Cartilage-producing cells occupy small cavities in cartilage called __________, while bone-producing
cells occupy cavities in bone called __________.
a. lacunae; Haversian canals
b. canaliculi; Haversian canals
c. lacunae; canaliculi
d. lamellae; lacunae
e. lacunae; lacuna
E
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The following steps refer to various stages in transmission at a chemical synapse
1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Calcium ions rush into neuron's cytoplasm. 3. An action potential depolarizes the membrane of the presynaptic axon terminal. 4. The ligand-gated ion channels open. 5. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which sequence of events is correct? A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 3 ? 5 ? 4 ? 1 C) 3 ? 2 ? 5 ? 1 ? 4 D) 4 ? 3 ? 1 ? 2 ? 5 E) 5 ? 1 ? 2 ? 4 ? 3
Roots and shoots are similar in that:
A. primary growth in both roots and shoots results from the apical meristem. B. actively growing roots are much thicker than stems. C. the root and shoot apical meristems are both covered by a protective cap when actively growing. D. new meristem in the roots and shoots develop from the pericycle. E. both roots and shoots contain a waxy band around their endodermal cells, protecting the vascular tissue.
Which of the following is not associated with a bacterial ribosome?
A. Its small subunit provides the enzymes for making peptide bonds. B. It is a 70s holoenzyme. C. It has a peptide (P) site. D. It has an exit site. E. It has an amino acid (A) site.
Which of the following metabolic pathways
uses ATP and NADPH that formed in the light-dependent reactions of photosynthesis?
a. the Calvin-Benson cycle b. the Krebs cycle c. glycolysis d. aerobic respiration e. the light-dependent reactions