. phosphate and calcium ions
e. calcium ions and oxygen
D
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The movement of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration is referred to as _____________.
Fill in the blank(s) with the appropriate word(s).
Microorganisms in deep-sea vents and caves serve as autotrophic primary producers in the absence of sunlight
Indicate whether the statement is true or false
Since all living things contain DNA, how can there be so many kinds of living organisms and not just one?
A) all species have the same DNA, but each uses only those sections appropriate for the species B) the order of the bases is unique, not only for each species but for almost every individual as well C) all living things have the same DNA but make variable RNAs when producing the proteins that make each species unique D) different species read or decode the nucleotide sequence in different ways E) this remains one of the great unanswered questions in biology
For some proteins, small molecules are integral to their structure and function. Enzymes can synthesize some of these small molecules, whereas others, called vitamins, must be ingested in the food we eat
Which of the following molecules is not classified as a vitamin but does require the ingestion of a vitamin for its production? (a) retinal (b) biotin (c) zinc (d) heme