The figure shows the number of Hox gene clusters in different groups of animals. Which of the following is true for the number of clusters in each group?
a. land vertebrates > all fish > tunicates
b. all fish > lancelets > tunicates
c. higher ray finned fished >cephalochordate > land vertebrates
d. all fish > cephalochordates > land vertebrates
B
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The Gram stain is used for bacteria that have cell walls while the acid-fast stain is used primarily for wall-less bacteria.
Answer the following statement true (T) or false (F)
Fatty acids and ribozymes are incompatible as early molecules of life because ____
a. they have different pH requirements b. they most likely developed millions of years apart c. fatty acid vesicles are impermeable to ribozymes bound to ferrous oxide d. magnesium is required for ribozyme function but causes fatty acids to precipitate e. magnesium is required for fatty acids to form vesicles but causes ribozymes to precipitate
Several rings of bone matrix in osteon cylinder. Contain collagen fibers that run in different directions in adjacent rings, withstands stress and resist twisting. Bone salts are found between collagen fibers.
What will be an ideal response?
Ebola hemorrhagic fever is caused by which type of virus?
A. filovirus B. rhabdovirus C. paramyxovirus D. rubulavirus E. pneumovirus