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Celery stalks that are immersed in fresh water for several hours become stiff. Similar stalks left in a 0.15 M salt solution become limp. From this, we can deduce that the fresh water ________.

In facilitated diffusion, what is the role of the transport protein?

Many organisms spend most of their life cycle in the diploid state. If meiosis produces haploid cells, how is the diploid number restored for these types of organisms?

The atoms of different phosphorus isotopes _____.

What is the source of the extra chromosome 21 in an individual with Down syndrome?

Use the following map of four genes on a chromosome to answer the question. Between which two genes would you expect the highest frequency of recombination? 

Which of the following occurrences describes how recombination between linked genes comes about?

What is an allele? 

Sometimes when I have my morning coffee, which I drink black with no cream or sugar, I notice a thin film floating on top of the coffee. Since I have learned biology, I now realize the nature of this substance and so I run to my friend screaming, “Look at this ________ in my coffee!”

The process by which white blood cells engulf bacteria is known as: