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4 years ago

Which of the following is true regarding the cell theory choose all that apply?

Biology

2 answers:

emmasim [6.3K]4 years ago

6 0

Answer:

The correct answers are option C and D.

Explanation:

The three basic sayings of the cell theory are that all the living components are formed of cells, the cells are the basic unit of all living species, and all the cells originate from the preexisting cells. All the living things, that is, from microscopic species to the largest one like whale, are all formed of cells. These cells can differ broadly, however, all the living components are formed of cells.

The cells in a living being cannot be further dissociated into any more level. Like the atoms and matter, the cells and living species are associated, that is, at their most basic level, the living species are formed of cells.

Arada [10]4 years ago

4 0

C. cells . are the basic units of life

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4 years ago

Which ecosystem is more healthy, tundra, grassland, or desert? why?

Kamila [148]

Answer:

Grassland

Explanation:

Healthy grasslands are important habitats for birds and other wildlife, and also places where we farm and ranch. They provide food, cover, space and safe access to water for both wildlife and livestock.

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3 years ago

After performing a gram stain of a mixed culture of gram positive and gram negative cells, you shout: "oops, i forgot the iodine

zalisa [80]

Gram's staining is a differential staining technique that employs a primary stain like crystal violet and a counter stain like safranin along with the decolourizing agent alcohol and a mordant called the Gram's iodine.

Iodine is a mordant added after the primary stain. It fixes the stain by combining with it to enchance the staining ability. This forms an insoluble crystal violet iodine complex appearing purple under the microscope. These microorganisms are classified as Gram positive.

If addition of iodine is skipped, crystal violet is not fixed on the slide and the insoluble complex is not formed. The cells are decolourized by alcohol and are stained by the counter stain safranin making the Gram positive cells wrongly indentified as Gram negative due to its pink colouration. Thus, the slide will show all the cells as pink coloured Gram negative cells.

3 0

3 years ago

Captive breeding: a) has allowed for the reintroduction of many species to areas from which they had disappeared.b) does not req

Snezhnost [94]

Answer:

Option-D

Explanation:

Captive breeding or breeding in the captivity is the conservation technique employed by the government to conserve nature.

Captivity breeding is also known as the captive propagation of animals in which animals are kept either in their natural habitat (ex-situ conservation) or in artificial conditions like in zoos where condition similar to the habitat of animal are created.

The breeding programme aims at conserving the natural habitat of the animals to prevent the endangered species from extinction. The endangered species are at risk of extinction due to loss of fragmentation, pollution, predation and others.

Thus, Option-d is the correct answer.

4 0

3 years ago

A student wants to know what effect temperature will have on the germination rate of radish seeds.  To test this, she obtains 3

kondaur [170]

Answer:

Hypothesis: IF the temperature is high, THEN the germination rate of radish seeds will increase.

Experimental Group: 20 Seeds in petri-dishes placed in the freezer and incubator each

Control Group: 20 seeds stored at room temperature

Manipulated Variable (IV): TEMPERATURE

Responding Variable (DV): GERMINATION RATE

Constants: Amount of water, same amount of time (2 weeks)

Explanation:

- The hypothesis is a testable explanation given to an observed problem. A possible hypothesis is IF the temperature is high, THEN the germination rate of radish seeds will increase.

- Independent or manipulated variable is the variable that is changed or manipulated variable in an experiment. The TEMPERATURE is the independent variable in this case.

- Dependent or responding variable is the variable that is measured in an experiment. In this case, the dependent variable is the GERMINATION RATE

- The experimental group is the group that receives the experimental treatment. In this case, the experimental group is the 20 Seeds in petri-dishes placed in the freezer and incubator each.

- The control group is the group that does not receive the experimental group. In this case, the control group is the 20 seeds stored or placed at room temperature.

- Constants are the variables that are kept unchanged throughout the experiment. In this case, the constants are Amount of water, same amount of time (2 weeks)

8 0

4 years ago