Which of the following occurs during anaphase I of meiosis?(A) Formation of tetrads
(B) Separation of homologous chromosomes
(C) Crossing over
(D) Separation of sister chromatids, with one chromatid pulled toward each pole
(E) Assembly of chromosomes along the equatorial plane

Answers

Answer 1

Answer: Separation of sister chromatids (D)

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Telomerase Indicate whether each of the following statements about telomerase is true or false. 1. With each cell division, chromosomes gradually shorten in the absence of telomerase activity. TrueFalse 2. During embryonic and childhood development in humans, telomerase activity is relatively low compared to the level of activity in most somatic cells of an adult. TrueFalse 3. Cells that divide frequently tend to have relatively low levels of telomerase. TrueFalse 4. The activity of telomerase in most mature somatic cells is kept high by increasing the expression of the gene encoding this enzyme. TrueFalse 5. Mice with low telomerase activity appear to be normal for up to six generations, but they show steadily decreasing telomere length that eventually leads to nonviable offspring. TrueFalse 6. When telomerase is added to cells grown in culture, their lifespan decreases relative to controls that have no telomerase added. TrueFalse 7. Cancer cells generally have high levels of telomerase activity, which allows them to divide indefinitely without the chromosomes getting shorter and shorter. TrueFalse
Question 12An allotrope of carbon that is soft and can be used as a lubricant is ____.A)diamondB)graphiteC)sandD)silicon

Why are antibiotics ineffective against viral infections

Answers

Antibiotics are ineffective against viruses because viruses do not have cells.

Antibiotics are commonly known and used to cure infections with bacteria, not viral infections.

The reason to this is because viruses use their host cells to live as they are intracellular parasites.

Antiviral drugs are usually used when there are viral infections. This prevents them from reproducing and improves the immunity.

Hope I helped. :)

Why is pollution never a strictly local problem

Answers

Because there are many types of pollution.
Air pollution, water pollution, etc.
The reason it is never local is because it's a chain reaction to the environment.
Example 1:
China has the worst air pollution in the world from factories and cars. The smoke has a depleting effect on the O-zone layer which protects humans from the sun's harmful UV rays. Also, without the protection of the o-zone layer, global warming is increased (yes, it's real) and glaciers begin to melt raising water levels and so forth. So even though the smoke is all the way in China, it affects all of us living on earth.
Example 2:
Let's say there is a oil spill in the ocean which potentially kills or endangers many organisms, like fish. Even though the oil spill was only in that part of the ocean, it affects all the animals because of something called the food chain. If all of a certain fish or animal dies out and that was another animals primary source of food, then it messes up the chain.

What are blocks of time in the geological time scale called?

Answers

Answer:

The block o time in the geological time scale are called:

Eon: The biggest ones

Eras: Which are the middle ones

Periods: Which are the smallest ones.

Explanation:

The geological time scale classifies the lapses of time in different gradients. It does it like that to optimize the retrieval of data and locate the objects and phenomenons of study to analyze them and conduct the research in an organized way. Eons are classified in Archean, Proterozoic, and Phanerozoic. Eras are classified in: Early archean, middle archean, late archean, Early proterozoic, Middle proterozoic, late proterozoic, Paleozoic, Mesozoic, Cenozoic. Periods are classified in Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian, Triassic, Jurassic, Cretaceous, Tertiary, Quaternary.

The blocks in the geological time scale are: Eons , Era , and Periods

What does DNA splitting into two parts called?Dna translation
Dna Transcription
DNA replication
DNA degredation

Answers

DNA splitting is DNA replication.

Answer:

dna replication

Explanation:

Of the three louse vectored pathogens here, which is or are unable to invade the insects gut and penetrate into its body cavity to grow and reproduce?

Answers

Three Louse Vectored Pathogens

Explanation:

The body louse , Pediculus humanus corporis, is the vector of three human pathogens such as the operator of pandemic typhus and Borrelia recurrentis and Rickettsia prowazekii,

The specialist of backsliding fever and Bartonella quintana, the operator of channel fever, bacillary angiomatosis, endocarditis, incessant bacteremia, and constant lymphadenopathy.
Mite borne ailments can be related with high rate of illness and demise, particularly scourge typhus and backsliding fever, which can be lethal in up to 40% of patients.
The ailments are for the most part common in individuals living in neediness and packed conditions, for instance, vagrants and those associated with war circumstances.

Salt, sand, water, or stones are __________ substances found in nature.A) mineral

B) hypothesis

C) energy

D) force