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I asked this question before I still don't get it. Using Flutter ver 3.3.2 

Return value is missing see attachment on the bottom of this page.


Here is the full code and the screenshot below the full code. Also when putting in the answer can you put in the full code. Because I put in the previous answers I still got error messages.

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

void main() {

runApp(const MyApp());
class MyAppState extends State<MyApp>{
Widget build(BuildContext context) {
class MyApp extends StatefulWidget {

const MyApp({super.key});


MyAppState createState() => MyAppState();

class LoginData {
String username = "";
String password = "";

class _MyApp extends State {

LoginData loginData = LoginData();
final GlobalKey<FormState> _formkey = GlobalKey<FormState>();

Widget build(BuildContext inContext) {
return MaterialApp(home: Scaffold(
body : Container(
padding : const EdgeInsets.all(50.0),
child : Form(
key: _formkey,
child: Column(
children: [
keyboardType: TextInputType.emailAddress,
validator: (String? inValue) {
if (inValue?.isEmpty?? true) {
return "Please enter username";
return null;
onSaved: (String? inValue) {
loginData.username = inValue!;

decoration: const InputDecoration(
hintText: "[email protected]",
labelText: "Username (eMail address)"


obscureText: true,

validator: (String? inValue) {
if (inValue == null) {
return "Password cannot be null";
} else if (inValue.length < 10) {
return "Password must be >= 10 in length";
return null;

onSaved: (String? inValue) {
loginData.password = inValue!;

decoration: const InputDecoration(
hintText : "Password",
labelText : "Password"


child : const Text("Log In!"),

onPressed: (){

if (_formkey.currentState!.validate()){


if (kDebugMode) {
debugPrint ("Username: ${loginData.username}");
if (kDebugMode) {
debugPrint ("Password: ${loginData.password}");











Answer: The issue in the code is that the build method of the MyAppState class...

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Answer: a. reducing agent; oxidizing agent b. Succinate; CoQ c. Cytochrome bc1...

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Answer: a. NADH dehydrogenase complex, cytochrome bc complex, and cytochrome o...

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Answer: Electron transfer in the ETC is coupled to proton transfer from the ma...

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Answer: A, D, and E are correct. A. II mitochondrial membranes are ruptured, o...
Answer: The mitochondrial electron transport chain (ETC) is a series of protei...
Answer: In complex IV of the electron transport chain, protons are pumped acro...

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Answer: The steps of respiration that occur in the cytoplasm are: Glycolysis T...

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Answer: Oxygen is crucial to ATP production because it is a highly efficient e...
Answer: CO2 is produced in the Krebs cycle and oxidative phosphorylation. O2 i...

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Answer: The electron transport chain (ETC) in the inner mitochondrial membrane...

Please help me answer this question.

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Answer: The eventual reoxidation of NADH and FADH2 is crucial for the continua...
Answer: Glycolysis: 2 ATP, 2 NADH Pyruvate Dehydrogenase Complex: 2 NADH, 2 CO...

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Answer: A. CO2, NADH, FADH2 B. NADH and FADH2 E. CO2 D. NADH, O2, FADH2 C. ene...
Life science 2.1

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Answer: During heavy exercise, lactic acid can build up in our muscles because...

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Answer: Molecules brought in and used in the Calvin cycle: carbon dioxide Mole...
Answer: The light reactions of photosynthesis occur in the thylakoid membrane ...
Answer: The components of the electron transport chain found in the mitochondr...

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Answer: Pyruvate oxidation takes place in the matrix of the mitochondria. Per ...
Answer: The products produced from the light dependent reaction are ATP and NA...

molecules, respiration, photosynthesis, electron transport

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Answer: Respiration: Form of the original energy being harvested: glucose Spec...
Answer: a. When a photon of light strikes a photosystem, it is absorbed by a p...
Answer: The light reactions of photosynthesis take place in the thylakoid memb...
Answer: The dark reactions of photosynthesis, also known as the Calvin cycle, ...

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Answer: a) the light reactions and the Calvin cycle. b) synthesize simple suga...
Answer: Water, sunlight, and carbon dioxide Oxygen, ATP, and NADPH Carbon diox...

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Answer: The light dependent, that is, light-capturing reactions of photosynthe...

