Most radiolaria have an internal skeleton made of ________.

A. microtubules
B. cellulose
C. glycoproteins
D. siliceous material


Answer: D

Biology & Microbiology

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Which of the following is incorrect about blood cells?

A. They include glial cells. B. They include leukocytes that are either granulocytes or agranulocytes. C. They develop from undifferentiated stem cells. D. After birth, they are produced in red bone marrow sites. E. They include erythrocytes that, when mature, lose their nuclei.

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Lancelets are:a

carnivores. b. filter feeders. c. parasites. d. herbivores. e. algae feeders

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During Angiogenesis signals are sent from cells surface of endothelial cells to ____ and reduces new molecules including enzymes

a. cytoplasm b. nucleus c. ribosome d. proteasome

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As cleavage continues, a zygote forms into a solid multicellular ball called a(n)

A) endometrium. B) morula. C) trophoblast. D) gastrula. E) blastula.

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