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Helen [10]
3 years ago
13

How do scientists know that humans originated in Africa?

Biology
1 answer:
exis [7]3 years ago
4 0
The oldest bones of human decent were found in Africa
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A mutation in a G-protein prevents the alpha-subunit from dissociating from the beta/gamma-subunit. What effect will this have o
Ymorist [56]

Answer:

the pathway will be under-expressed.

  • the alpha subunit helps to bind with either GDP or GTP. when the α subunit is bound with GDP, it will be bound to β and γ subunits and thus forms an inactive state for G-protein.
  • when the alpha subunit binds with the GTP, it becomes activated and dissociates β and γ subunits.

if G-protein Coupled Receptor is unable from dissociating β and γ subunits, then the pathway will go under expression.  

The chemical qualities of the alpha subunit allow it to bind easily to one of two guanine subunits, GDP or GTP. The protein thus has two functional formations. When GDP is bound to the alpha subunit, the alpha subunit remains bound to the beta-gamma subunit to form an inactive trimeric protein.

G-proteins, cAMP, and Ion Channel Opening. The alpha subunit activates adenylate cyclase, in purple, and loses GTP. Adenylate cyclase converts ATP to cyclic AMP, which then activates Protein Kinase, shown in blue. Protein Kinase phosphorylates an ion channel, letting sodium ions rush into the cell.

As a result of the ligand binding to its site on the G-protein-linked receptor, A) the G-protein changes conformation and GTP replaces the GDP on the alpha subunit. ... Inactivation of the alpha subunit occurs when its own phosphorylase activity removes a phosphate from the GTP.

8 0
2 years ago
A group of students is setting up a test to see whether earthworms prefer rough or smooth surfaces which type of investigation i
dezoksy [38]

Answer: The answer is A. Comparative

Explanation: The photo shows two different types of soil with the same type of worm. Therefore this it a comparative experiment. Trust me I got this question correct.

7 0
3 years ago
Slicon it position on the periodie table and its chemical properties based on that position​
Inessa05 [86]
It is quite hard to say
3 0
1 year ago
In what ways are the features of a plant living in water different from a plant living on land ?
lesya692 [45]

Answer:

Earth, both on land and in water. Wherever they

live, plants provide food and oxygen to the

creatures that live nearby – including humans!

In this activity we will examine both a

terrestrial (land) plant and an aquatic (water)

plant. They have many things in common, but the

ways they get air, food and water change along

with the environments in which they live.

Explanation:

7 0
3 years ago
9. PLEASE HELP A LOT OF POINTS
MissTica

Answer:

im pretty sure its D

Explanation:

sorry if im wrong

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3 years ago
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