English
Maharashtra State BoardSSC (English Medium) 10th Standard

What are the components of the DNA molecule?

Advertisements
Advertisements

Questions

What are the components of the DNA molecule?

Which are the components of the DNA molecule?

Short Answer
Advertisements

Solution

A DNA molecule is made up of two helical strands consisting of deoxyribose sugar, a phosphate group (derived from phosphoric acid), and pairs of nitrogenous bases. These three together are called a nucleotide.

shaalaa.com
  Is there an error in this question or solution?
Chapter 1: Heredity and Evolution - Intext question [Page 1]

RELATED QUESTIONS

Name the information source for making proteins in the cells.


List any two contrasting characters other than roundness of pea plants that Mendel used in his experiments with pea plants.


A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?


How is the equal genetic contribution of male and female parents ensured in the progeny?


With the help of two suitable examples, explain why certain experiences and traits earned by people during their lifetime are not passed on to their next generations. When can such traits be passed on?


Name the first scientist who studied the inheritance of traits from one generation to the next.


The gene for red hair is recessive to the gene for black hair. What will be the hair colour of a person if he inherits a gene for red hair from his mother and a gene for black hair from his father?


Name the scientist who gave the laws of inheritance.


Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive:  

Yellow seed


A cross between two individuals results in a ratio of 9 : 3 : 3 : 1 for four possible phenotypes of progeny. This is an example of a ______.


In order to ensure that he had pure-breeding plants for his experiments, Mendel :
(a) cross-fertilised each variety with each other
(b) let each variety self fertilise for several generations
(c) removed the female parts of the plants
(d) removed the male parts of the plants.

 

The visible characteristic in an organism is known as ______.


A cross between a tall plant (TT) and short plant (tt) resulted in progeny that were all tall plants because :
(a) tallness is the dominant trait
(b) shortness is the dominant trait
(c) tallness is the recessive trait
(d) height of plant is not governed by gene T or t


Select the statements that describe characteristics of genes :
(i) genes are specific sequences of bases in a DNA molecule.
(ii) a gene does not code for proteins.
(iii) in individuals of a given species, a specific gene is located on a particular chromosome.
(iv) each chromosome has only one gene..


One of the following traits cannot be inherited. This one is:


The farmers have been cultivating a food plant X for over two thousand years and have produced as many as five entirely different looking vegetables A, B, C, D and E from it.
(a) What could the plant X be?
(b) What are A, B, C, D and E?
(c) What is the process of evolution involved in this example known as?


Explain the mechanism of hereditary changes.


A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F2 progeny in which ratio of violet (VV) and white (vv) flowers will be ______.


Mendel crossed pea plants with two pairs of contrasting characters.

RRYY  × 

rryy
Round,  Yellow Wrinkled, Green

He observed 4 types of combinations in F2 generation. Which of the combinations were new? Write the conclusion drawn by this experiment.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×