Miller was the first to show that
A) amino acids and other organic molecules could have formed under conditions thought to resemble those of early Earth.
B) the earliest forms of life were photosynthetic rather than heterotrophic (obtaining energy from organic sources).
C) RNA spontaneously assembles from inorganic precursor; thus the earliest forms of life had an RNA genome.
Answer: A
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The expression "knee-jerk reaction" refers to someone doing something automatically without thinking. What does this expression mean in biological terms?
A) In the nervous system, this expression implies the involvement of higher brain regions before executing a spinal reflex. B) In the nervous system, this expression implies the lack of brain input when executing a spinal reflex. C) This expression implies that the knee-jerk reaction will be shortened in duration following input from higher brain regions. D) This expression implies that only children exhibit this type of unthinking behavior.
How do auxin and cytokinin interact to affect the shape and growth of a plant?
What will be an ideal response?
The ________ is an extraembryonic membrane that surrounds the embryo and serves to protect and cushion the embryo
Fill in the blank(s) with correct word
Which of the following are environmental factors that determine where an organism can live? (Check all that apply.)
A) Intraspecific competition B) Predation C) Prey availability D) Soil type E) Sunlight F) Temperature G) Water