Which type of algae is believed to have generated much of our current petroleum reserves?
A) Chrysophyceae: The Golden-Brown Algae
B) Phaeophyceae: The Brown Algae
C) Bacillariophyta: The Diatoms
C) Bacillariophyta: The Diatoms
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Which organ releases hormones that assist with the development of the immune system and continues to shrink as an individual matures and ages?
a. thymus b. thyroid c. thalamus d. testes
Which of the following is NOT an antibody class in humans?
a. IgA b. IgD c. IgE d. IgF e. IgG
The 30-cm floral tube of the flower Angraecum and the 35-cm proboscis of its hawk moth pollinator are the result of
a. preadaptation. b. adaptive radiation. c. coevolution. d. convergent evolution. e. key innovation.
You isolate a cell with the following characteristics: (1 ) no nucleus, (2 ) only a single type of organelle, and (3 ) 2 ?m in size. This cell could be a/an:
A) animal cell. B) plant cell or an animal cell. C) plant cell. D) bacterial cell or a plant cell. E) bacterium.