Which statement about ecosystems is false?
A) Energy cycles from organisms through the atmosphere and back to the organisms.
B) Carbon cycles from the atmosphere through organisms and back to the atmosphere.
C) Energy of sunlight is converted to energy stored in sugar molecules.
D) Most energy that enters the ecosystem leaves the system as heat.
Answer: A
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A salmon follows a scent trail upstream to find its way back to the stream where it hatched. What type of sensory receptor cell would it use?
A) thermoreceptors B) mechanoreceptors C) chemoreceptors D) electroreceptors E) nociceptors
Which of the following is true of transposable elements (TEs)?
a. Humans are one of a few organisms that do not contain TE DNA in their genomes. b. All TEs make a copy of themselves that inserts into a new location (copy and paste). c. All TEs are removed from one location before moving to another (cut and paste). d. TEs can be mutagenic. e. The site into which a TE inserts itself is homologous to the TE itself.
The most primitive of the current reptiles based upon
the time of divergence from the stem reptiles are the a. crocodiles. b. snakes. c. tuataras. d. lizards. e. turtles.
Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. Light, water, minerals, and dissolved gases surround the whole body of a submerged green alga, and the buoyancy of water provides physical support. What adaptation did plants have to make in taking up gasses without drying out when they moved to dry land?
a. Production of pollen b. Development of stomata c. Development of vascular tissue d. Production of a cuticle e. Production of lignin