Which structure is not part of the shoot system?
a. stems.
b. leaves.
c. lateral roots.
d. axillary buds.
b
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Which of the following DOES NOT correctly complete this statement: The MHC (major histocompatibility complex) is important in
A. distinguishing self from non-self. B. recognizing infected cells. C. identifying bacterial pathogens. D. identifying abnormal cells. E. presenting antigenic determinants.
In the accompanying figure, ionic bonds would form between the R groups of which amino acids?
a. 1 and 3
b. 2 and 4
c. 3 and 5
d. 4 and 6
e. 3 and 6
What are all the conditions that must be observed in order for a contraceptive diaphragm to be effective?
Which of the following is NOT a way plants affect life on Earth?
A. Top of food webs B. Habitat for microscopic and macroscopic organisms C. Fuel source directly as nutrition and indirectly as wood and coal D. Prevent erosion of landscape by rooting into soil and other substrates E. Provide oxygen that forms the ozone layer