A _______ is a product of meiosis and cytoplasmic division in seed plants that gives rise to a pollen grain.
A. megaspore
B. germinate
C. microspore
D. pollen sac
E. pollen tube
Answer: C
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How do sensory cells communicate different types of information to the brain—touch versus light for example?
A. by firing action potentials at different frequencies in the same neuron B. by firing action potentials of varying amplitudes in the same neuron C. by using different neurons for different stimuli (e.g., light and touch) D. by using different kinds of electrical signals in the same neuron as the information is conveyed to the brain E. by using different kinds of receptor potentials in the same neuron
If a pigment absorbed violet, yellow, orange, red, and green light, what color would it appear to be?
a. white b. brown c. black d. blue e. gray
Exotoxins differ from endotoxins in that exotoxins
A) are composed of lipopolysaccharides. B) are stable at 60°C. C) cannot be converted to toxoids. D) are secreted from living cells.
Viruses acquire envelopes around their nucleocapsids during
A. adsorption. B. replication. C. penetration. D. release. E. assembly.