What is the main form of nitrogenous waste that is excreted from Malpighian tubules?
a. urea
b. uric acid
c. ammonia
d. nitrate
Ans: b. uric acid
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A blastomere is a ________ and a blastocyst is ________.
A) fetal organ produced by cleavage; an embryonic organ produced by cleavage B) fetal membrane; an embryonic membrane C) cell produced by cleavage; a hollow ball of cells D) solid ball of cells; three-layered embryo
Which of the following allows water to move much faster across cell membranes?
A) the sodium-potassium pump B) ATP C) peripheral proteins D) aquaporins
Urine has some antimicrobial effects because of its
a) flushing action. b) alkalinity. c) enzyme content. d) antibody content.
DNA polymerase is the enzyme that adds nucleotides to make a new strand of DNA. It requires an older strand of DNA to serve as a template, or guide
Answer the following statement(s) true (T) or false (F)