True or False: All human microbiomes are beneficial to health.
Answer the following statement true (T) or false (F)
False
Consider the microbiome of dental plaque. We go to a lot of trouble to remove plaque because these bacteria damage teeth.
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Eudicot embryos transfer nutrients from endosperm to their two __________. Fill in the blank(s) with the appropriate word(s)
The figure below represents a joint in the hind leg of a grasshopper. The exoskeleton of the leg is indicated by the two pairs of parallel black lines. A muscle that moves this leg is fixed to the skeleton at the end marked with a blue star. When the muscle contracts, it will pull on the tendon at its opposite end. Which configuration shows the most likely arrangement of the exoskeleton and a muscle that increases the flexion of this leg?
A. A B. B C. C D. D
Bacterial IS elements contain
a. a gene for a repressor protein. b. inverted terminal repeats. c. a gene for an accessory protein needed for integration. d. a region with multiple short tandem repeats. e. direct terminal repeats.
There are two properties of phospholipids that affect how tightly they pack together: the length of the hydrocarbon chain and the number of double bonds
The degree of packing, in turn, influences the relative mobility of these molecules in the membrane. Which of the following would yield the most highly mobile phospholipid (listed as number of carbons and number of double bonds, respectively)? (a) 24 carbons with 1 double bond (b) 15 carbons with 2 double bonds (c) 20 carbons with 2 double bonds (d) 16 carbons with no double bonds