Mutualism is a relationship
A) that sometimes provides benefits for both members such that one or both parties cannot live without the other.
B) where only one member derives benefit from the other.
C) where one member of the relationship may kill the other.
D) where one member of the relationship benefits without hurting the other.
E) where it is difficult to prove the benefits or disadvantages one member of the relationship may provide for the other.
A
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In the past, species of sponges, cnidarians, and ctenophores were referred to as "lower" or "primitive" animals because of their relatively simple body plans and lack of any sophisticated organ differentiation
Which of the following suggest that the terms "lower" or "primitive" are not useful as descriptors for these organisms? A. Many members of these groups are active predators and feed on other organisms. B. These groups have been around for millions of years, so their evolutionary path has been successful in spite of limited complexity. C. These groups are not primary producers, so should not be classified as "lower" because they occur higher on the trophic pyramid. D. These groups harbor a lot of genetic variation; "lower" groups would have less evolved genomes.
Speciation occurs
a. after populations become reproductively isolated. b. when mutations generate observable differences. c. when transitional forms develop between different populations. d. when natural selection pressures reach their maximum. e. with all of these
The method of using RFLPs to identify bacterial or viral pathogens is called
A. proteomics. B. DNA fingerprinting. C. genetic screening. D. DNA sequencing.
A friend tells you that she wants to try to be a strict vegetarian or vegan, but her parents are discouraging her from doing so. Her parents say she will not get enough protein or vitamins. What advice can you offer your friend to help her convince her
parents she will get enough protein and vitamins on a vegetarian or vegan diet? What will be an ideal response?