Photosynthetic electron transport in cyanobacteria takes place ________.
A. on the thylakoid membranes
B. on the plasma membrane
C. in the cytoplasm
D. in the chloroplast
Answer: A
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During fertilization, the acrosome _____
A) prevents polyspermy by releasing enzymes that destroy surrounding sperm B) digests the coatings surrounding the plasma membrane of the egg C) nourishes sperm mitochondria, increasing sperm motility D) injects the sperm nucleus into the egg during fertilization
Which of the following represents an early
stage in primary succession? a. pine trees b. moss and lichens on bare rock c. weedy annual plants in an open field d. climax species in succession e. alder, cottonwood, and willow thickets
Which of the following is not considered part of the process of morphogenesis per se?
a. Cells become specialized. b. Cells migrate into specific areas. c. Certain cells undergo changes in shape. d. Cells become organized into intricate patterns of tissues and organs. e. Some cells undergo apoptosis
The term autotroph refers to an organism that
A. must obtain organic compounds for its carbon needs. B. gets energy by oxidizing chemical compounds. C. does not need a carbon source. D. gets energy from sunlight. E. uses CO2 for its carbon source.