Applying what you know about animal populations that would exhibit an S-shaped population curve, what are some life history characteristics you would expect to see in this species?
What will be an ideal response?
These animals are typically large themselves, have a small number of offspring but the offspring are often large, they develop slowly, and there is often parental care. They show the late-loss type of survivorship.
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Seeds appeared in the fossil record by
A. 100 million years ago. B. 365 million years ago. C. 545 million years ago. D. 780 million years ago. E. a billion years ago.
Why is it ineffective to treat viral disease with antibiotics?
a) Due to excessive antibiotic use, most viruses have evolved to be resistant to antibiotics. b) Antibiotics inhibit enzymes specific to bacteria and have no effect on virally encoded enzymes. c) Pathogenic RNA viruses have a high rate of mutation, producing new genetic varieties that are insensitive to antibiotic treatment.
Which of the following is not one of the distinctive features of dinoflagellates?
A. They are photosynthetic. B. Some exist in fresh water, while some are part of marine plankton. C. They form large, spherical colonies. D. They are unicellular. E. Some planktonic members are luminous and cause flashes in the night.
Which of the following genotypes would most likely lead to a low birth weight and a small placenta?
A) Igf2+/Igf2- but only in female progeny as the Igf2 gene is on the X-chromosome. B) Igf2+/Igf2+ where neither maternal nor paternal allele is mutated. C) Igf2+/Igf2- and it doesn't matter which parental source the mutated Igf2- comes from. D) Igf2+/Igf2- where the mutated Igf2- allele comes from the paternal source. E) Igf2+/Igf2- where the mutated Igf2- allele comes from the maternal source.