In order to be completely functional, a T cell must be activated by
A) bone marrow.
B) the thyroid gland.
C) the parathyroid gland.
D) the thymus gland.
E) the lymph nodes.
Ans: B) the thyroid gland.
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An individual who is attracted to light is exhibiting
(a) negative phototaxis. (b) positive phototaxis. (c) negative thigmotaxis. (d) positive thigmotaxis.
Segmentation is the subdivision of the body into segments or metameres. True segmentation is found in which of the following phyla?
A. Annelida, Mollusca, Arthropoda B. Echinodermata, Platyhelminthes, Cnidaria C. Mollusca, Chordata, Annelida D. Arthropoda, Chordata, Porifera E. Arthropoda, Annelida, Chordata
Microbes such as Geobacter metallireducens obtain energy from organic matter under anaerobic conditions by using ferric iron as a(n) ________.
Fill in the blank(s) with the appropriate word(s).
Some evidence that algae are the closest relative to plants is that they both:
a. Have chloroplasts b. Contain chlorophyll a c. Have cellulose rich cell walls d. Use starch as a nutrient reserve e. All are correct