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4 years ago

Bacteria cells have no ..

Biology

2 answers:

Gennadij [26K]4 years ago

4 0

Bacteria cells have no nuclei.

hope this helps :)

jarptica [38.1K]4 years ago

3 0

Bacteria cells have no nuclei. They do have something similar to a nucleus with is called a nucleoid which kind of like a simpler version of a nucleus. It still contains DNA but has less complicated parts to it than a nucleus does. Nucleoids are also spread out through the cell versus a nucleus which is more contained in the cell. Bacteria is prokaryotic which means that they do not have a nucleus or other specialized organelles. They have a cell membrane which basically keeps everything in, kind of like our skin. They can definitely reproduce, thats why we get sick and have to take antibiotics that help to stop their reproduction. And they have 'means of locomotion' which basically means that they can move around. They move through their pili and flagella.

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How do scientist measure objects in space

Korvikt [17]

Hello,

Here is your answer:

The proper answer to this question is "from its gravitational effects on other bodies in the solar system".

Here is how:

For example: If the planet has a moon scientist use a thing called which "can be relatively straightforward" which also determines the mass and height.

Your answer is from its gravitational effects on other bodies in the solar system!

If you need anymore help feel free to ask me!

Hope this helps!

7 0

3 years ago

What is genetic biodiversity?

Nady [450]

Answer:

So it would be the first one, The variation in biological factors affecting a species.

Explanation:

Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species, it ranges widely from the number of species to differences within species and can be attributed to the span of survival for a species.

All forms of life on earth, whether microbes, plants, animals, or human beings, contain genes. Genetic diversity is the sum of genetic information contained in the genes of individual plants, animals, and micro-organisms. Each species is the storehouse of an immense amount of genetic information in the form of traits, characteristics, etc. The number of genes ranges from about 1000 in bacteria to more than 400 000 in many flowering plants. Each species consists of many organisms and virtually no two members of the same species are genetically identical.

An important conservation consequence of this is that even if an endangered species is saved from extinction it has probably lost some of its internal diversity. Consequently, when populations expand again, they become more genetically uniform than their ancestors. There are mathematical formulas to express a genetically effective population size that explain the genetic effects on populations that have gone through a bottleneck before expanding again such as the African cheetah or the North American bison. Subsequent inbreeding in small populations may result in:

a) reduced fertility and

b) increased susceptibility to disease.

Genetic differentiation within species occurs as a result of sexual reproduction, in which genetic differences between individuals are combined in their offspring to produce new combinations of genes or from mutations causing changes in the DNA. Genetic diversity is usually mentioned with reference to agriculture and maintaining food security. This is because genetic erosion of several crops has already occurred leading to the world's dependence for food on just a few species. Currently, a mere 100-odd species account for 90% of the supply of food crops, and three crops – rice, maize, and wheat – account for 69% of the calories and 56% of the proteins that people derive from plants.

Have a good day <3

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3 years ago

Kelsy contracted an infection caused by a pathogen from the genus Trichophyton. Her doctor gave her a medicated cream to rub on

Gennadij [26K]

athlete’s foot, an itchy foot rash caused by a fungus

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3 years ago

Read 2 more answers

masteringbio JFor each of the studies described below, indicate if it is hypothesis driven and whether the scientist is employin

juin [17]

Incomplete question. The remaining part of the question read;

Words in the left column:

Yes
No
Observational
Manipulative

1. A physiologist incubates eggs in the lab at a range of temperatures to see what temperatures produce males and what temperatures produce females.

2. A biologist predicts that shade might influence ground temperature, and therefore turtle sex ratios. He records the sex ratio of turtle hatchlings in shaded and unshaded regions

3. An ecologist predicts turtles grow larger when no predators are around. She places turtles in an experimental pond system where half the ponds have predators and half the ponds have had the predators removed.

4. A climatologist predicts that concentration of CO2 in a city will be negatively correlated with the amount of wind in that city. He collects data and looks at the amount of CO2 in a city as a function of the wind speed in the city.

5. A sociologist conducts a survey in Hawaii to describe people's attitudes about global climate change.

6. A scientist determines the average wind speed, and variation in the amount of wind, in a number of locations to see which locations would be most suitable for wind turbines

Answer/Explanation:

1. Hypothesis-driven? Yes!

Observational or Manipulative? Observational.

We can make this conclusion here that the physiologists' research is hypothesis-driven since we are told he wanted to "see what temperatures produce males and what temperatures produce females." In other words, he wanted to know whether the temperature used in incubators can influence the sex of an egg by means of observation.

2. Hypothesis-driven? Yes!

Observational or Manipulative? Observation.

3. Hypothesis-driven? Yes!

Observational or Manipulative? Manipulative.

We can make the conclusion that is the ecologist used the manipulative method in her research since she decided to place the turtles in two different types of ponds; one where half the ponds have predators while in the other the pond the predators have been removed. In other words, she manipulated the independent variables.

4. Hypothesis-driven? Yes!

Observational or Manipulative? Observational.

Note, the use of the word, "predicts" in most instances underscores the tone of hypothesis-driven research, hence we can say Yes! And remember, we are told the researcher "collects data", meaning he is merely observing differences that occur naturally.

5. Hypothesis-driven? No!

Observational or Manipulative? Observational.

6. Hypothesis-driven? No!

Observational or Manipulative? Observational.

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3 years ago

A crystal is always... A. a hexagon B. a cube C. a liquid D. none of these

NARA [144]

D because its a solid

3 0

3 years ago

Read 2 more answers