Four the following statements are true about the mitochondrion. Which statement is false?
A. It has its own DNA.
B. It has internal membranes.
C. It evolved from chloroplasts.
D. It resembles bacteria in structure.
E. It resembles bacteria in size.
Answer: C
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What are gonads?
A. Organs that produce gametes B. Tubes that allow sperms and ovules to move C. Structures that protect the embryo D. The sites where ovule and sperm meet during reproduction
How does the toxin from Clostridium tetani produce its action?
A) It fuses irreversibly to neurons, blocking release of acetylcholine at synaptic clefts. B) The smaller polypeptide of its toxin can block the release of inhibitory neurotransmitters by inhibitory neurons in the central nervous system. C) It is a pyrogenic toxin, which triggers a diffused rash and, later, sloughing of skin. D) It destroys tissues, including muscle and fat. E) Antibodies to the toxin bind the neuromuscular junctions in skeletal muscle preventing relaxation.
Sunlight resets biological clocks in plants by activating and inactivating photoreceptors called ________
a. statoliths b. jasmonates c. phytochromes d. phototropin