In the establishment of rhizobia in a legume, infection threads are found in the:a
stele.
b. cortex.
c. root hairs.
d. xylem.
e. phloem.
C
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The onset of a given epidemic is indicated by a sharp rise in the number of cases reported daily over a brief interval. This indicates that the mode of transmission is
A) host to host. B) a common source. C) insect vector. D) mechanical vector.
Epinephrine raises blood pressure by ____
a. increasing the strength and rate of the heartbeat b. decreasing the strength and rate of the heartbeat c. stimulating vasodilation d. reducing vasodilation e. decreasing blood flow to the heart, skeletal muscles, and lungs
Which part of the sperm contains the chromosomes?
A. flagella B. tail C. middle piece D. cell membrane E. head
Answer the following questions true (T) or false (F)
1. In chemiosmosis, protons funnel through ATP synthase from an area where they are more concentrated to an area where they are less concentrated. 2. The Entner-Doudoroff pathway is a less efficient alternative to glycolysis which likely evolved early in the history of life to catabolize glucose. 3. A bacterial culture which is growing under conditions that only allow for fermentation will grow at the same rate as a culture of the same species growing under conditions which allow for aerobic cellular respiration, all other conditions being identical.