As a young child, you preferred to collect shells and insects, dig through the mud around a pond, and watch birds
rather than play video games. What did you have in common with Charles Darwin?
a. an interest in history
b. an interest in evolution
c. an interest in natural history
d. an interest in geology
e. an interest in biogeography
ANSWER: c
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____ are molecules that regulate defense responses via signal transduction pathways
a. Complement b. Histamines c. Prostaglandins d. Cytokines e. Opsonins
Which of the following is true about the
metabolism of trans fatty acids?
a. we have evolved the enzymes to hydrolyze trans fatty acids b. we have enzymes to hydrolze cis fatty acids but not trans fatty acids c. we can metabolize about half of the trans fatty acids we consume but no more than that d. we cannot metabolize either cis or trans fatty acids e. more than one of these is correct
If an X-linked disorder is lethal to the affected individual prior to the age at which one reaches reproductive maturation, the lethality will be expressed only in males. Why is this so?
A) This is not true. We will see the lethality in females as well. B) As it's a lethal allele, it will kill the homozygous recessive first. These are the males. C) The only sources of the lethal allele in the population are heterozygous females who are "carriers" and do not express the disorder. D) At the cellular level, the protein will work less well in the male's cells. E) Because it's sex-limited inheritance, females do not demonstrate the phenotype.
Why have more groups within the archaeplastids not developed complex multicellularity?
What will be an ideal response?