Which of the characteristic(s) apply to the supergroup Archaeplastida?
A. They include land plants and the green algae, Chlorophyta.
B. They contain plastids that originated from endosymbiotic cyanobacteria.
C. They include only multicellular organisms that contain plastids.
D. They include multicellular and unicellular organisms.
E. All of these apply.
Answer: E
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Bioluminescence is:
A. emission of flashes of light by organisms B. capture of moonlight for nocturnal photosynthesis C. light absorbed by other pigments and transferred to chlorophyll a D. the fluorescing of Gram-positive bacteria E. none of the other choices provided
Answer the following statements true (T) or false (F)
1. You would not expect a protein synthesis inhibitor to block learning processes in the relevant neurons of Aplysia or yourself. 2. Even single stimuli can activate protein kinase A in presynaptic neurons involved in the gill-withdrawal reflex in Aplysia. 3. New neurons do not appear in the brain of adult vertebrate animals. 4. Activities like playing a musical instrument regularly can affect the size of brain regions involved in performing these activities.
Where do plants get the carbon they use to make organic molecules?
a. glucose b. oxygen c. water d. starch e. carbon dioxide
The Precambrian supereon, in which life first appeared, and diversified to multicellular eukaryotes, lasted approximately ___ of the geologic timescale
Fill in the blank(s) with the appropriate word(s).