Which of the following is referred to as a hollow ball of cells?
a. cleavage
b. egg
c. gastrula
d. zygote
e. blastula
ANSWER: e
Biology & Microbiology
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The bran of the seed contains primarily
a. lipopolysaccharides. b. proteins and vitamins. c. fiber and minerals. d. fructose. e. none of these.
Biology & Microbiology
Metabotropic receptors act by initiating changes in second messenger systems in target cells.
Answer the following statement true (T) or false (F)
Biology & Microbiology
When electrons in a covalent bond are not equally shared, the molecule is said to be
A. polar. B. nonpolar. C. lopsided. D. unable to form hydrogen bonds.
Biology & Microbiology
What form of nitrogen can most plants absorb and use directly?
A) nitrite and nitrate B) nitrate only C) ammonium and nitrogen gas D) nitrate and ammonium
Biology & Microbiology