Which one of the following cellular components is NOT directly involved in synthesis or secretion of
molecules in the cell?
a. ribosomes
b. lysosome
c. rough endoplasmic reticulum
d. Golgi complex
e. smooth endoplasmic reticulum
B
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Most simple invertebrates obtain their oxygen by diffusion directly from the surrounding
A. mud. B. air. C. water. D. blood.
Which of these characteristics is not found in both land plants and green algae?
1.cellulose in their cell walls 2.produce spores in sporangia 3.store energy captured during photosynthesis as starch 4.light-absorbing pigments include both chlorophyll a and chlorophyll b
Describe some of the various activities performed by membrane proteins in multicellular organisms. What will be an ideal response?
Protein which serve as "spools" to help organize chromatin are called _______.
Fill in the blank(s) with the appropriate word(s).