BIOLOGY HIGH SCHOOL

True or False? Antigen presentation to T cells is the key effector function attributed to neutrophils.

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Answer 1
Answer:

Answer:

False. They are not antigen-presenting cells.

Explanation:

Neutrophils produce by the body in the bone marrow, they are known as the most abundant type of WBC around 60-70% (white blood cells). They are also known as an important part of the innate immune system.

They are highly mobile, short-lived, and they have the ability to enter the different parts of tissues. Neutrophils' primary function is known as phagocytosis they help to prevent infections by invading particles.


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HIGH SCHOOL

Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of

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Answer: gaps left at the 5' end of the lagging strand.

Explanation:

Eukaryotic Chromosomes are known as the repetitive at the very ends of chromosomes, found in a wide range of Eukaryotic species. They protect the end chromosomes from deterioration or fusion with the neighboring chromosomes.

Telomeres provide a mechanism for their replication by semi conservative DNA replication (a replication in which two parental DNA strands would act as a template for new DNA strands to be synthesized) and length maintenance by Telomerase Enzymes. Telomerase Enzymes are used to extend shortened telomeres during its’ DNA replication.  

DNA replication in Eukaryotic Telomeres doesn’t begins at the either end of the DNA strands but starts in the center, and considering that all known DNA Polymerase ( an enzyme that is essential for DNA replication) read the template strand in the 3’ to 5’ direction, one finds a leading strand and a lagging strand on the DNA molecule being replicated.

On the leading strand, DNA Polymerase make complementary DNA strand without any difficulty because it reads the template strand from 3’ to 5’.

On the other hand, there is a difficulty going in the other direction on the lagging strand.

WHY? This is   “due to gaps left at the 5’ end of the lagging strand”. To overcome this difficulty, short sequences of RNA acting as Primers (a short single-stranded nucleic acid utilized by all living organisms in the initiation of DNA synthesis) attach to the lagging strand, a short distance ahead of where the initiation site was.

I hope this helps alot!

HIGH SCHOOL

Food moves through the digestive tract by what means

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Peristaltic movement in the digestive tract.
HIGH SCHOOL

During elongation, a charged trna first enters the ribosomal ________ site and then moves into the ________ site.

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3 sites in a ribosome:

The charged tRNA first enters the ribosomal A site...then moves to the P site and finally to the E site.

Because they only ask for 2 I would say A then P.
HIGH SCHOOL

What are flagella? a. hairlike fibers for mobility b. bacteria found on plants c. fruit that grows in rain forests d. leaves found on flag trees

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Flagella is a hairlike fibers for mobility. 

 During bacteria, a large, whiplike proteinaceous flipper, used for velocity.
A.) little tale like thing
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