Which of the following features is NOT an advantage of an organism that has a viviparous life history?
A. The mother supplies the offspring with nourishment, even after birth.
B. Development of the offspring occurs inside of the female.
C. Offspring can live independently shortly after they are born.
D. The eggs are retained within the body of the mother until the offspring are able to fend for themselves.
E. The unborn offspring is supplied with a continuous flow of nutrients during development.
Answer: D
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Which trait is governed by the X chromosome?
a. Distribution of body fat b. Color perception c. Distribution of hair d. Blood clotting e. All of these choices.
DNA replication occurs during cytokinesis. Indicate whether the statement is true or false
Which statement is NOT true about DNA replication in prokaryotes?
A. Replication begins at a single origin of replication. B. Replication is bidirectional from the origin(s). C. Since bacterial cells replicate so rapidly, a second round of replication may begin before the first has been completed. D. Replication occurs at about 1 million base pairs per minute. E. There are many bacterial chromosomes, with replication occurring in each at the same time.
Polymerase chain reaction (PCR) is useful for amplifying a small piece of DNA but is not a good technique for cloning genes because
A) DNA ligase cannot be used in PCRs. B) PCRs do not generate palindromic sequences. C) copies of DNA produced by PCRs lack the regulatory genes and proteins required to activate genes. D) PCRs only generate primary transcripts that require excision of introns. E) ribosomes are required to produce active genes.