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A student wants to determine the density of a pine cone. He weighs the cone and prepares to find its volume. He submerges the pine cone in a graduated cylinder filled with water and records the water level. He realizes he forgot to record the initial water level of the graduated cylinder. Because he wants to get done with the lab, he removes the pine cone and records the water level. He uses this water level as the initial water level when he calculates density. Will his calculated density differ from the true density? If so, how and why?
Estimate the sequence of hexapeptide on the basis of the following data. When the sequence is not known, a comma separates the amino acids.
Draw a ball and stick figure representation of 10 molecules of phospholipids floating on the surface of salt water. Label the polar and nonpolar parts.
an electron of energy 400eV moves at right angles to a uniform magnetic field along an arc of radius 2.0cm. A second electron moves at right angles to the field along an arc of radius 3.2cm. What is the energy of the second electron?
Which of the following bodies of evidence caused scientists to completely overhaul their traditional views of animal phylogeny?
What does it mean to be an "multicellular organism"? The cellular slime mold Dictyostelium discoideum exists initially as a collection of separate cells moving over the forest floor.
he pyrimidine and purine bases are nitrogen containing compounds. What is the source of nitrogen for these two ring systems? In most examples,
The ability to taste PTC is due to a single dominant allele "T". You sampled 215 evolution students, and determined that 150 could detect the bitter taste of PTC and sixty-five could not.
A piece of DNA has unwound and the ends of the two strands have begun separating for replication.Describe in specific detail the discontinuous synthesis of the the lagging strand. Draw a simple diagram, with the 3' and 5' ends labeled, to show tha..
The ability of urea diffusing across membranes of red blood cells. I was told that urea can easily penetrate the membrane as they are not present in high concentration inside the cell.
On the morning of the 27th December 1996, Patsy Ramsey called the police to report her 5-year-old daughter, Jon Benet Ramsey, missing. The little girl had disappeared from her bedroom and a ransom note demanding one hundred and $8000.
Which of the following describes the secretory phase of the menstrual cycle?
Living organisms make and use three main types of ribonucleic acids for their biological functions: ribosomal RNA (rRNA) messenger RNA transfer RNA.
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