Why are cells generally small?
What will be an ideal response?
Cells need sufficient surface area for the exchange of nutrients and wastes with the external environment.
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If multiple fragments from a genome have been cloned into bacteria, how can a researcher identify the
bacteria that contains the particular sequence they are interested in?
a. The bacteria containing the gene of interest are antibiotic resistant and unable to digest Xgal. b. The DNA purified from individual colonies of bacteria is probed with a short, single stranded DNA fragment that is complementary to the gene of interest. c. The scientists have to sequence all of the DNA from all of the white bacterial colonies; fortunately computers let us automate this process. d. The scientists have to sequence all of the DNA from all of the blue bacterial colonies; fortunately computers let us automate this process. e. We have to isolate the DNA of interest before transforming it into the bacteria. That is the only way to know which bacteria have the DNA of interest.
In the human digestive system, the stomach produces about 2 liters of HCl and other gastric secretions every day. The acid secretion of the stomach
A. promotes a high pH. B. is stimulated by gastrin. C. begins the process of starch digestion. D. stimulates the gallbladder to contract. E. inhibits pepsin activity.
The Hershey and Chase experiments, in which radioactive phosphorus (32P) and radioactive sulfur (35S) were used,
demonstrated that ____.
a. DNA labeled with 35S and proteins labeled with 32P can be traced over the course of an experiment b. DNA labeled with 32P is transferred from the bacteriophage to the virus c. proteins labeled with 35S become deactivated and unable to be transferred d. bacteriophages transfer their DNA, not their coat proteins, into their hosts e. DNA may be the hereditary material, although bacteriophages transfer both DNA and proteins into their hosts
The phylogenetic analysis of nucleotide sequences for a group of retroviruses has allowed researchers to discover that
there are _____ major types of HIV that originate from one ancestral lentivirus. a. one b. two c. four d. ten e. fourteen