Enzymes are
a. biological catalysts.
b. agents that speed up cellular reactions.
c. proteins.
d. all of the above.
b
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Axopodia of Rhizaria are used for feeding rather than for motility.
Answer the following statement true (T) or false (F)
In the early growth stages of a seedling, what is
responsible for cell enlargement? a. mitosis b. cytoplasmic divisions c. soil minerals d. water uptake e. mitosis and cytoplasmic divisions
Why do chromosomes resemble the letter X when viewed during metaphase?
A) Because they all appear and function as X chromosomes at that stage. B) Because there are two sister chromatids joined at a point in the middle (the centromere). C) Because microtubules encircle and attach pairs of chromosomes to each other at the centromere. D) Because each X-shaped structure is actually four chromosomes joined at the centromere.
In double fertilization, the second fertilization after fertilization of the egg occurs with the
A. polar nuclei. B. pollen. C. synergids. D. carpel.