Humans follow which type of survivorship curve?
a. Type I
b. Type II
c. Type III
d. Type IV
a. Type I
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An alteration occurs during the formation of a dikaryotic cell, such that it has twice the number of nuclei compared to a normal dikaryotic cell. Only the number of nuclei changes; the type of nuclei remains the same. This altered cell is most accurately described as having
A. two haploid nuclei. B. two diploid nuclei. C. four diploid nuclei D. has four haploid nuclei. E. two haploid nuclei and two diploid nuclei.
Why is the protein-first hypothesis not accepted by most scientists?
a. Proteins cannot be catalysts. b. There is no known mechanism of protein self-replication. c. Of all of the macromolecules, only DNA can self-replicate. d. There is no evidence that proteins can store information. e. Proteins are too complex to have been the first "polymers of life."
Why is it beneficial to plants that soil particles have negatively-charged surfaces?
A. Negatively-charged ions are pushed towards the roots. B. Toxic metals are trapped and kept away from the plants. C. It helps maintain the water potential of the soil. D. They capture negatively-charged ions. E. They attract positively-charged ions and prevent them from being washed deep into the soil.
Epigenetic inheritance
A. only effects male offspring. B. only refers to autosomal genes. C. can result in the expression of different alleles in different generations. D. only effects female offspring. E. only refers to X inactivation.