Which of the following is a nematode worm that has been used as a model organism in genetics?
A) Drosophila melanogaster
B) Mus musculus
C) Arabidopsis thaliana
D) Caenorhabditis elegans
E) Homo sapiens
D
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B cells differentiate in the ____, while T cells mature in the ____
a. bone marrow; thymus b. thymus; bone marrow c. bone marrow; bone marrow
d. bone marrow; blood e. blood; thymus
Sponges are believed to have arisen from the choanoflagellates because they possess:a
amebocytes. b. collar cells. c. spongin. d. spicules. e. oscula.
Which of the following is true about extinction?
a) Commercial hunting and fishing are careful not to deplete animal reserves. b) There are many causes of extinctions and an animal or plant may go extinct for any of a combination of these factors. c) Overexploitation by hunting and fishing is the foremost threat to tropical animals and plants. d) Introduction of new alien species helps preserve biodiversity and slow extinction. e) Without human activity, all species would survive and there would be no extinctions.
Sometimes domesticated plants and animals are released into the wild, where they breed, survive, and populate. Which of the following statements is true?
A. Because populations are heavily monitored by humans for disease there are few deleterious alleles found in most domesticated populations. B. They tend to perform very well as often the traits chosen for by humans have created bigger, stronger, and healthier populations that outcompete wild ones. C. There appears to be little difference between long-term survival of domesticated and wild species when both are left in the wild. D. Because domestic populations often come from a few individuals, deleterious alleles are allowed to drift to a high frequency which inhibits their ability to survive in the wild.