Which of the following describes a polysome?
a. the combination of a large and a small ribosome subunit
b. an mRNA with multiple ribosomes attached
c. the assembly at a promoter at the start of transcription
d. the complex where mRNA splicing occurs
Ans: b. an mRNA with multiple ribosomes attached
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Meeting the needs of the present generation without reducing the ability of future generations to meet their own needs is the goal of
a. sustainability b. ecology c. conservation biology d. sociology e. biology
Which of the following features are found within the lophotrochozoa?
A. Bilateral symmetry at some point in their life, three germ layers as embryos, are terrestrial, and are classified as protostomes. B. Radial symmetry at some point in their life, three germ layers as embryos, are aquatic, and are classified as protostomes. C. Bilateral symmetry at some point in their life, two germ layers as embryos, are aquatic, and are classified as protostomes. D. Bilateral symmetry at some point in their life, three germ layers as embryos, are aquatic, and are classified as deuterostomes. E. Bilateral symmetry at some point in their life, three germ layers as embryos, are aquatic, and are classified as protostomes.
In what order does the variance in male reproductive success increase with mating system? (left = lowest to right = highest)
a. Polyandry > Polygynandry > Monogamy > Polygyny b. Polyandry > Polygynandry > Polygyny > Monogamy c. Polyandry > Monogamy > Polygynandry > Polygyny d. Polygynandry > Polyandry > Monogamy > Polygyny
Please choose the answers that correctly describe the virulence factors of Staphylococcus aureus.
> Coagulase enzyme causes blood plasma to clot. > Staphylokinase enzyme destroys red blood cells. > Penicillinase enzyme allows S. aureus to grow in the presence of penicillin. > Hyaluronidase enzyme promotes invasion of host tissues. > Lipase enzyme causes a fever in the host.