What molecule begins DNA replication?

A. DNA polymerase

B. Helicase

C. RNA polymerase

D. mRNA

Which of the following is NOT an effect of histone acetylation? a. the positive charges on lysines are neuralized b. conversion of the beads on a string to the 30 nM fiber c. DNA binding to the nucleosomes is weakened d. recruitment of SWI/SNF e.

Would the cell theory change if new information was discovered about cells today? Why or why not?

Which choice best describes the end product meiosis? A. produces 2 identical daughter cells B. produces 4 identical daughter cells C. produces 2 genetically different daughter cells D. produces 4 genetically different daughter cells

Describe the potential effects when a keystone species is removed from a community.

A couple seek molecular testing for prenatal diagnosis of an autosomal recessive condition. the haplotype in coupling with the mutation is found in both parents by analysis of the parents and the affected child.

An adult male pig's urine contains a chemical substance that accelerates the onset of puberty in female pigs. What is this substance called?

Which of the following is a physiological adaptation?

Which measures the mass of an object?

Which line of defense includes active immunity? first second third fourth

Unwrapped food placed in a freezer experiences dehydra - tion, known as "freezer burn." why?