1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katrin [286]
3 years ago
5

Which compound was abundant in Precambrian Earth’s oceans, before complex life evolved on Earth?

Biology
2 answers:
rjkz [21]3 years ago
8 0

Answer:

Dissolved carbon dioxide

Explanation:

Just took the test and it was correct

den301095 [7]3 years ago
6 0

Your answer is for your question is B. Dissolved carbon dioxide

You might be interested in
What is the density of a liquid with a mass of 17.4 g and a volume of 20 mL?
iren [92.7K]

Answer:

The density of the liquid is 0.87 g/ml

Explanation:

Density = 17.4g divides 20ml = 0.87 g/ml (rounded to one significant figure)

8 0
3 years ago
Read 2 more answers
What is one defining feature of a prokaryotic cell?
aev [14]
<span>C) Nucleoid
Hope this helps. c:</span>
8 0
3 years ago
The paragraph describes mitochondria and chloroplasts. WHICH sentence in the paragraph provides the strongest evidence for the e
gregori [183]

The answer is; E

This shows that these organelles were once free-living organisms  with their own mechanisms for reproduction which they have retained even after years of symbiotic relationship with the higher organisms. During their duplication, they also replicate their own DNA. Their DNA does not have histones (as opposed to the DNA in the nucleus of their host eukaryotic cell) similar to that of simple organisms such as bacteria.


4 0
3 years ago
The cells lining the proximal convoluted tubule have numerous microvilli and mitochondria. these structures are critical for the
Kaylis [27]
Microvilli which line down the luminal surface of those epithelial cells represent the resorptive function of the proximal tubule.
<span>The high quantity of mitochondria inside the epithelial cells of the proximal convoluted tubule is needed in order to supply the energy for the active transport of sodium ions (to enter the cell from the luminal side).</span>
6 0
3 years ago
Read 2 more answers
Place all eight of these steps of the insulin signaling pathway in the correct order. The abbreviation PIP 2 is used for phospha
DedPeter [7]

Answer:

The correct insulin pathway is described as under:

2. Binding of insulin to the alpha subunit of the insulin receptor

8. Activation of insulin receptor tyrosine kinase

3. Phosphorylation of IRS proteins

6. Phosphorylation of phosphinositide 3-kinase (PI-3K)

4. Conversion of PIP2 to PIP3

7. Activation of PIP3-dependent protein kinase B (PDK1)

5. Glut4 receptors transported to the cell membrane

Explanation:

The insulin signaling pathway is described as under:

RTK (receptor tyrosine kinases) which is a receptor for insulin is an extracellular receptor but in contrast to other cell surface receptors it is catalytic in nature. In the absence of insulin (ligand), it is monomeric but as soon as it gets activated (activation occurs upon ligand binding), it undergo dimerization. It leads to auto-phosphorylation in it's tyrosine residue which subsequently leads to phosphorylation of tyrosine residue of other receptors. Such hyper-phosphorylated receptor have high affinity with enzyme/molecule like IRS protein which have SH2 domain . IRS down stream activates phosphinositide 3-kinase (PI-3K). This enzyme converts component of animal cell membrane PIP2 into PIP3. PIP3 also remains membrane bound but it has the potential to phosphorylate another enzyme named as PIP3-dependent protein kinase B (PDK1). Further, PDK1 leads to the activation of Akt or PK-B. Akt is a serine-threonine kinase which ultimately leads to the recruitment of Glut4 receptors on cell membrane for uptake of more and more glucose into the cell.

Note: Apart from this Akt also phosphorylates another protein named as FOXO which ultimately causes cell growth, Akt can also phosphorylate BAD protein so as to restrict cell apoptosis or we can say it leads to cell survival, Akt also leads to translation in a cell with the help of mTOR raptor etc.  

5 0
3 years ago
Other questions:
  • Imagine that you are a graduate student working in a cancer lab. You accidentally mix unlabeled tubes of carcinoma cells with tu
    12·1 answer
  • 2. Which of the following statements best describes what happens during exercise?
    13·1 answer
  • State three benefits of vertical farming as opposed to horizontal farming.
    6·1 answer
  • What makes up about 50% of all land areas in the United States ?
    8·1 answer
  • What is the state of matter of the lithosphere?
    9·1 answer
  • A key feature of animal body plans is that they can show multiple types of symmetry. For example, a dog would represent bilatera
    5·2 answers
  • Which statement best explains how meiosis changes the DNA of successive generations?
    7·1 answer
  • Glucose travels by facilitated
    12·1 answer
  • A species has homologues chromosomes what does it say about the species?
    5·1 answer
  • 3. Identify What metal properties
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!