1. If we\'re not growing, why do we need to eat food? The best answer is: The se
ID: 3511750 • Letter: 1
Question
1. If we're not growing, why do we need to eat food? The best answer is:
The second law of thermodynamics
The third law of thermodynamics Newton's first law Newton's third law
The first law of thermodynamics
Newton's second law
2. Phenylketonuria (PKU) is a genetic disorder caused by a deficit in an enzyme that converts the amino acid phenylalanine to tyrosine (Enz1 in the diagram below). One of the abnormalities of PKU is a buildup of phenylpyruvic acid, a product of Enz2 in the diagram below. What is the likely explanation for this buildup of phenylpyruvic acid, considering that Enz2 is completely normal? tyrosine <----Enz1--- phenylalanine ---Enz2----> phenylpyruvic acid
the law of use and disuse
the second law of thermodynamics
the law of independent assortment
the first law of thermodynamics
the law of mass action
3. The membranes of cells contain ______
lipids
proteins
carbohydrates
DNA
RNA
4. Which of these words could characterize a region of chromatin that is capable of active gene expression? condensed acetylated extended heterochromatic euchromatic open 5. Which of these atoms are capable of forming double bonds with another atom?
H
C
O
P
Explanation / Answer
Ans 1: The best answer is: Second law of thermodynamics.
Ans 2: The choice is : The law of independent assortment which is Mendels law. The trait of PKU would have come from one of the parents. Its a genetic disorder.
Ans 3: The membranes of cells contain LIPIDS & PROTEINS.
The cell membrane is composed of lipid bilayer with embedded protein.
Ans 4: The words, condensed, acetylated, open, heterochromatic are the words which characterize a region of chromatin which is capable of active gene expression.
For gene expression to happen there has to be rearrangement of chromatin from a CONDENSED state to a more accessible state. ACETYLATION of histones Increases gene expression. The chromatin must OPEN for gene expression to start and this process of opening is called as chromatin remodeling. HETEROCHROMATIC is of two types constitutive and facultative and both are important for gene expression.
Ans 5: Carbon(C) and Oxygen(O) are capable of forming double bonds with another atom. Carbon forms double bond with hydrogen to form alkenes (example: C2H4--Ethene), Oxygen forms double bond by sharing its two pairs of electrons with Carbon for example in CO2(Carbon dioxide).
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