Enzymes are

a. biological catalysts.
b. agents that speed up cellular reactions.
c. proteins.
d. all of the above.


b

Biology & Microbiology

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Axopodia of Rhizaria are used for feeding rather than for motility.

Answer the following statement true (T) or false (F)

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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

Biology & Microbiology

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.

Biology & Microbiology

In double fertilization, the second fertilization after fertilization of the egg occurs with the

A. polar nuclei. B. pollen. C. synergids. D. carpel.

Biology & Microbiology