The presence of a tympanic membrane in insects and vertebrates is an example of:
A. divergent evolution.
B. coevolution.
C. convergent evolution.
D. adaptive radiation.
C
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In the ovarian cycle, the pituitary gland releases ____
a. estrogen and estradiol b. progesterone only c. progesterone and inhibin d. follicle-stimulating hormone (FSH) and luteinizing hormone (LH) e. gonadotropin-releasing hormone
James Watson and Francis Crick
a. established the double-stranded nature of DNA. b. established the principle of base pairing. c. explained how DNA's structure permitted it to be replicated. d. proposed the concept of the single-helix. e. discovered genes.
A cell spends the most amount of time in which phase?
a. G1 phase b. S phase c. G2 phase d. M phase e. interphase
The particular type of element is determined by the number of:
a. electrons b. protons c. neutrons d. valence electrons e. energy levels