The diatoms below are magnified 400x. To find the total magnification while looking under a microscope, you must multiply the power of the eyepiece lens by the power of the ? *

Answer:

ll living things are composed of cells. This is one of the tenets of the Cell Theory, a basic theory of biology. This remarkable fact was first discovered some 300 years ago and continues to be a source of wonder and research today. Cell biology is an extremely active area of study and helps us answer such fundamental questions as how organisms function. Through an understanding of how cells function we can discover how human ailments, such as cancer and AIDS, can be possibly treated.

THE CELL THEORY

All life is composed of cells

Cells are the fundamental units which possess all the characteristics of living things

New cells can only come into existence by the division of previously existing cells

Notice that this scientific concept about life is called a theory. In science, unlike the layman’s definition, the word theory is used for a hypothesis about which there is a large body of convincing evidence. Under experimental conditions all observations have thus far confirmed the theory. The evidence that helped formulate the theory was obtained using the microscope. The microscope is of enormous importance to biology and has extended our ability to see beyond the scope of the naked eye.

When we look at cells under the microscope, our usual measurements fail to work. In science, the metric system is used to measure objects and, as you will see, is vastly superior to our antiquated English system of measurement. Here are the basic units:

Length Volume Weight

1 meter (m) 1 liter (L) 1 gram (g)

1 millimeter (mm) = 0.001 m or 10−3 m or 1/1,000 m 1 milliliter (ml) = 0.001 L or 10−3 L 1 milligram (mg) = 0.001 g or 10−3 g

1 micrometer (mm)= 0.000001 m or 10−6 m or 1/1,000,000 m 1 microliter (ml) = 0.000001 L or 10−6 L 1 microgram (mg) = 0.000001 g or 10−6 g

1 nanometer (nm)= 0.000000001 m or 10−9 m or 1/1,000,000,000 m  

There is also a different scale for temperature: Celcius.

100˚ Celcius (C) = water boiling (equivalent to 212˚ F)

0˚ C = water freezing (equivalent to 32˚ F)

Converting between units can be confusing. The most effective way to do this is by using conversion factors and canceling units. For example, if you want to know how many liters are in 425 milliliters, you can set up a simple equation that looks like this.

[latex]\displaystyle{425}\text{ ml}\times\frac{1\text{ liter}}{1000\text{ ml}}=\frac{425\text{ ml}}{1000\text{ ml}}=0.425\text{ L}[/latex]

PRACTICE

1.2 mm = ________ mm 0.224 m = ________ mm 225 nm =___________mm

0.023 L = ________ ml 750 ml = _________L 50 ml       =___________ L

Part 1: Microscope Parts

Nikon microscope with parts labelled. The compound microscope is a precision instrument. Treat it with respect. When carrying it, always use two hands, one on the base and one on the neck.

The microscope consists of a stand (base + neck), on which is mounted the stage (for holding microscope slides) and lenses. The lens that you look through is the ocular (paired in binocular scopes); the lens that focuses on the specimen is the objective.

Your microscope has four objectives of varying magnifications (4x, 10x, 40x, and 100x) mounted on a revolving nosepiece. The 100x objective is a special oil immersion objective that needs to be used with oil—we won’t use the oil immersion objective for this course.

Positioning the specimen requires that you turn the mechanical stage controls, which operate the slide bracket on the surface of the stage. One control moves the specimen in the x-direction, and the other moves the specimen in the y-direction.

Focusing on the specimen is achieved by knobs that move the stage up and down, so that it is closer or farther from the objective. There are two knobs, an outer coarse focus and an inner fine focus.

The substage condenser directs light through the slide into the objective. An iris diaphragm on the substage condenser controls the amount of light reaching the objective, and also affects the contrast of the specimen.

Part 2: Magnification

The compound microscope has two sets of lenses; the ocular lens (or eye piece) which magnifies an object 10 times its normal size, and the objective lenses located on a revolving nosepiece. Rotate the nosepiece and notice how each objective lens clicks into place. Each objective lens has a different magnification of power written on it (such as 4, 10, 40, or 100). This number is the power of magnification for each of the objective lenses. For total magnification multiply the ocular power (10x) times the objective lens that is in place. For example, if you have a 10x ocular and a 10x objective, the total magnification is: 10x × 10x = 100x.

