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3 years ago

Where are objective and ocular lenses found on a microscope

1 answer:

3 0

Microscope slide holder. When you observe samples under a light microscope, they will usually be mounted on a glass slide. The slide holder is used to secure your slide in place so you will not inadvertently change its position.The paired knobs below the stage on the right-hand side move the slide holder either forward and back or left and right. These allow you to precisely control the position of the sample on the stageThe scales on the slide holder can be used to determine the position of an object on the slide. Thus, you can find an object, note its location, move to a new position and then later return to the mapped object. The condenser. Below the stage is the condenser which is used to focus light on the sample. On the left side of the condenser is a knob that can be used to move the condenser up or down. In the up position, intense light is focused on the sample while in a lower position the light is less intense and more diffuse. As a general guide, you will usually want the condenser relatively high for looking at stained samples while a lower position may be preferable for increasing the contrast of unstained materials. The condenser also has an iris diaphragm which can be open or closed to control the light on the sample. The diaphragm opening is altered by moving the lever located at the front of the condenser.

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Assuming the population begins in H−W equilibrium, what is C1 allele frequency after one generation of natural selection? Expres

DIA [1.3K]

Complete question:

In a population of flowers growing in a meadow, C1 and C2 are autosomal codominant alleles that control flower color. The alleles are polymorphic in the population, with f (C1) = 0.7 and f (C2) = 0.3. Flowers that are C1C1 are yellow, orange flowers are C1C2, and C2C2 flowers are red. A storm blows a new species of hungry insects into the meadow, and they begin to eat yellow and orange flowers but not red flowers. The predation exerts strong natural selection on the flower population, resulting in relative fitness values of C1C1 = 0.30, C1C2 = 0.60, and C2C2 = 1.0. Assuming the population begins in H−W equilibrium, what is C1 allele frequency after one generation of natural selection? Express your answer using three decimal places.

Answer:

The C1 allele frequency after one generation of natural selection equals 0.559

Explanation:

Due to technical problems, you will find the complete answer and explanation in the attached file.

Download pdf

4 0

3 years ago

The bacterium E. coli is capable of performing aerobic respiration, anaerobic respiration, and fermentation. When would it perfo

Eduardwww [97]

Answer:

1. Aerobic respiration: when oxygen is present.

ATP is made by respiratory linked phosphorylation.

2. Anaerobic respiration: when oxygen is absent. For example, in the gut of mammals.

ATP is made by substrate-level phosphorylation.

3. Fermentation: this is the last resort or least preferred process after aerobic and anaerobic respiration, respectively. This is achieved in conditions of oxygen absence (anaerobic conditions) and when energy (ATP) is not required in high levels.

ATP is made by substrate-level phosphorylation.

Explanation:

Escherichia coli is a Gram-negative species of versatile bacterium that is not only able to grow when oxygen is present (aerobic conditions), but it can also adapt to different conditions and grow in the absence of oxygen using either anaerobic respiration or fermentation. This is a great adaptation because it allows it to grow in a wide variety of environments.

1. Aerobic respiration: when oxygen is present. It is the most preferred mechanism to produce ATP as conditions are optimal.

ATP is made by respiratory linked phosphorylation.

*Metabolism releases energy and is captured by the phosphate bonds of ATP.

2. Anaerobic respiration: when oxygen is absent. For example, in the gut of mammals. The second preferred mechanism to produce energy because it does not produce as much energy as aerobic respiration does.

ATP is generated by substrate phosphorylation.

*Phosphate groups are directly transferred during the conversion of ADP into ATP.

3. Fermentation: this is the last resort or least preferred process after aerobic and anaerobic respiration, respectively, because it produces even less ATP. This is achieved in conditions of oxygen absence (anaerobic conditions) and when energy (ATP) is not required in high levels.

ATP is made by substrate-level phosphorylation.

*Phosphate groups are directly transferred during the conversion of ADP into ATP.

3 0

4 years ago

What is 10 and 11 please

MAVERICK [17]

Answer:

I believe number 10 would be B and number 11 would be D.

Explanation:

Energy travels from the sun to the producer which is like a plant of some sort. Then, the energy from the plant goes to the primary consumer which is the first set of consumers, in this example, it will be the minnow. Other consumers include secondary consumers, in this case the frog, quaternary consumers, like a snake that would eat the frog, and tertiary consumers, like an eagle that would eat the snake. Energy is passed to each organism from the organism before it in the food chain.

4 0

3 years ago

Nhich of the following statements is NOT true?

Neko [114]

Answer:

Explanation:

5 0

3 years ago

Though it is possible that REM sleep and dreaming are not necessary in the adult, REM deprivation studies seem to suggest otherw

HACTEHA [7]

Answer:

Rapid eye movement sleep (REM) may be defined as the the phase of the sleep that are unique to the mammals. This sleep is marked by the muscle tone.

The REM leads to the increase in pressure with deprivation. This leads to the increase in the rapid eye movement and plays an important role in the REM sleep and dreaming of the individual and quite necessary in the adult.

7 0

4 years ago