1. What is the connection between a person’s genes and his or her metabolism? st
ID: 65540 • Letter: 1
Question
1. What is the connection between a person’s genes and his or her metabolism?
structural proteins encoded by genes regulate metabolic pathways
DNA regulates metabolic pathways directly
enzymes encoded by genes regulate metabolic pathways
2. In a metabolic pathway, a typical control mechanism is to have: ________
a lack of reactant stimulate the pathway.
the final product inhibit an early step.
a reactant inhibit a late step.
the final product inhibit the enzyme responsible for its own production.
3. The fundamental difference between competitive and non-competitive inhibition is: _________________________
the manner of binding of the substrate to the enzyme.
the manner of binding of the inhibitor to the enzyme.
the size of the active site of the enzyme.
4. Cells or organisms tend to maintain steady internal conditions. What is the name for this property and ability of life?
Reproduction
Adaptation
Homeostasis
Metabolism
5. Which of the following are characteristics of metabolic pathways?
Contain many intermediates.
Are regulated.
Each pathway has a key enzyme that catalyzes most of the reactions
Are specific for each organism
Are often reversible
6.Which best describes body weight regulation in a normal human who is living in a modern society?
Our normal responses of appetite and metabolism ensure that adults remain at a given normal body weight. Any change from this normal weight sets in motion responses that return the body to its normal weight.
Our normal responses of appetite and metabolism tend to cause weight gain in modern societies, and they also tend to make weight loss difficult.
7. Energy is stored in different forms in the body. ATP is very unstable and is put to use very quickly in cells. Other storage molecules last longer. Which gives the major energy stores of the body in the correct order?
Short term: fat. Medium term: glycogen. Long term: glucose.
Short term: glycogen. Medium term: glucose. Long term: fat.
Short term: glucose. Medium term: glycogen. Long term: fat.
8.How does the body react to rapid weight loss?
Hunger decreases and the metabolic rate goes up.
Hunger increases and the metabolic rate goes down.
Hunger increases and the metabolic rate goes up.
Question 9
What would be a typical regulatory system in a metabolic pathway?
The pathway’s product makes it go faster, so that more and more of the product builds up in the cell or body.
The pathway’s product slows it down, so that the product is maintained at a constant level in the cell or organism.
Question 10
Explanation / Answer
The third option is correct which states that genes code for enzymes which regulate metabolic pathways.
Genes are specific segments of DNA that control the various traits of an organism. The expression of genes usually leads to formation of proteins which may be structural or functional in nature.
Metabolism comprises of all the different reactions occurring inside an organism and which are essential for its growth and survival. The metabolic reactions are catalyzed by a type of functional proteins called enzymes. The metabolic pathways are regulated by controlling the production and activity of the enzymes of those pathways.
The structural proteins are mainly involved in providing support and they include collagen, keratin, etc. They are not found to be involved in regulation of metabolism.
DNA is first transcribed to form a molecule of RNA which is then translated to form various structural or functional proteins. Hence, DNA is not found to be directly involved in regulation of metabolism.
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