Water molecules are attracted to each other due to the opposite charges created by partial charge separations within the molecules. These attractions are called:
A. peptide bonds.
B. covalent bonds.
C. ionic bonds.
D. hydrogen bonds.
E. double bonds.
D
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Amino acids that cannot be manufactured by the human body are called ____________________
Fill in the blank(s) with correct word
because an spermatogonia has 23 pairs of chromosomes, after the 2 divisions of meiosis the chromosome number is reduced to 11.5 in each sperm and therefore it takes 2 sperm to fertilize 1 egg
a. true b. false
Any relationship in which one organism lives and feeds either inside or on the outer surface of another organism, harming the organism in the process, is classified as
a) commensalism b) parasitism c) none of the other choices d) mutualism
All of the following are found in DNA EXCEPT
A) a phospholipid group. B) deoxyribose. C) a phosphate group. D) guanine. E) thymine.