In the spiral staircase model of DNA, the rungs
are
a. deoxyribose sugars.
b. hydrogen bonds.
c. nucleotide base pairs.
d. phosphate groups.
e. composed of all of these
C
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Which of these plant tissue types is composed of cells with primary walls thickened at the corners that provide support for immature parts of the cell body?
A. collenchyma B. phloem C. sclerenchyma D. xylem E. parenchyma
Which bacterial genera contain members that are very similar physiologically to Pseudomonas and cause a similar spectrum of opportunistic infections?
What will be an ideal response?
Lizards and snakes are living representatives of which lineage?
a. lepidosaurs b. anapsids c. archosaurs d. synapsids
Organisms that can grow with or without oxygen present are
A) obligate aerobes. B) facultative anaerobes. C) aerotolerant anaerobes. D) obligate anaerobes. E) either facultative anaerobes or aerotolerant anaerobes.