
3A: DNA & Genes
Presentation
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Science
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7th Grade
•
Practice Problem
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Medium
Brooklyne Sandoval
Used 83+ times
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8 Slides • 6 Questions
1
3A
DNA & GENES
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The Need for Information
Cells need information in order to live, grow, and reproduce.
DNA is a kind of nucleic acid that stores the information needed to make all of the complex cellular machinery.
A DNA molecule looks like a twisted ladder.
3
Multiple Choice
The shape of a DNA molecule can be described as a ________.
loop-de-loop
sea star
trapeze swing
twisted ladder
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5
Nucleotides
The sides of the ladder are made of phosphates and a sugar known as deoxyribose.
The smaller subunits are called nucleotides. Each nucleotide consists of a sugar, a phosphate, and a base.
6
Multiple Select
Each nucleotide is made up of three parts: a sugar, a phosphate, and a base. True or false?
True
False
7
The bases come in pairs:
Guanine is always paired with cytosine.
Adenine is always paired with thymine.
8
Fill in the Blanks
Type answer...
9
Multiple Choice
In DNA molecule, adenine always pairs with _________.
cystosine
guanine
thymine
uracil
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11
Gene
a section of a DNA molecule that codes for a unique protein/trait.
12
Multiple Select
A chromosome is a section of DNA that codes for a unique protein. True or false?
True
False
13
The Hidden Meaning of DNA
Different nucleotides are arranged in differing orders to convey the information that cells need to build proteins.
Which protein gets built depends on which nucleotides are present in the gene and what order they’re in.
14
Multiple Select
Changing the order of the nucleotides in DNA leaves the protein that is built unaffected as long as the same nucleotides are present. True or false?
True
False
3A
DNA & GENES
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