At some time during their lives, all cells must contain DNA.

Conjugation is the direct transfer of dna from one bacterium to another. occurs when a phage transfers bacterial dna from one bacterium to another. requires dna polymerase. is the result of crossing over.

Which of these events explains the presence of the volcano?

Why does the percentage of water increase as it moves through the mouth, stomach and the beginning of small intestine

Describe three observations an astronaut might make while viewing Russia at night. (Site 1)

Why could a choke hold (a tight grip around the neck) cause a person to pass out? what arteries would be involved?

The genes on a chromosome were represented as abcdefgh. after chromosomal breakage the order was found to be abcefgh. which type of change has occurred in chromosomal structure

The failure of homologous chromosomes to separate during meiosis is called a. skin disorders b. translocation. c. nondisjunction. d. Down syndrome.

As the wavelength increases, the frequency (A) decreases and energy decreases. (B) increases and energy increases. (C) decreases and energy increases. (D) increases and energy decreases.

The most obvious source of gene flow into any population is A) Emigration B) Immigration

Polypeptides and proteins must fold properly to be functional. Hydrogen bonds between the oxygen and nitrogen atoms of the peptide bonds are crucial to which level of protein structure?1. primary structure2. tertiary structure3. secondary structure4.