Which statement about egg development is true?
A) Eggs without a nucleus cannot initiate division.
B) A second messenger system is activated following fertilization.
C) The sperm and egg micronuclei have fused by the end of the cortical reaction.
D) The contents of the cortical granules contribute to the fast block to polyspermy.
E) The mRNA involved with early activation of the egg arises from the sperm nucleus.
Answer: B) A second messenger system is activated following fertilization.
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Recent discoveries of fossils that surprisingly retain some coloration are the result of the preservation of:
A. preserved proteins. B. preserved DNA in the nucleus of a cell. C. preserved lipids such as cholesterol. D. cellular melanosomes that produced pigments.
An antimicrobial drug that inhibits the growth of bacteria without affecting the growth or function of cells in the human host is described as being ___________ ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements applies to the semiconservative nature of DNA replication?
A. The new strand serves as a template for the old strand. B. The old strands serve as a template for the new strand. C. The old strand is pulled apart and reformed into the new strand. D. None of these statements apply to the semiconservative nature of DNA replication.
Complementary base pairing links
a. nitrogenous bases b. amino acids c. proteins d. phosphate group