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2 years ago

Which of these organelles is absent in a prokaryotic cell? ribosome nuclear membrane plasma membrane

Biology

2 answers:

garri49 [273]2 years ago

5 0

I'd have to agree with him/her/other.

aleksley [76]2 years ago

4 0

Some of the important features of a prokaryotic cell is that it contains a plasma membrane, ribosomes, and genetic material (DNA) that is not bound by a membrane. Therefore, prokaryotic cells lack a nuclear membrane.

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Water is warmed by the sun and

IceJOKER [234]

Answer: The water is warmed up by the sun and then it evaporates into the atmosphere. The sunlight warms the water by its heat.

Water is then cooled down and condensation takes place.

The water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

Water and nutrients that are not recycled on earth are stored in the form of reservoirs.

Explanation:

3 0

2 years ago

Which is useful for high-throughput sequencing, but is not part of sanger dna sequencing?

Shalnov [3]

Roche/454 pyrosequencing , useful for high throughput sequencing techniques. This method utilizes pyrosequncing which allows for sequencing as the sequence read out can be achieved at the same time as the sequence is extended.

High- throughput screening is the use of automated equipment to rapidly test thousand to millions of samples for the biological activities at the model organism, cellular, pathway or molecular level.Many DNA samples can be sequenced simultaneously.

Sanger DNA sequencing also known as chain termination. This method is used only for the single DNA fragment at a time. Amplicon sequencing with NGS is efficient and cost effective . It is required a DNA polymerase , nucleotide , dideoxynucleotides and buffer.

To learn more about High- throughput screening here

brainly.com/question/2509675

#SPJ4

5 0

2 years ago

What is innate immunity? Discuss the barriers associated with innate immunity.

Rama09 [41]

Answer:

Innate immunity is a nonspecific defense mechanisms that play its role as soon as an antigen appear in the body (it is relatively rapid but nonspecific and because of that it is not always effective)

Explanation:

The barries of innate immunity are:

Skin: At Epidermal surface, its protective aspect are keratinized cells that lives on the surface, known as Langerhans cells.

Skin sweat or secretions: Their specific defense is sweat glands and sebaceous glands, and their protective aspect is low ph and washing action.

Mucosal surfaces: they are at the mucosal epithelium, and their protect aspects are nonkeratinized epithelial cells.

Oral cavity: They defend salivary glands through Lysozyme

7 0

3 years ago

Which of the following represents organisms in a food chain?

Lisa [10]

Answer: c seeds, mice, snakes

Explanation:

a hawks, owls, eagles NO

These animals all eat some form of meat, and they are on the top of all of their food chains. If you put these animals in a room with no food, there'd be no food chain, and they would got out at each other until there was one left, and there'd be no advatanges because 1. they can all fly and 2. they are all top consumers. The same thing goes for D except hyenas can't fly.

b deer, rabbits, cows NO

This is not a food chain because all of the animals are herbivore, so they only eats plants and will not eat each other.

c seeds, mice, snakes YES

The seeds are a producer which is to be eaten by a consumer (the mouse), and which are then eaten by the predator, the snake.

d hyenas, vultures, crows NO

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great Valentines Day! :-)

- Cutiepatutie ☺❀❤

7 0

3 years ago

Sickled red blood cells are believed to block blood that is trying to exit the corpus spongiosum, which for men causes:

Xelga [282]

Answer:

Answer is B. Priapism.

Explanation:

Corpus spongiosum are the three cylinders encased in the bucks fascia. They run through the glass and shaft of the penis, and during erection, they contain almost 85-90% of theology volume.

Priapism can be described as persistent erection of the penis, which is caused by excessive blood flow to the penis or when blood is trapped inside the penis blood chambers I. e, corpus spongiosum.

Priapism can be of two types, they are

1. High- flow Priapism : this is caused when the artery supplying blood to the penis is damaged, thereby, causing it to be oversupplied with oxygenated blood. This type is not painful and can be treated by adopting cold therapy, the use of ice packs.

2. Low-flow Priapism : This occurs when old blood is trapped inside the penis blood chambers. This type is very painful and require urgent medical attention.

Note that, the second type of priapism,low-flow priapism, is caused in the case of a sickled-cell person, because the shape of the blood cell can easily trap blood in the penis.

5 0

3 years ago