In a DNA strand, a 5′ phosphate is connected to

A researcher conducted crosses between two different strains of Drosophila. When true-breeding flies with singed bristles (s) and normal wings (L) were crossed to true-breeding flies with normal bristles (S) and vestigial wings (l), all F1 offspring had normal wings and normal bristles. The F1 offspring were crossed to flies with singed bristles and vestigial wings. Which F2 offspring is/are nonrecombinant? 

What would be the expected results for the Meselson and Stahl experiment after 3 generations? Note: Generation zero has all heavy DNA, and all subsequent generations use light nitrogen to make new DNA strands.

With regard to a maternal effect gene, a mother is Dd and a haploid oocyte produced by the mother is d.  Which gene products would be found in this oocyte?

Let’s suppose that a gene exhibits a maternal effect pattern of inheritance. Which of the following statements about this gene is true?

Which of the following is found in a eukaryotic chromosome but not in a bacterial chromosome?

Which of the following is not one of the four criteria that the genetic material must fulfill?

A person with trisomy-18 exhibits a collection of physical abnormalities that affect many organs including the brain. These physical abnormalities occur because

Chargaff’s studies of the base composition revealed that the amount of A equals T and the amount of G equals C. These results were important determining which structural aspect of DNA?

Which of the following is not one of the four criteria that the genetic material must fulfill to function?