Question

heredity & dna

1. arrange the following structures from largest to smallest.

• a chromosome
• a nucleus
• a gene

largest _______________
_______________
smallest _______________

1. the diagram below represents a portion of a molecule found in cells of the human body.

diagram of a dna - like structure with base pairs g - c, c - g, t - a, a - t, a - t
a. what is the name of this molecule? _________________________
b. what is the function of this molecule? _____________________
_____________________________________________________
c. what do the different letters represent? ____________________
d. why is the sequence of these letters so important? __________
_____________________________________________________

1. which nuclear process is represented below? ___________________

a dna molecule untwists. → the two strands of dna separate. → molecular bases pair up. → two identical dna molecules are produced.

Explanation:

Question 1

Step1: Recall the size hierarchy of genetic structures. The nucleus is a cellular organelle that contains chromosomes. Chromosomes are made of DNA and proteins, and genes are segments of DNA on chromosomes.

So the order from largest to smallest is nucleus, chromosome, gene.

The molecule has a double - helix structure (implied by the diagram) with base pairs G - C, C - G, T - A, A - T, A - T. These are the characteristic features of DNA (Deoxyribonucleic Acid).

DNA's main function is to store and transmit genetic information. It contains the instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.

Answer:

Largest: a nucleus
Middle: a chromosome
Smallest: a gene

Question 2

Part a