Which of the following statements about transport through phloem is true?
A. It is aided by root pressure.
B. Transport only occurs from the roots to the shoot.
C. Mostly dissolved starch is transported.
D. The direction of flow can change at different times if the sources and sinks change.
E. No energy is required.
Answer: D
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What would be the consequence of deleting the late T4 genes?
A) The T4 genome would not be copied. B) T4 mRNA would not be produced. C) T4 capsid proteins would not be made. D) ATP would not be produced and the T4 genome would not be packaged into the capsid.
The photic zone in aquatic environments is typically about how deep?
A. 10 m B. 50 m C. 100 m D. 500 m E. 1000 m
Matching. Choose the one most appropriate answer
for each. 1. ___ amplitude 2. ___ cochlea 3. ___ eardrum 4. ___ iris 5. ___ oval window 6. ___ pheromone 7. ___ hammer 8. ___ pitch 9. ___ retina 10. ___ round window 11. ___ semicircular canals A. dissipates excess vibrational energy to the middle ear B. contains the organ of Corti C. separates the outer and middle ears D. membrane-covered gateway to inner ear E. consists of tissue containing rods and cones F. bone in middle ear G. peak height and valley depth of sound waves are its basis H. maintain balance and position; detect acceleration I. depends on the number of wave cycles per second J. a substance that elicits a response in members of the same species K. regulates size of pupil and amount of incoming light
The cell membrane is composed of a bilayer of ________. These molecules have regions that are polar and nonpolar and are therefore ________
Fill in the blank with correct word.