How did Thomas Malthus influence Darwin's thinking?
a. Darwin was convinced artificial selection could work in nature.
b. Darwin realized species typically produce more offspring than needed to replace the parent generation.
c. Darwin realized that the fate of humanity was dependent on artificial selection.
d. Darwin believed the fate of humanity was dependent on natural selection.
e. Darwin was convinced to publish his ideas about natural selection
ANSWER: b
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A major biological paradox is that genes are generally highly conserved and yet
A. there is very little difference among life forms existing today. B. there is so much diversity among life forms existing today. C. there are a huge number of ancestral genomes no matter how far back we look. D. there are essentially identical development patterns in all species. E. there is very little research into genomic sequences.
Which of the following statements is false regarding
alcohol consumption during pregnancy? a. The developing embryo or fetus quickly absorbs alcohol across the placenta. b. Symptoms of fetal alcohol syndrome include reduced brain size and facial deformities. c. Cases of FAS are seriously underdiagnosed and misdiagnosed. d. The effects of FAS are temporary. e. Even occasional drinking may have negative effects.
In humans, the cranial border of the pelvis is _____ to the thigh.
Fill in the blank(s) with the appropriate word(s).
Plasmids are used as vectors in plant and bacterial genetic engineering. However, there is a major difference in the fate of genes introduced into bacteria on most bacterial plasmids and into plants on tumor-inducing (Ti) plasmids
What is this difference? A) In bacteria, genes are stably expressed; in plants, gene expression is always lost quickly. B) Gene expression tends to decrease rapidly and unpredictably in bacteria; gene expression is much more stable in plants. C) Bacterial plasmids are circular DNAs; Ti plasmid DNA is linear. D) Bacterial plasmids and the genes they carry usually are not integrated into the chromosome; Ti plasmids and the genes they carry are integrated into the chromosome.