Which of the following specialized structures is
NOT correctly paired with a function?
a. gullet; ingestion
b. cilia; food gathering
c. contractile vacuole; digestion
d. contractile vacuole; water balance
e. pellicle; flexible support
Answer: c
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A researcher discovers a new species of fungi that forms hyphae, but not septa. This fungus also lacks multicellular fruiting bodies, and does not appear to form either endomycorrhizae or ectomycorrhizae with plants. How should this fungus be classified?
A. as a zygomycete B. as a chytrid C. as an ascomycete D. as a glomeromycete E. as a basidiomycete
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.
During replication, which enzyme unwinds the two strands of the DNA molecule from one another?
A. Helicases B. Ligases C. Unwindases D. Primases
Suppose that you have discovered a new mutant in Drosophila melanogaster. The trait is known to be sex linked
Which crosses should you perform to determine if the mutant trait is recessive or dominant?
What will be an ideal response?