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Alika [10]
3 years ago
8

Please answer the two questions

Biology
1 answer:
qaws [65]3 years ago
4 0

Answer:

1. No 2. HMS Beagle

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Arrange these components of the mammalian immune system as it first responds to a pathogen in the correct sequence. I. Pathogen
stepan [7]

Answer:

<u>III → IV → II → I → V</u>

Explanation:

The first response would be binding of antigenic determinants from pathogen to the receptors on lymphocytes then lymphocytes would become active and they increase their quantity followed by secreting antibodies that will eventually destroy the pathogen. Memory cells will recognize this pathogen as foreign body and they will always remember it.

8 0
3 years ago
A student mixes various molecules needed for DNA replication. When he adds DNA, replication occurs, but each DNA duplex consists
weeeeeb [17]

Answer: DNA Ligase

Explanation:

During DNA replication, both the parental DNA strands are separated and act as templates for the synthesis of new strands. The formation of the new strands occurs in only 5'-3' direction and thus both the strands are synthesized in a different manner. One new strand with the template of 3'-5' direction will be synthesized continuously and is called a leading strand. The other strand with the template of 5'-3' direction will be synthesized discontinuously in the form of DNA fragments. These fragments are called Okazaki fragments and the strand is called a lagging strand. DNA ligase connects these fragments later to form a continuous lagging strand.

Therefore, DNA ligase is required for ligation of Okazaki fragments, and in absence of DNA ligase, the ligation of fragments will not occur and the newly synthesized strand will be discontinuous. However, if DNA ligase is not present in the reaction mixture, then the chances are that not all the newly synthesized DNA strands will be discontinuous. Only the DNA molecule with the lagging strand will be in the form of fragments.

3 0
2 years ago
In which muscles is overactivity or tightness common for individuals who regularly wear high heels?
frozen [14]

Answer: Gastrocnemius, soleus, and Achilles tendon

Explanation:  

The heel cord or achilles tendon is also known as calcaneal tendon is found at the back of the leg and is known to be the thickest bone in the human body.

It is attached to the plantaris, calf muscles (gastrocnemius) and soleus muscles. A person who wears heels regularly for a longer period of time suffers from pain and inflammation in muscles of leg.

These muscles helps in the walking and other movements of the legs. Wearing heals and walking is quite painful.

4 0
3 years ago
All cell membranes are primarily composed of _____________.
dezoksy [38]
Cell membranes are made of phospholipids to keep the cell's water (cytoplasm) in and everything else out. so your answer would be D <span />
7 0
3 years ago
Read 2 more answers
Suppose a mother carries two recessive genes for freckles (rr) and a father carries one recessive gene for freckles and one domi
skad [1K]
Answer - A
The ratio of a child with clear skin with that of freckled skin is 1:2.
When genotype rr mates with genotype Rr, the following genotypes are expected:
Rr = clear skin dominant
rr= freckled skin

8 0
3 years ago
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