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Akimi4 [234]
3 years ago
7

What is one of the first things that is done when bones are discovered

Biology
2 answers:
Ilia_Sergeevich [38]3 years ago
5 0

carbon date then figure out what species

Mademuasel [1]3 years ago
4 0

Answer:

The first thing to do is carbon dating, to find out how old these bones are.

Explanation:

Carbon dating is done by a technique called "Carbon-14" and is performed when a skeleton is found to determine how many years have passed since the death of that organism. This technique allows the years of this skeleton to be counted, because living beings are rich in carbon molecules in their composition. When an individual dies, the carbon-14 molecule in its composition dies too, so dating that molecule allows you to date how long that organism has been dead.

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A bear walks into the room. In response, you run away. Trace the events that occur from the initial release of epinephrine to th
Kaylis [27]

Answer:

a. Epinephrine >> G protein-coupled receptor >> cAMP >> phosphorylation of glycogen phosphorylase and glycogen synthase >> glucose

b. Cellular respiration >> glycolysis >> pyruvate oxidation >> Krebs cycle >> acetyl CoA>> oxidative phosphorylation

c and e. Acetylcholine >> nicotinic receptors >>  sodium ions (enter to the cells) >> muscular action potential >> contraction

d. Action potential >> resting potential >> potassium channels open >> sodium channels open >> threshold potential >> voltage-gated sodium channels and potassium channels open >> membrane  repolarization >> resting membrane potential (steady state of the cell)

​Explanation:

Epinephrine binds to G protein-coupled receptors, triggering the production of cyclic AMP (cAMP). cAMP is a second messenger associated with the phosphorylation of 1-glycogen phosphorylase (GP) that breaks down glycogen (the storage form of glucose) into glucose, and 2-glycogen synthase (GS), involved in the production of glycogen (i.e., phosphorylation inhibits GS activity). On the other hand, during cellular respiration, glucose is used to synthesize ATP via three sequential steps: glycolysis, Krebs cycle and oxidative phosphorylation. During glycolysis, glucose is converted into pyruvate that is subsequently oxidated into Coenzyme A (acetyl CoA), generating NADH and ATP. In the Krebs cycle, acetyl CoA is combined with the oxaloacetic acid to form citric acid, generating NADH, FADH2 and ATP. During oxidative phosphorylation, electrons from NADH and FADH2 are used to pump protons against an electrochemical concentration gradient, which is finally used to synthesize more ATP. On the other hand, during muscle contraction, acetylcholine binds to nicotinic receptors and sodium ions enter the muscle fiber, thereby generating a muscular action potential that travels across muscle cells and triggers muscle contraction when calcium ions (Ca2+) bind to the protein complex troponin by sarcomere shortening (sarcomeres are the functional units of muscle fibers). This contraction ends when Ca2+ ions are pumped back into the sarcoplasmic reticulum (a unique organelle of endoplasmic reticulum in the sarcoplasm). On the other hand, an action potential is defined as a fast and propagating change of the resting membrane potential of neuron cells. In the resting potential, potassium ion (K+) channels open, thereby K+ ions can enter/exit inside the cell. A stimulus causes the depolarization of the cell by opening Na+ channels that enter into the neuron. At the threshold potential, more sodium channels open, thereby voltage across the membrane reaches its most positive value. Subsequently, channels begin to close and more potassium channels open. Finally, the membrane repolarizes (K+ ions leave the cell) and cells return to the resting membrane potential, i.e., the steady-state of the cell.

5 0
3 years ago
A student observes 5,000 RFUs in a 200μl aliquot from a G3-500 ml culture. How many total RFUs will be present in a G3-15ml samp
natka813 [3]

Answer:

The maximum no. of RFUs collected in the purification procedure = 3.05 \times 10^5 RFUs

Explanation:

No. of RFUs in a 200 ul (0.2ml) aliquot = 5000 RFUs

So, No. of RFUs in G3-500 ml culture = 5000 \times \frac{500 ml}{0.2 ml} RFUs

                                                               = 5000 \times 2500 RFUs  

                                                                = 1.25 \times 10^7 RFUs

Similarly, No. of RFUs in a G3-15ml sample = 5000 \times \frac{15 ml}{0.2 ml} RFUs

                                                                          = 5000 \times 75 RFUs

                                                                          = 3.75 \times 10^5 RFUs

The maximum no. of RFUs collected in the purification procedure

= 3.75 \times 10^5 \times 80% RFUs

= 3.75 \times 10^5 \times 0.80 RFUs

= 3.05 \times 10^5 RFUs

5 0
3 years ago
My test is timed PLse answer
Yuri [45]
I wanna say the answer is a 
5 0
3 years ago
PLZ HELP URGENT. WILL GIVE BRAINLIEST!!!!!
vlabodo [156]

Answer:

1. Asexual Reproduction (If there is only one organism reproducing)

2. Selective Breeding

Explanation:

1. If there is only one parent organism that means the offspring it is a carbon copy of its parent.

2. Selective breeding is breeding to bring out more desirable traits out of the species, like how dog breeders breed for better sense of smell or hearing.

8 0
3 years ago
Why is it important for the cells produced in meiosis to be haploid?
Contact [7]

Answer:

The overall process of meiosis produces four daughter cells from one single parent cell. Each daughter cell is haploid, because it has half the number of chromosomes as the original parent cell. ... Unlike in mitosis, the daughter cells produced during meiosis are genetically diverse.

3 0
2 years ago
Read 2 more answers
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