Thinking about the surface of cells, which of these cells has the largest problems due to surface area limitations?
A. A normal E. coli fecal cell in the digestive tract of animals may be 0.003 millimeters, in a rounded rod or cylinder shape.
B. An amoeba cell in a lake may be 0.50 millimeters, and variable in shape with many long, narrow extensions of the cell.
C. A human egg cell is often 0.13 millimeters, and is spherical in shape.
D. A normal Vibrio cholorea bacterium found in contaminated water may be 0.005 millimeters, in a long curved rod shape.
E. An epithelial cell lining any mammal arteries may be 0.03 millimeters, and has a very flat shape.
C. A human egg cell is often 0.13 millimeters, and is spherical in shape.
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Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against Mr. Johnson's jaw. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. Where was the hearing problem most likely to
be? A. auditory cortex of Mr. Johnson's brain B. auditory nerve leading to Mr. Johnson's brain C. hair cells in the cochlea D. tympanum or the bones of the middle ear E. fluid of the cochlea
When a ciliate reproduces asexually by mitosis
A. The macronucleus divides into two with each new cell receiving an identical macronucleus. B. The macronucleus divides into four micronuclei with each new cell receiving two micronuclei each. C. The macronucleus doesn't divide but it goes to one new cell and the micronuclei go to the other. D. The macronuclei fuse with the micronuclei and then divide into two with each new cell receiving an identical fused nucleus.
The genes that determine the development of limbs in lizards as opposed to snakes are called hox
genes.
Indicate whether the statement is true or false.After the guanine, what is the next nucleotide that will be added to this growing strand of RNA?
1.adenine
2.cytosine
3.guanine
4.uracil