36-39 36. Which is/are true of DNA? a. it makes up 60% of a chromosome b. it is
ID: 225230 • Letter: 3
Question
36-39
36. Which is/are true of DNA?
a. it makes up 60% of a chromosome
b. it is positively charged
c. It wraps around protein
d. B and C
e. All of the above
37. Which is/ are true of protein in a chromosome?
a. it makes up 60% of a chromosome
b. it is positively charged
c. It stores generic information
d. A and B
e. All of the above
38. Which is matt exhibited by cancer cells? Density dependent inhibition Anchorage dependence Cl Both of these are exhibited by cancer cells D) Neither of these ane exhibited by cancer cells 39 P680 accepts an electron from AN barf complex B) nitrogen two photons oflight D) water E ATPExplanation / Answer
36.c it wraps around protein to chromosomes.
Chromatin consists of DNA and proteins. The protein that is coiled around the DNA in chromatin is called histone.When the chromatin condenses,it is referred to as chromosomes.The proteins help package the DNA into the units known as chromosomes.Histone acts as a spool to which DNA can wrap itself around which helps condense the DNA.
DNA is negatively charged because of the negatively charged phosphate group in its structure.
37.it is positively charged.
DNA being negatively charged is held with some proteins which have positive charges in a region termed as nucleoid.The DNA in nucleotide is organized in large loops held by proteins.There is a set of positively charged,basic proteins known as histones.A protein acquires charge depending upon the abundance of amino acids residues with charged side chains. DNA consists of genetic information.
38.option d
Cancer cells don't exhibit either density dependent inhibition or anchorage dependency.
Anchorage dependency:normal cells must be attached to a substratum like the extracellular matrix of a tissue to divide;prevent cells from dividing and floating off in the body.
Density dependent inhibition:the process where crowded cells stop dividing;the number of cells in a area force competition for nutrients,space,and growthe factors,so when cells are crowded, they get signals to stop dividing.
39.option d water
Once an electron is lost,each photosystem is replenished by electrons from a different source. The P680 reaction center gets electrons from water.When light is absorbed by one of the many pigments in P680 energy is passed inward from pigment to pigment until it reaches the reaction center.There,energy is transferred to P680,boosting an electron to a high energy level.The high-energy electron is passed to an acceptor molecule and replaced with an electron from water.This splitting of water releases the oxygen which we breathe.
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