Ok..the first homework! Remember to do it by Friday...On this one we'll practice so it should be done.
What to do? Select and copy the homework. Paste it into Word and indicate to me the correct answer. Once done email it to me. In the subject part of email put your name and class period.
1. Of the following, which instrument is most commonly used to observe the external features of a grasshopper's abdomen?
1. ultracentrifuge
2. microdissection instrument
3. dissecting microscope
4. electron microscope
2. To study the structure of phloem and xylem tissue, a student could prepare and observe sections using a(n)
1. microscope
2. centrifuge
3. incubator
4. triple beam balance
3. A student observed a Paramecium under the low power objective of a microscope (100x) and then under high power (400x). The image of the Paramecium under low power, compared to the image of the same Paramecium under high power, would be
1. smaller and in a darker field of view
2. smaller and in a brighter field of view
There was some confusion in class over this, most likely caused by me not having my cup of coffee. Though we will see most likely all of the paramecium under lower power the image will be smaller. This allows more light to flow through the lenses, thus it will be brighter.
3. larger and in a darker field of view
4. larger and in a brighter field of view
4. The width of a human hair is 0.1 millimeter. The width of this human hair in microns is
1. 1 u
2. 10 u
3. 100 u ...recall that there are 1000 microns (also called micrometers) in one millimeter...talking real small here
4. 1000 u
5. Which statement describes the best procedure to determine if a vacccine for a disease in a certain bird species is effective?
1. Vaccinate 100 birds and expose all 100 to the disease
2. Vaccinate 100 birds and expose only 50 of them to the disease.
3. Vaccinate 50 birds, do not vaccinate 50 other birds, and expose all 100 to the disease
Note: the 50 not vaccinated are called the control
4. Vaccinate 50 birds, do not vaccinate 50 other birds, and expose only the vaccinated birds to the disease.
|
|
