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4 years ago

Please help as soon as possible DUE TOMORROW

Biology

1 answer:

Readme [11.4K]4 years ago

4 0

Answer:

D. loose layers bond together over time.

Explanation:

The sediment in sedimentary rocks are formed when weather and erosion break down the rock into loose material.

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What does the cytoskeleton do

Elena L [17]

The cytoskeleton provides structural framework for:Cell shape.

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3 years ago

1. Although generally not considered to be alive, a is studied alongside other microbes such as bacteria. 2. The protein coat th

Greeley [361]

Answer:

virus
capsid
lytic cycle
lysogenic
prophage
bacteriphage

Explanation:

1. Virus is sometimes considere to be alive because of its ability to replicate. But, since the replication of the virus is immposible without the host, virus is more often called infectious agent (not organism). Virus can infect bacterial cells, human animal and plant cells. Their genetic material can be DNA or RNA, so the viruses are classified as DNA and RNA viruses. Beside genetic material, viral particles virions also contain protein coat and lipid envelope.

2.Virions (viral particles) contain genetic material (DNA or RNA), protein coat called capsid and lipid envelope. The role of capside is to provide protection to genetic material. It is composed of protomers-oligomer protein subunits. The structure of the capsid is helical or icosahedral. Capsid can be enveloped with lipid layer-viral envelope. Capsid is involved in the process of interaction with the host and with the delivery of the genome into the host.

3. The lytic lifestyle of the viruses (e.g. bacteriophage) can be described through the next steps:

attachment and injection into the host cell (e.g.bacterial cell)

synthesis of the early virus proteins which break down host's DNA

virus uses host's machinery (for the replication, transcription and translation) to produce the rest of its proteins and to form new virus particles.

host cell burst and many new virus particles are released.

After the destruction of the cell, the virus must find new host.

4. Lysogenic cycle is other type of viral life cycle. During the lysogenic cycle, virus does not kill the host immediate. It integrates its DNA into host's genome and stays dormant until conditions are optimal for reproduction. Viral genome replicates along with the host's. Dormant state lasts until host conditions deteriorate, then the prophage becomes active.

5. Prophage is a viral genome that is inserted into the genome of the host or sometimes it can existas an extrachromosomal plasmid. Bacteriophage integrates prophage during the lysogenic cycle (latent, dorman phase of the cycle). When the host conditions deteriorate, the prophage becomes active meaning it becomes excised from the host. This process is called prophage induction. The virus then begins with the lytic cycle.

6. Bacteriphage is a virus that infects the bacterial cell. Its structure is typical viral structure-genetic material (DNA or RNA), protein coat called capsid and lipid envelope. The lifecycle of bacteriophage includes the steps: attachment and penetration of the bacterial cell, synthesis of proteins and nucleic acid, assembly of virions, release of virions.

Bacteriophages are used as antibacterial agents (treatment of bacterial infections).

7 0

3 years ago

Which shoes the levels of organization in multicelur organisms from implest to most complex

Inessa05 [86]

Answer:

The biological levels of classification from simplest to most complex are:

Organelles: The different structures from which a cell is made. For example, ribosomes, vacuoles etc

Cells: The basic unit of life. For example, red blood cells

Tissues: Cells which work together. For example connective tissue

Organ: different tissues work together to form an organ. For example, the heart

Organ System: Different organs work together to form an organ system. For example, digestive system

Organism: Different organ systems work together to form an organism. For example, a human

Species: Organism which can interbreed and produce fertile offsprings. For example, humans in any part of the world.

Population: Group of organisms of a particular species living together in an area at a particular time. For example, humming birds living together in a forest.

Community: Different populations living in a particular area at a particular time. For example, a group of birds, animals and plants living in an area at a particular time

Ecosystem: The biotic and abiotic factors in an area combine to form an ecosystem. For example, animals living in a fores along with the non-living components such as water, shelter, sun light etc.

Biosphere: All the ecosystems of the world combine to form a biosphere.

Explanation:

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3 years ago

Which part of the nervous system will be most active when Martin, a backpacker, acts quickly in response to a wild animal approa

Pani-rosa [81]

Sympathetic nervous system

8 0

3 years ago

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The zebra mussel arrived in the United States in 1985 on the ballast of a ship. Since this time, it has spread rapidly throughou

AveGali [126]

The answer is most likely the second choice. All answer choices could be possible, but in light of the others the second choice is far too specific, and there is no information in the prompt to even indicate that as a plausible answer choice.

3 0

4 years ago

Read 2 more answers

Please help as soon as possible DUE TOMORROW ​

Please help as soon as possible DUE TOMORROW