Why are lichens generally absent in cities?
A. They are sensitive to pollution.
B. They need more light.
C. They are sensitive to the high noise levels.
D. They are aquatic organisms.
E. They need other plants around them.
Answer: A
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Which one of the following explains why rRNAs are the most abundant type of RNA in a mammalian cell?
A. There are more different types of rRNA genes than all other types of genes combined. B. There are rRNAs in ribosomes, and it takes millions of ribosomes to translate all the proteins required for a cell's functions. C. A different type of ribosome is needed to synthesize all of a cell's proteins, and because most proteins are present in multiple copies, a huge number of ribosomes are needed. D. It takes several rRNAs to transcribe a single mRNA, so there are many more rRNAs needed in a cell than the number of proteins synthesized. E. None of the above; rRNAs are not the most abundant type of RNA in a mammalian cell.
Ovulation is triggered by surge of which of the following hormones?
A. luteinizing hormone B. follicle stimulating hormone C. estrogen D. testosterone E. progesterone
Summarize the arguments both for and against irradiating foods
What will be an ideal response?
Despite tensions between Taiwan and China, Taiwan is one of the world's biggest investors in China
Indicate whether this statement is true or false.