How could the Hershey and Chase experimental procedure be redesigned to support a hypothesis that RNA carries genetic information?
A. Extract RNA from Escherichia and mix it with the T2 bacteriophage
B. Replace T2 bacteriophage with an RNA virus
C. Replace Escherichia with an RNA virus
D. Use 35S to label an RNA virus and 32P to label a DNA virus
E. Use 35S and 32P to label the same components of an RNA virus and T2 bacteriophage, then add both viruses to Escherichia cells
Answer: B
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Monoploids are useful in plant breeding because
A) they can be used to select for plants with desirable recessive traits. B) they will not express any undesirable recessive traits. C) they are one step in the path to creating desirable polyploid plants. D) they are typically resistant to commercial herbicides.
In humans, which receptor is used primarily to detect light?
A. photoreceptor B. proprioceptor C. chemoreceptor D. mechanoreceptor E. electroreceptor
Which statement is true?
a. The anterior pituitary gland is essentially nervous tissue. b. The anterior pituitary gland secretes only two hormones. c. Only the posterior part of the pituitary gland could be called the "master gland." d. The posterior pituitary gland only stores hormones produced by the hypothalamus. e. The anterior pituitary gland is conencted to the hpothalamus via the infindibulum.
At the beginning of this century there was a general announcement regarding the sequencing of the human genome and the genomes of many other multicellular eukaryotes
Many people were surprised that the number of protein-coding sequences was much smaller than they had expected. Which of the following could account for much of the DNA that is not coding for proteins? A) DNA that consists of histone coding sequences B) DNA that is translated directly without being transcribed C) non-protein-coding DNA that is transcribed into several kinds of small RNAs with biological function D) non-protein-coding DNA that serves as binding sites for reverse transcriptase