The protein ____________________ binds calcium during muscle contractions Fill in the blank(s) with the appropriate word(s)
ANSWER: troponin
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Whether a mutation is ultimately considered harmful,
neutral, or lethal is often determined by a. phenotype. b. the will of the individual. c. the Hardy-Weinberg formula. d. environment. e. fate.
A chlorine atom has 17 protons and 18 neutrons. What is its atomic mass?
a. 1 amu b. 17 amu c. 18 amu d. 35 amu e. 306 amu
Scientists can determine the size of DNA fragments through a process known as gel electrophoresis. In this process, DNA is loaded into a gel submerged in a liquid buffer through which an electric current is run. Large DNA molecules move slower and can be observed at the top of the gel, whereas smaller DNA fragments move faster (and are seen at the bottom of the gel). Based on what you know about the properties of DNA, how is the electric current arranged in this process?
a. Since DNA is negatively charged, the positive end is placed at the top of the gel, and the negative end is placed at the bottom of the gel. b. Since DNA is negatively charged, the negative end is placed at the top of the gel, and the positive end is placed at the bottom of the gel. c. Since DNA is positively charged, the negative end is placed at the top of the gel, and the positive end is placed at the bottom of the gel. d. Since DNA is positively charged, the positive end is placed at the top of the gel, and the negative end is placed at the bottom of the gel. e. Since DNA is uncharged, the placement of the positive end and negative end does not matter.
What type of bonding exists between the slight positive charge of a hydrogen atom and the slight negative charge of a nearby oxygen atom?
What will be an ideal response?