Some cyanobacteria are not blue-green, rather they are red or brown; this is due to the presence of the photosynthetic pigment ________.
Fill in the blank(s) with the appropriate word(s).
phycoerythrin
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Consider the following two statements about structural representations of molecules:
1) In a ring structure, an unlabeled atom at the angle where two lines join is assumed to be a carbon. 2) Unlabeled atoms joined to carbons, which are not directly part of a ring structure, are assumed to be oxygens. Determine which one of the statements below is correct. A. Statements 1) and 2) are both true. B. Statements 1) and 2) are both false. C. Statement 1) is true; statement 2) is false. D. Statement 1) is false; statement 2) is true.
Dark-colored solid surfaces
a. have a heating effect on their surroundings. b. have a cooling effect on their surroundings. c. release carbon dioxide. d. increase evapotranspiration.
A pigment appears red if it absorbs red light.
Answer the following statement true (T) or false (F)
Which of the following is true of embryonic stem cells but not of adult stem cells?
A) They normally differentiate into only eggs and sperm. B) They can give rise to all cell types in the organism. C) They can continue to reproduce for an indefinite period. D) One aim of using them is to provide cells for repair of diseased tissue.