Why does a female have millions of ovarian follicles as a fetus but has perhaps just over a thousand in her early fifties?
A) Several hundred follicles ovulate per monthly cycle and deplete the follicle supply at a steady rate.
B) Natural degeneration of follicles speeds up in later years.
C) Several thousand follicles ovulate per monthly cycle and deplete the follicle supply at a steady rate.
D) Production of new follicles from stem cells slows in her fifties.
Answer: B
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This person is credited with devising powerful microscope
A. Watson B. Darwin C. leeuwenhok D. Hooke E. Koch
Which of the following is an unusual event that occurs as trichomes differentiate?
a. DNA replication b. endoduplication c. cell expansion d. mitosis e. regulation of the cell cycle
A closed circulatory system is seen in:
a. leeches only b. roundworms only c. flatworms only d. cnidarians only e. both earthworms and leeches
Which event occurs during the elongation stage?
a. Peptide bonds form. b. Free amino acids bind to the mRNA binding site. c. Anticodons bind to complementary codons.
d. A stop codon enters the ribosome. e. Peptide bonds form, and anticodons bind to complementary codons.