Which is the best characteristic that distinguishes the kingdom Archaebacteria from the kingdom Eubacteria

Answers

Answer 1

Answer: Archaebacteria are the oldest living organisms on earth. They are prokaryotes and unicellular. Archaebacteria are found in very harsh conditions (such as at the bottom of the sea or in volcanic vents). This is thought to be because the early Earth’s atmosphere was filled with poisonous gases and was very hot – nothing could survive, except the archaebacteria. These slowly gave way to modern organisms when the Earth’s conditions settled down and oxygen was introduced to the atmosphere. "

Answer 2

Answer:

Answer:

A, cell wall structure

Explanation:

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A pea plant that has round seeds has the genotype Rr. It is crossed with a pea plant that has wrinkled seeds and the genotype rr. What is the possibility that the offspring will have wrinkled seeds

Answers

The correct answer is 50%, or 1/2. We know that round seeds are dominant, since the round pea plant has a genotype of Rr and the wrinkled pea plant has a genotype of rr. If it helps, draw a Punnett square with the two genotypes.

R r
r
r

The square works exactly like a coordinate grid. Combine the letters above and beside whichever of the four spaces you chose to find the genotype for that space.

R r
r Rr rr
r Rr rr

Therefore, 2 out of 4 of the pea plants have round seeds, since a genotype of Rr means that a plant will have round seeds, and 2 out of 4 will have wrinkled seeds, since a genotype of rr means that a plant will have wrinkled seeds. 2/4 simplifies to 1/2, or 50%. Therefore, there is a 50% chance that the offspring will have wrinkled seeds.

Hope this helps!

Which of the following forms an important component of phloem tissue?A. tracheids

B.
vessels

C. companion cells

Answers

Answer: The correct answer is- C) Companion cells.

Phloem tissue is a complex conducting tissue that is present in the vascular plants and responsible for the transport of organic compound such as carbohydrates and proteins from leaves to the rest part of the plant.

The various components of phloem tissue are- Sieve element, Companion cells, phloem parenchyma, phloem fiber.

Companion cells are specialized cells ( present in association of sieve element) that perform various metabolic reactions and responsible for cellular activities. They help in loading and unloading of carbohydrate into sieve element.

C. Companion cells. THe vessels are for blood flow, Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts.

Why does the ratio of surface area to volume increase with the decrease in cell size?

Answers

The surface to volume ratio decreases as the cell size increases.

Developed over 100 years ago, Koch's postulates is no longer used to determine etiologic agents of human infectious diseases. True False

Answers

Answer:

True

Explanation:

Koch's postulates was proposed to show a causative relationship between a microbe and a disease.

Koch's postulates

•The microorganism must be present in large quantity in all organisms affected by the disease, but should not be seen in healthy organisms.

Koch abandoned this due to his discovery of asymptomatic carriers of cholera and of typhoid fever. Asymptomatic or subclinical infection carriers are seen in diseases, especially viral diseases.

•The microorganism must be seperated from a diseased organism and nutured in pure culture.

This can suspended for specific microorganisms or entities which(at the current time) can't be nutured in pure culture. Viruses uses host cells to grow and replicates and not in pure culture.

•The cultured microorganism should lead to disease when it infects a healthy organism.

It says "should", not "must".

NOTE: NOT ALL organisms introduced to an infectious agent will be infected which may be due to certain factors like general health and good immune functioning; vaccination; or genetic immunity. Its best explained using the resistance to malaria as a result of presence of at least one sickle cell allele.

•The microorganism must be reisolated from the inoculated, diseased experimental host and observed as being identical to the basic specific causative agent.

A single pathogen may lead to several disease conditions. A singualr disease infection may be due to several different microorganisms. While some pathogens cannot be cultured in a pure culture in the lab, others can infects humans.

Smokers can cause lung damage in other people

Answers

When there are people smoking, the victims (people who don't smoke) inhale the smoke causing their lungs to be the damaged. Research showed that people who break in the smoke also get affected. this is called second-hand smoking.

According to the Centers for Disease Control and Prevention (CDC), diseases caused by smoking kill more than 480,000 people in the U.S. each year. In fact, smoking is directly responsible for almost 90% of lung cancer and COPD deaths. Even with antismoking campaigns and health warnings, many people continue to smoke or start to smoke every year. About 8% of kids under the age of 18 years are current tobacco users.

which term refers to a solution with more molecules outside the cell than inside the cell? hypertonic hypotonic equitonic isotonic

Answers

The answer is hypertonic

Answer: hypertonic

Explanation:

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