Get college assignment help at uniessay writers Which of the following is an incorrect statement about the vertebrate eye? A) The vitreous humor regulates the amount of light entering the pupil. B) The transparent cornea is an extension of the sclera. C) The fovea is the center of the visual field and contains only cones. D) The ciliary muscle functions in accommodation. E) The retina lies just inside the choroid and contains the photoreceptor cells.
Tiktaalik appears to be an intermediate between what two major types of organisms? 2. What key feature of Tiktaalik suggests that this species was active and mobile on land at least part of the time? 3. How did Tiktaalik breathe? 4. This species was thought to occupy
The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. Why?
Children with I-cell disease (“I” for “Inclusion bodies”) synthesize perfectly good lysosomal enzymes, but secrete them outside the cell instead of sorting them to lysosomes. The mistake occurs because the cells lack GlcNAc-P-transferase, which is required to create the mannose-6-phosphate marker that is essential for proper delivery of hydrolytic enzymes into the lysosomes. In principle, I-cell disease could also be caused by deficiencies in two other proteins: the phosphoglycosidase that removes GlcNAc to expose mannose-6-phosphate, and the mannose 6-phosphate receptor itself. These three potential kinds of I-cell disease could be distinguished by the ability of various culture supernatants to correct defects in mutant cells. Imagine that you have cell lines from three hypothetical I-cell patients (A, B, and C) that give the results below: A. The supernatant from normal cells corrects the defects in B and C, but not the defect in A. B. Hurler’s disease is due to the failure to make one particular lysosomal enzyme. The supernatant from A corrects the defect in Hurler’s cells, but supernatants from B and C do not. C. If the supernatants from the mutant cells are first treated with the phosphoglycosidase that removes GlcNac, then the supernatants from A and C correct the defect in Hurler’s cells, but the supernatant from B does not. From these results, deduce the nature of the defect in each of the three mutant cell lines (A, B, C).
1. Derive a relationship between the atomic packing factor(ionic packing factor)for the NaCl-type ceramic crystal structure and the ionic radius ratio (rc/Ra)
For the mugwump, a tree-dwelling mammal, the male is XX and female is XY. However, sex-linked genes are found to have the same effect as in humans. For instance, a recessive X-linked allele c produces red-green color blindness. If a normal female mugwump mates with a phenotypically normal male whose mother was color blind, what is the probability that a son from that mating will be color blind? A daughter?
Which of the following layers was nearest the surface of the leaf
Homework Question #5: Thinking about how a single biochemical pathway could be involved in color production in the corn example above, as well as how dominant/recessive alleles interact, briefly describe the genotypic conditions that must be met in order to have a purple colored seed.
why do you think wheelchair-bound people with paralyzed lower limbs have thin, weak bones of the leg and thigh?
With the removal of the ovaries, a woman’s natural ________ level drops.
Get college assignment help at uniessay writers All of the following provide chemoreceptor input to the respiratory centers of the medulla oblongata except the A.medullary chemoreceptors B. carotid body C.olfactory epithelium D. aortic body E.All of the above
A ________ is a prominent ridge formed by differential erosion of tilted, alternating hard and soft strata.
If an animal needed to store energy for long-term use, but not be encumbered with the weight of extra tissue, which is the best molecule for storage?
Use the Dichotomous Key to determine the taxonomic category (phylum or class as shown on the key) for each animal (picture), and write these categories under the Classification Column on the table.
4. Employer A states the average number of days missed in a year by each staff member is 4.0. Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1, and 6. At the .05 level of significance, is there convincing evidence that the number of absences per employee has
anatomical terms in the correct order that traces the circulation of a red blood cell in the human body. Start with where the RBC goes after leaving the right atrium and going through the tricuspid valve.
an organism called plasmodial slime mold is one large cytoplasmic mass with many nuclei.Explain how such a “megacell” could form?
what is the largest organism staphylococcus epidermidis, bacillus subtilis and escherichia coli
slogan for cell membrane
What is the process of cellular respiration?
5) A MAMMAL USES ONLY 1-2% OF ITS ENERGY IN VENTILATION WHILE A FISH MUST SPEND ABOUT 15% OF ITS ENERGY TO MOVE WATER OVER ITS GILLS. EXPLAIN THIS HUGE DIFFERENCE IN THEIR EFFORTS TO COLLECT OXYGEN.
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