Why can red algae grow at deeper depths of water than green algae? What will be an ideal response?
Green algae have chlorophyll a and b, which do not absorb green light (they reflect, hence the algae
looks green). Conversely, red algae have phycobilins that can absorb green light. As green light can
penetrate to great depths, red algae can perform photosynthesis and live at greater depths.
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The first cells were
a. autotrophic. b. parasitic. c. anaerobic. d. aerobic. e. all of these.
All of the following are said to be filled with empty
calories (i.e., low vitamin and fiber) EXCEPT a. processed white flour. b. processed white sugar. c. brown rice. d. corn syrup. e. all of these.
Which scientist is credited with proposing in 1887 that an egg and a sperm fuse to form a zygote?
A. Muller B. Watson C. Crick D. Fleming E. van Beneden
Answer the following questions true (T) or false (F)
1. Dendritic cells are the histamine-producing cells of the immune system. 2. Stomach acid is one of our natural defenses against bacteria in food. 3. Cytokines are molecules that cut holes in bacterial membranes.