When does centriole replication occur in the cell cycle?
a. during S
b. during G1
c. during prophase
d. during G2
Ans: d. during G2
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Studies show that the worldwide age for onset of puberty, particularly early breast development, has begun earlier each decade. In fact, between 1991 and 2006, the age for onset of breast development in girls adjusted by a full year (from a mean age of 10.9 to 9.9). While several theories have emerged about what is causing the earlier presence of female sex characteristics, one prominent theory is that it is due to ubiquitous early exposure to hormones in food products from the agricultural industry. If you were a researcher in this field, which of the following hormones would you look for in food?
a. testosterone b. LH c. estrogen d. FSH
Which greenhouse gas can be generated in the guts of cattle?
a. carbon dioxide b. nitrous oxide c. oxygen d. chlorofluorocarbons e. methane
The body of a fungus is generally composed of
A) cellulose. B) vascular tissue. C) mycorrhizae. D) hyphae. E) mold.
The 8,000 species in this group have countless rows of cilia.
A. cellular slime molds B. water molds C. plasmodial slime molds D. ciliates