Viral infections in humans spread via the circulatory system. Viral infections in plants spread from cell to cell via:a
pili.
b. endocytosis.
c. infected seeds.
d. plasmodesmata.
e. transformation.
d
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The metabolic diversity of photosynthetic bacteria stems from different
A) bacteriochlorophylls and pigments they contain. B) chlorophylls they can have and organic compounds they can produce. C) light-harvesting complexes, electron donors, and organic compounds they produce. D) unrelated taxa capable of photosynthesis.
The electrons that are passed to NADP+ during the
noncyclic pathway are obtained directly from __________ but ultimately from __________. a. chlorophyll; water b. CO2; chlorophyll c. ATP; O2 d. water; chlorophyll e. NADPH; chlorophyll
In fruit flies normal wings are dominant over vestigial wings. If a homozygous normal-winged fly and vestigial-winged fly were crossed, what would the phenotype of the fly offspring be?
A. all vestigial-winged B. all normal-winged C. three normal: one vestigial-winged D. one normal-winged: two half-winged: one vestigial-winged
When a neuron is at its "resting potential," which of the following is true about the concentration of sodium ions?
A) Sodium ions have a greater concentration outside the neuron's cell membrane. B) The sodium concentration is the same outside and inside the neuron's cell membrane. C) Sodium ions have a greater concentration inside the neuron's cell membrane.