A geneticist has discovered a yeast cell, which encodes a DNA polymerase that may add nucleotides in both the 5’ to 3’ and 3’ to 5’ directions. Which of the following structures would this cell not likely generate during DNA replication?

DNA replication occurs through a complex series of steps involving several enzymes. Which of the following represents the correct order beginning with the earliest activity of enzymes involved in DNA replication?

If a messenger RNA codon is UAC, which of the following would be the complementary anticodon triplet in the transfer RNA?

During post-translational modification, the polypeptide from a eukaryotic cell typically undergoes substantial alteration that results in

Which of the following represents the maximum number of amino acids that could be incorporated into a polypeptide encoded by 21 nucleotides of messenger RNA?

A researcher uses molecular biology techniques to insert a human lysosomal membrane protein into bacterial cells to produce large quantities of this protein for later study. However, only small quantities of this protein result in these cells. What is a possible explanation for this result?

BamHI is a restriction enzyme derived from Bacillus amyloliquefaciens that recognizes short palindromic sequences in DNA. When the enzyme recognizes these sequences, it cleaves the DNA. What purpose would restriction enzymes have in a bacterium like Bacillus?

Viruses and bacteria have which of the following in common?

Griffith was a researcher that coined the term “transformation” when he noticed that incubating nonpathogenic bacteria with heat-killed pathogenic bacteria produced bacteria that ultimately became pathogenic, or deadly, in mice. What caused the transformation in his experiment?

Meselson and Stahl performed an elegant experiment using bacteria grown in heavy nitrogen (¹⁵ N) to show that DNA replication is semi-conservative. After growing the bacteria in heavy nitrogen, they switched the cultures to¹⁴ N for two rounds of replication. They then examined the cells by density centrifugation, separating the components by density. What is a likely result?

All of the following are mechanisms by which bacteria acquire genetic diversity except

DNA analysis of adult and developing frogs reveals that the same genes are present in all the cells of the frog throughout its development. However, certain proteins found in developing frogs are absent from adult frogs. Which of the following best explains this observation?

All of the following are true regarding gene expression except

A nucleus was removed from a fibroblast cell of an adult mouse (mouse 1). The nucleus was then inserted into an egg cell from which the nucleus was removed (the egg was from a different mouse, 2). The resulting diploid cell began to divide, and the young embryo was implanted into the uterus of a third mouse and allowed to develop. The third mouse eventually gave birth to a healthy mouse (mouse 4).

Which of the following correctly identifies the procedures described above?

A nucleus was removed from a fibroblast cell of an adult mouse (mouse 1). The nucleus was then inserted into an egg cell from which the nucleus was removed (the egg was from a different mouse, 2). The resulting diploid cell began to divide, and the young embryo was implanted into the uterus of a third mouse and allowed to develop. The third mouse eventually gave birth to a healthy mouse (mouse 4).

The phenotype of the young mouse (number 4) is expected to be

A yeast cell can be used to express an animal gene. Which of the following best explains why this is possible?

Which of the following statements is true concerning genes?