What is the function of the nuclear pore complex found in eukaryotes?
A) It regulates the movement of proteins and RNAs into and out of the nucleus.
B) It synthesizes the proteins required to copy DNA and make mRNA.
C) It selectively transports molecules out of the nucleus, but prevents all inbound molecules from entering the nucleus.
D) It assembles ribosomes from raw materials that are synthesized in the nucleus.
A
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Water flowing back and forth across the gills of fish is known as _____
a. capillary movement b. counter current exchange c. deoxygenation d. pharyngeal movement e. gill slits
When the result of two hormones working together is greater than that of either working alone, we say that they work ________
Fill in the blank(s) with correct word
Coughing is initiated by ________ located in the ________
A) stretch receptor : trachea B) chemoreceptors : trachea C) irritant receptors : nose and pharynx D) irritant receptors : trachea E) chemoreceptors : nose and pharynx
The ? chain of adult hemoglobin is composed of 146 amino acids of a known sequence. In comparing the normal ? chain with the ? chain in sickle-cell hemoglobin, what alteration is one likely to find?
A) trinucleotide repeats B) glutamic acid replacing valine in the first position C) frameshift substitutions D) extensive amino acid substitutions E) valine instead of glutamic acid in the sixth position