Which of the following statements about transport through phloem is true?
A. Mostly dissolved starch is transported.
B. It is aided by root pressure.
C. Transport only occurs from the roots to the shoot.
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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The minimum level of organization where a
“division of labor” is seen is the __________ level. a. cellular b. organ c. tissue d. organ system e. body
Match the organelle on the left with the appropriate property on the right.
A) transport to various layers of Golgi B) mediates transfer of lysosomal enzymes into a lysosome C) found in plant endosperm or cotyledons D) degradation of damaged organelles E) biosynthesis of steroid hormones F) binds vesicle to target membrane G) transport of proteins from ER to Golgi H) sorting proteins for export or to specific organelles I) ? oxidation of fatty acids J) transport from Golgi to plasma membrane 1 peroxisomes 2 smooth endoplasmic reticulum 3 lysosomes 4 Golgi apparatus 5 transition vesicle 6 shuttle vesicle 7 secretory vesicle 8 glyoxysomes 9 tethering protein 10 mann
Cephalization is associated with bilateral symmetry
Indicate whether the statement is true or false.
In which stages do internal checkpoints occur during the cell cycle?
a. Near the end of G1 and at the G2–M transition b. Only during metaphase c. Near the end of G1, at the G2–M transition, and during metaphase d. Only at the end of the G2–M transition