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Which of these statements is true of earthworms? A) They lack an excretory system. B) They have a body cavity. C) They have a bony endoskeleton. D) Their digestive system consists of a gastrovascular cavity. E) Their body plan consists of two tissue layers.
Destiny is a geneticist who studied the aging process, particularly the chromosome caps which failed to allow new cell division as cells aged. How would she classify the structures that she studies?
A reactio mixture containing 20 mM O-acetly serine, fifty mM NaCl, 50 mM HEPES buffer (pH 7.6), and O-acetyl serine is incubated at 37 C until the O-acetyl serine is completely hydrolyzed.
Suppose you are given a mixture of proteins that you examine by standard 2-D electrophoresis, with the following results for isoelectric points.
The difference between fetal and adult hemoglobin with regard to oxygen binding occurs because fetal hemoglobin has an amino acid substitution in one of its chains that results in a histidine being replaced by a serine.
The Na+ -K+ ATPase is also known as the Na+-K+ pump. It is responsible for maintaining the high extracellular sodium ion concentration and the high intracellular potassium ion concentration. What happens immediately after the pump hydrolyses ATP?
The fruit in summer squash may have different shapes. When two true breeding plants with disc-shaped fruit were crossed to true breeding plants with long fruit, all the F1 plants had disc fruits. In the F2 progeny there were 110 plants with disc-s..
Which phyla lack organs? What kind of the symmetry do they have? State all of the phyla which show cephalization?
What experiment would you design to determine the concentration of detergent that you could safely spread on the radish field that would reduce the germination rate of the seeds by only 10% compared with non-contaminated water?
Assume you ingest 20 cells of Salmonella typhimurium in a chicken taco. Some of the bacteria are killed as they pass through the stomach but ten viable cells survive and reach the intestine.
A population is composed of equal numbers of the genotypes AA, Aa, aa. The offspring produced by these genotypes number 756, 699, and 420, respectively.
At a beuty salon one might request a "permanent" to alter the shape of ones hair which is chiefly composed of fibrous proteins known as keratins. to increase the waves or curls in one's hair, the beatician treats your hair with a reducing agent ( ..
The most common primary malignant tumor of bones is called.
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