Food webs usually contain a wide variety of organisms. Which statement can be used to describe all
of the organisms in a food web?
A.They need a source of energy

B.They can make their own food.

C.They eat the remains of other organisms

D.They eat producers.

Fill in the Blank: Different wavelengths of light have different ______

An organism with 48 chromosomes in a skin cell undergoes meiosis, how many chromosomes are in each daughter cell? A. 6 B. 12 C. 24 D. 48

PLS PLS PLS help will give BRAINLIEST

I'LL GIVE BRAINLIEST IF YOU EXPLAIN THE ANSWER AND IF IT IS RIGHT:

THE TAKING OF AIR RICH IN OXYGEN INTO THE BODY IS CALLED _

Many factors limit the growth of populations in ecosystems. Human activity can cause changes in ecosystems and can affect the limiting factors that act on populations. Which of the following factors that can limit population growth has been most affected by humans?
A.size of natural habitats

B.drought and flooding

C.parasitism

D.predator-prey relationships

Basically you have to fill in the blanks. The first one is Minerals, I think.




The basic building blocks of soil, rocks, and metals are m__________. Products made from minerals include the metals used to make airplanes to zippers, salt for your food, and copper which covers the S__________ of L__________.

help me on these two! i’m in 6th grade D:

Which of the following describes air temperature and air pressure at higher altitudes?
A) Air temperature increase while air pressure decreases
B) Air temperature and air pressure both decrease
C) Air temperature and air pressure both increase
D) Air temperature decreases while air pressure increases

Need help ASAP! Will give brainliest to correct answer

Cell riddles
I will give thanks, 5 stars, and brainliest if you get them correct!

As air circulates around the Earth it is dragged to the right in the Northern Hemisphere and left in the Southern Hemisphere. This is due to the fiction created by the Earth's surface. This "dragging" of air is called _________

HELP PLEASE!!! How are cellular respiration and photosynthesis similar?

A) Both processes break down glucose.
B) Both processes create food for organisms.
C) Both processes produce waste.
D)Both processes take place in chloroplasts.

put them in order pleaseeeee

This is for a project at school
For those into the hobby of aquascaping what type of driftwood do you prefer?
A. Malaysian driftwood
B. Cholla wood
C. Mopani wood
D. Bogwood

punnet square worksheet!

help please.

The symbols IA, IB, and i represent blood types A, B, and O respectively, where I stands for dominant and i stands for recessive. Which Punnett square represents the cross between a woman with both A and B antigens and a man that has neither A nor B antigens?

Two species of birds try to eat from the same ear of corn in a field, this is an example of

a. predation
b. commensalism
c.competition
d. sybiosis

Which weather state is most likely to cause an increase in precipitation?
A) Winds blowing from the south
B) An air temperature of 15 °C
C) High humidity
D) High air pressure

How does the pacific ocean help explain the weather differences between San Francisco and Kansas city? If possible, discuss your answer.

What's an example of random mating?

Which statement below is true?
A) When the humidity is low, water droplets form on cold surfaces.
B) When wind speed is low, a windsock stays up in the wind and appears full.
D) When you go higher in the atmosphere, the air pressure gets lower.
C) When the air temperature is high, the air feels cold against your skin.

can someone help me plzz ill give brainliest

15. What processes can cause rock to break apart into sediment?

What are 3 characteristics of bacteria?

is C27H46O a compound, element, or atom???

A mutation is a change in (blank)

information abut traits is stored in the cell nuclues in a molecule called
a. dna
b. atp
c. cytoplasm
d. the nuclues

I am approximately 22 feet long, andam a part of your digestive system. I also help you absorb nutrients from the food you eat. What am I?

i need help i have been stuck on this for awhile qwq

PART A: Which of the following best describes the central idea of the text?

Group of answer choices

People like buying experiences and products, but they gain more joy from the experiences that purchase than the products.

People gain more joy from buying experiences than buying products, but scientists have no explanation for why this happens.

People gain just as much joy from buying temporary experiences as they do from buying lasting products.

People feel negatively about buying products and positively about buying experiences.