Many diseases are the result of a problem with cell signaling. Which of the following diseases BEST exemplifies this fact?
a. a specific type of cancer, which is caused by a truncated receptor that becomes stuck in the activated form.
b. congestive heart failure, which is caused by chronic high blood pressure due to excessive sodium intake
c. familial hypercholesterolemia (high cholesterol in the blood), which is caused by a decrease in the number of receptors for cholesterol.
d. cystic fibrosis, which is caused by a mutation in a channel protein, resulting in a buildup of mucus
Ans: a. a specific type of cancer, which is caused by a truncated receptor that becomes stuck in the activated form.
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Eukaryotes are able to express different proteins over time or at certain points in the life cycle by using ________.
A. silencers B. riboswitches C. siRNAs D. mediators
Darwin's theory of evolution is supported by many modern pieces of evidence. Check all that apply.
_____ New measurements of the age of the earth. _____ An understanding of the mechanism of heredity. _____ Human population growth. _____ Comparative studies of animal structures. _____ Similarities in DNA of related species.
Given what you learned from the chapter on population growth in various regions of the world, in which of these growth stages shown in the graph below would you place the countries on the continent of Asia?
a. Stage 2
b. Stage 3
c. Stage 1
d. Stage 4
In comparing a frog cell in metaphase of mitosis with one in metaphase I of meiosis, how would tell you which was which?
A) In mitosis, the chromosomes would be unduplicated (single-stranded) and in meiosis, they would be double-stranded (made up of sister chromatids). B) In meiosis, the chromosomes would be unduplicated (single-stranded) and in mitosis, they would be double-stranded (made up of sister chromatids). C) Unlike meiosis, in mitosis each chromosome would be paired with its homolog. D) Unlike mitosis, in meiosis each chromosome would be opposite its homolog.