Treponema pallidum ________.
A. lacks numerous biosynthetic pathways and thus has numerous nutritional requirements
B. requires protein factors found in blood
C. is missing several important genes essential for DNA replication
D. is missing the pathway for peptidoglycan synthesis
Answer: A
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Answer the following statements true (T) or false (F)
1. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 2. Ionotropic receptors act by activating G proteins in target cells. 3. Metabotropic receptors act by initiating changes in second messenger systems in target cells. 4. Meningitis is solely a bacterially caused disease. 5. Synaptic vesicles discharge their contents at the axon hillock region.
Which of the following are not present in plant cells?
a. endoplasmic reticulum b. Golgi complex c. lysosomes d. mitochondria
Which letter indicates the direction of incoming light in a typical vertebrate?
Vision differs from the other senses in two interesting ways. Although most sensory receptor neurons are depolarized when the receive a stimulus, rod and cone cells become hyperpolarized when they receive light. When hyperpolarized, they stop releasing inhibitory neurotransmitter and allow the bipolar cells to fire. A second unusual aspect is that the vision circuit seems to be organized "backwards" -- the light must pass through the layers of ganglion and bipolar cells to reach the rods and cones.
A. A
B. B
C. C
D. D
E. All of the directions are possible.
Respond to the following statements in reference to the five stages of sperm development listed below. Answers may be used more than once or not at all.
A. This continues to undergo mitosis throughout the reproductive life of the male. B. This represents the product of the first meiotic division. C. This is a diploid mitotic product that then undergoes meiosis. D. Haploid cells resulting from meiosis II of a secondary spermatocyte. E. The male sex cell is fully formed at this stage of development.