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Answer: A. What are the reactants of the photosynthesis reaction? carbon dioxi...
Answer: e. photophosphorylation c. absorption spectra a. Prophase I b. reducti...
Answer: Pigment: A substance that absorbs specific wavelengths of light, givin...
Answer: The first example, "Glycolysis converts one molecule of glucose to two...

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Answer: b) prometaphase a) a catabolic pathway d) during the light-independent...
Answer: a) Mitochondrial matrix; Mitochondrial inner membrane; Cytoplasm d) It...

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Answer: A. 2 (light-independent or dark reactions) B. D (light-dependent or el...

For each question,choose the ONE BEST And Give Best Explanation [No Explanation nopoints :( ]

1. Metabolismis

A. the means by whichDNA is stored.

B. the sum of all theanabolic and catabolic reactions in a cell.

C. the reactions thatbreak fuel molecules down to gain energy.

D. the reactions thatsynthesise molecules in the cell.

E. the sum of all thereactions taking place in the mitochondrial matrix.

2. The Krebscycle

A. breaks downpyruvate.

B. oxidizes two-carbonunits to produce carbon dioxide and reduced coenzymes.

C. oxidizesglycerol.

D. drives H+ out of themitochondrial matrix.

E. uses GTP rather thanATP to supply phosphate groups.

3. Which of thefollowing statements about the glycolysis pathway in the cytosol isincorrect?

A. It makes ATP.

B. It makesacetyl-CoA.

C. It interacts with thepentose phosphate pathway.

D. All but three stepsare reversible and therefore also operate in gluconeogenesis.

E. It is oxidative underaerobic conditions.

4. %u03B2oxidation

A. breaks the%u03B2-glycosidic bonds in cellulose.

B. uses acetyl-CoA,NADH, and FADH2 to produce long-chain fatty acids.

C. generates pentosesugars.

D. oxidizes fatty acidsto give acetyl-CoA, NADH, and FADH2.

E. Is part oftriacylglycerol biosynthesis.

5.Gluconeogenesis is not capable of making glucose from

A. alanine.

B. lactate.

C. glycerol.

D. palmitate.

E. 2-oxoglutarate.

6. Which of thefollowing statements is incorrect concerning photosynthesis ingreen


A. It generates ATP,NADPH, and oxygen.

B. It adds carbondioxide to a five-carbon sugar that is then cleaved to form twomolecules of


C. Its enzymes are foundin the mitochondria.

D. It uses light energyto drive the splitting of water.

E. Its enzymes are foundin the chloroplasts.

7. Positivefeedback is operating

A. when adenosinemonophosphate activates phosphofructokinase.

B. when cAMP activatestranscription of the lac operon.

C. when tryptophaninhibits transcription of the trp operon.

D. whenN-acyl-HSL promotes transcription of the luxoperon.

E. in all the examplesabove.

8. ATP

A. is converted to ADPas H+ enters the mitochondrial matrix.

B. is a coenzyme.

C. passes through theouter mitochondrial membrane by simple diffusion.

D. cannot be made in theabsence of oxygen.

E. concentrations fall to a low levelin resting cells.

Answer: B. the sum of all the anabolic and catabolic reactions in a cell. B. o...

I need help with the following question. Not so much with the first portion, but part B. Please fully explain how you derived each value used to determine the ultimate Delta G. Use 298K as the temperature. I'm really lost so thank you in advance!

Lactic acid fermenation.

(a) Write a balanced equation for the conversion of glucose into lactate.

-( Glucose +2Pi + 2 ADP ---> 2 Lactate +2ATP +2H2O)

(b) Calculate the standard free energy change of this reaction by using the following data the fact that Delta G naught prime is -25kj/mol for the following reaction:

Pyruvate + NADH + H+<---> lactate +NAD+

What is the free energy change (Delta G not Delta G naught prime) of this reaction when the concentrations of reactant are glucose= 5mM, lactate=0.05, ATP=2mM, ADP=0.2mM, and Pi=1mM?

Date given from table:

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Answer: To calculate the standard free energy change (Delta G) of the reaction...
Answer: (a) The intermediate in the reaction is not provided in the options gi...

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Answer: D-glucose and D-mannose are an epime pair. The lactate will contain C1...
Answer: 3-Phosphoglycerate (3PG) is a molecule that is produced as a result of...
Answer: If radioactive glucose labeled at carbon #6 with 14C were incubated in...

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