Stromatolites are
A. layered rocklike structures formed by some cyanobacteria (blue-green algae).
B. the earliest known arthropods.
C. found only in rocks of Carboniferous age.
D. the earliest known arthropods and found only in rocks of Carboniferous age are correct.
E. fossilized coral reefs.
A. layered rocklike structures formed by some cyanobacteria (blue-green algae).
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Which of the following can function in signal transduction in plants?
I) calcium ions II) nonrandom mutations III) receptor proteins IV) autochrome V) secondary messengers A) only I, III, and IV B) only I, II, and V C) only I, III, and V D) only II and IV E) only II, III, and V
Varied transcription mechanisms distinguish the different DNA virus Baltimore classes, whereas varied translational mechanisms distinguish RNA viruses
Indicate whether the statement is true or false.
Which statement is true regarding typical plant development?
a. Growing tips and zones are present throughout a plant's life, and final plant form is not influenced by the environment. b. Plant bodies have a fixed final size, and final plant form is influenced by the environment. c. Final plant form is not influenced by the environment, and growing tips and zones are present throughout a plant's life. d. Growing tips and zones are present throughout a plant's life, and plant bodies do not have a fixed final size. e. Plant bodies do not have a fixed final size, and final plant form is not influenced by the environment.
Migration only occurs in vertebrates.
Answer the following statement true (T) or false (F)