Which of the following statements is false?
a. About 300 species of turtles currently exist.
b. Turtles do not have teeth.
c. Turtle shells are enlarged in marine forms.
d. Turtles must return to land to lay eggs.
e. Most sea turtle species are highly endangered.
Answer: c
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Why are food chains relatively short?
A) Top-level feeders tend to be more numerous than lower-trophic-level species. B) Top-level feeders tend to be small but are capable of conserving more energy. C) Longer chains are less stable and energy transfer between trophic levels is inefficient. D) There are only so many organisms that are adapted to feed on other types of organisms. E) Food chain length is ultimately determined by the photosynthetic efficiency of producers.
A modification that occurs to a nuclear gene that alters gene expression without modifying the DNA sequence is called _______ inheritance
A. extranuclear B. cytoplasmic C. maternal effect D. epigenetic E. nuclear
A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections. Which explanation most accurately describes the mechanism of action behind this treatment?
A. Viruses can infect bacteria, transferring pathogenic genes. The viral genes can then be suppressed, causing the bacteria to not replicate viruses. B. The attachment structures on the virus and the receptors on the host cells make for exquisite specificity of viruses for particular bacterial species. C. Antibiotic resistance in humans is on the increase, so using a different kind of therapy is more beneficial. D. A wide variety of bacteria cause a large percentage of human infections, producing much sickness and death.
Which of the following can result in speciation
within a few generations? a. development of a physical barrier b. polyploidy arising in a plant species c. postzygotic isolating mechanisms d. change in environmental conditions e. the introduction of a new predator into an area