_____ consists of nucleotides

a. Sugars c. RNA
b. DNA d. DNA and RNA


D

Biology & Microbiology

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What is the basis of the food chains in pelagic ecosystems?

a. Detritus b. Zooplankton c. Phytoplankton d. Seaweeds

Biology & Microbiology

Which of the following is true concerning

white muscle fibers and red muscle fibers?

a. white muscle fibers have more mitochondria b. red muscle fibers have no myoglobin c. white muscle fibers make ATP by aerobic respiration d. red muscle fibers fatigue less easily e. red muscle fibers get most of their ATP thanks to creatine phosphate

Biology & Microbiology

Gardasil HPV vaccine consists of

a. viral capsid proteins that assemble into virus like particles (VLPs). b. inactivated HPV. c. synthetic HPV. d. antibodies from infected patients. e. none of these

Biology & Microbiology

Photons excite electrons in chlorophyll. These electrons are then trapped by the primary electron acceptor. How does the photosystem replace the trapped electrons?

a) The photosystem replaces its light-excited electrons by extracting electrons from oxygen. b) These electrons are not replaced. A molecule of chlorophyll in a photosystem is used up with each electron transferred. c) The photosystem replaces its light-excited electrons by extracting electrons from water. d) The photosystem replaces its light-excited electrons by extracting electrons from carbon dioxide. e) These electrons are not replaced. There are hundreds of millions of free electrons available in the photosystem at any particular time.

Biology & Microbiology