Question

21.) The cell needs energy to fuel endergonic reactions. Where does that energy come from? a....

21.) The cell needs energy to fuel endergonic reactions. Where does that energy come from?

a. ATP hydrolysis

b. Breakdown of glucose

c. anabolism

d. catabolism

e. A, B, D

22.) The polarity of water drives which of the following?

a. hydrogen bonding

b. protein folding

c. hydrophobic effect

d. B and C

e. A, B, and C

23.) The primary role of oxygen in cellular respiration is to _____.

a. yield energy in the form of ATP as it is passed down the respiratory chain

b. act as an acceptor for electrons and hydrogen, forming water

c. combine with carbon, forming CO2

d. combine with lactate, forming pyruvate

e. catalyze the reactions of glycolysis

24.) The reason that the genetic code can correctly specify the order of amino acids in a polypeptide is:

a. amino acids are covalently joined to the codons in an mRNA.

b. the ribosome recognizes codons and directly attaches amino acids.

c. specific tRNAs become attached to specific amino acids.

d. mRNAs form a shape that allows attachment of the right amino acid.

25.) What determines whether a chemical reaction is spontaneous?

a. if it increases the disorder, or entropy, of the substances involved

b. if it decreases the potential energy of the substances involved

c. the temperature only—reactions are spontaneous at high

d. temperatures and nonspontaneous at low temperatures

e. the combined effect of changes in potential energy and entropy

Science   Biology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

21) E- A, B, D

22) a- Hydrogen bonding.

I'd like to explain this as there might arise confusion and option e may seem correct too. I chose 'a' because

1. Protein folding is a result of hydrophobic force and not polarity of water.

2. Hydrophic effect does not occur due to polarity of water. It occurs because molecules are hydrophobic and acquire a state of lower energy when they bind to non-polar molecules. Like dissolves like. So entropy and enthalpy are driving force for hydrophobic effect.

23) b - Act as acceptor of electron and hydrogen forming water

24) c- specific tRNAs become attached to specific amino acids

25) e- The combine effect of changesin potential energy and entropy.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A. What is a condensation reaction? B. Why do condensation reactions require energy? Use concepts such...
A. What is a condensation reaction? B. Why do condensation reactions require energy? Use concepts such as potential energy and entropy in your answer. C. Describe the link between spontaneous/nonspontaneous reactions and energy.
How do the light reactions produce ATP? Select one: a. Potential energy stored in a hydrogen...
How do the light reactions produce ATP? Select one: a. Potential energy stored in a hydrogen ion (H+) gradient is used to synthesize ATP. b. Photosystem I directly adds a phosphate to ADP. c. Photosystem II directly adds a phosphate to ADP. d. Energy released by electrons is directly used to synthesize ATP.
One important difference between the anatomy of roots and the anatomy of leaves is that _____....
One important difference between the anatomy of roots and the anatomy of leaves is that _____. a. Leaves are covered in a waxy cuticle and stomata, which is absent from roots b. Only roots have ground tissue c. Only leaves have epidermal tissue d. Root cells have cell walls and leaf cells do not e. Roots contain vascular tissue, whereas leaves do not Which of the following statements regarding ATP is true? a. It has high potential energy because it...
1)To lower the energy barrier in a reaction, enzymes change the path of the reaction between...
1)To lower the energy barrier in a reaction, enzymes change the path of the reaction between the reactants and products by doing what? A. Destabilizing the transition state by increasing the free energy to be used and lowering the activation energy B. Releasing carbonic acid into the environment to stabilize the transition state and lowering the activation energy C. Reduce the activation energy by stabilizing the transition state and decreasing its free energy D.Supply heat to stabilize the reactants and...
40. This amino acid is not commonly found in a b-pleat. A) Alanine B) Tryptophan C)...
40. This amino acid is not commonly found in a b-pleat. A) Alanine B) Tryptophan C) Leucine D) Valine E) Isoleucine 47. These amino acids would contribute to forming bridge salts in protein secondary and tertiary structures: A) Arginine, Lysine, Glutamic Acid, Aspartic Acid B) Methionine, C) Serine, Threonine D) Tryptophan, Tyrosine, Phenylalanine E) None of the above 24. The structure and general chemical composition of the cell membrane is similar to the membranes of organelles. True or false? 28....
39) Aquaporins and most enzymes are similar in many aspects, but NOT in this: A) They...
39) Aquaporins and most enzymes are similar in many aspects, but NOT in this: A) They are specific for certain molecules B) They are proteins C) They are catalysts D) They have three-dimensional (3-D) structure 40) Organisms do NOT use heat to overcome EA and speed up chemical reactions. Why not? A) Heat would only speed up endergonic reactions B) High temperature might denature cellular proteins C) The energy barrier for most chemical reactions could not be surmounted by heat...
1. Which sentence best defines signal transduction in a biochemical context? a. Alteration of cell functions...
1. Which sentence best defines signal transduction in a biochemical context? a. Alteration of cell functions in response to the environment b. Generation of a chemical change in response to information c. Induction of cell death upon nutrient starvation d. Responses to stimuli 2. Which statement is correct? a. G protein-coupled receptors produce second messengers indirectly while receptor enzymes catalyse second messenger generation b. Second messengers stimulate the activity of G protein-coupled receptors. c. Receptor enzymes produce second messengers through...
The scientific method is best distinguished from earlier forms of knowledge by Accurate measurements              b. inductive...
The scientific method is best distinguished from earlier forms of knowledge by Accurate measurements              b. inductive reasoning           c. deductive reasoning d. publishing of results                 e. experimentation Which one word best describes a tentative explanation of the data? a. control        b. deduction    c. theory          d. placebo       e. hypothesis An explanation which has been widely tested, which is not found to be false, and which explains a large group of observations is called                      a. quantitative analysis           b. a theory Qualitative...
When is a hypothesis considered scientific? a. when it is based on something other than observation...
When is a hypothesis considered scientific? a. when it is based on something other than observation b. when it can be tested and is refutable c. when it relies on anecdotal evidence d. when it relies on mystical explanations e. All hypotheses are considered scientific until experiments determine otherwise. 3. Of the following, which is the earliest step in the scientific process? a. generating a hypothesis b. analyzing data c. conducting an experiment d. drawing a conclusion e. developing a...
1 In the absence of oxygen, cells consume glucose at a high, steady rate. When oxygen...
1 In the absence of oxygen, cells consume glucose at a high, steady rate. When oxygen is added, glucose consumption drops precipitously and is then maintained at the lower rate. Why is glucose consumed at a high rate in the absence of oxygen and at a low rate in its presence? 2 In the following diagram showing the distribution of thermal energy in a population of substrate molecules, the energy thresholds indicated by numbers represent ... Energy per molecule Number...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT