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pantera1 [17]
3 years ago
8

Tamara’s muscle weakness and fatigue becomes progressively worse over the course of the day. This is a hallmark sign of myasthen

ia gravis, an autoimmune disorder that affects the ability of a motor neuron to communicate with a muscle fiber. What synaptic events must happen first for excitation to occur?
Biology
1 answer:
vekshin13 years ago
6 0

Answer: Acetylcholine is released from the axon terminal and diffuses across the synapse to link to a receptor in the surface of the motor end plate.

Explanation:

Sinapsis in biology is a structure in which a neuron cell communicates with another using an electric or chemical sign.

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Why is agreement between the fossil record and phylogenies constructed from living organisms considered strong evidence of evolu
tatuchka [14]

Both of those two independent methods of investigation resulted in the same pattern which means it is significant.

Fossil records explain the history and evolution of life based on fossils. Fossils are remains of organisms preserved in sedimentary rock. In fossil records they are analyzed and arranged chronologically and in taxonomic order, so that can represent the evolution.

Phylogenies describes the relationships between organisms (species): from which organisms it is evolved, to which species it is most closely related etc.

It is used to organize living organisms into specific categories.

8 0
3 years ago
If a Sequoia sempervirens tree is 100 m tall and a drawing of it is 100 mm tall, what is the magnification of the drawing?
Anuta_ua [19.1K]
I'm not in high school but I think it's ten or 100
6 0
3 years ago
Embryology is the study of the development of an
Rus_ich [418]

Answer:

Embryo

Explanation:

It's in the name

7 0
3 years ago
Read 2 more answers
In which order will free nucleotides add on to a single strand of DNA with the sequence ATTGCA during DNA replication?
AnnZ [28]
The answer is T A A C G T.

Replication is a process in which DNA molecule is copied, and thereby two identical DNA molecules are produced.  Complementarity is achieved through interactions between nucleobases. In the DNA, base complements are adenine - thymine (A-T) and guanine - cytosine (G-C). 

So, free nucleotides will add in the following order <span>T A A C G T:
original strand                 new strand
     A                                       T
     T                                       A
     T                                       A
     G                                      C
     C                                      G
     A                                       T</span>
6 0
3 years ago
How does sexual life cycle increase the genetic variation in a species
SCORPION-xisa [38]

Answer:

The behavior of chromosomes during meiosis and fertilization is responsible for most of the variation that arises in each generation. Three mechanisms contribute to genetic variation arising from sexual reproduction: independent assortment of chromosomes, crossing over, and random fertilization.

3 0
3 years ago
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