Warm up for todayWarm up for today How many times does DNA replicate How many times does DNA replicate

during meiosis? during meiosis? • Once Once • Twice Twice • Three times Three times • Four times Four times

During the process of meiosis DNA During the process of meiosis DNA replicates replicates

• twice and divides once. twice and divides once. • twice and divides twice. twice and divides twice. • once and divides once. once and divides once. • once and divides twice.once and divides twice.

Warm up for todayWarm up for today An offspring of two parents had an extra chromosome in its An offspring of two parents had an extra chromosome in its

karyotype. The most likely cause of this condition would have karyotype. The most likely cause of this condition would have been been

• a point mutation. a point mutation. • translocation. translocation. • nondisjunction. nondisjunction. • a nonsense mutation. a nonsense mutation. • Which statement below correctly describes what happens to Which statement below correctly describes what happens to

DNA during the formation of sex cells? DNA during the formation of sex cells? When DNA replicates, each of the two new DNA When DNA replicates, each of the two new DNA

molecules has one old strand and one new strand. molecules has one old strand and one new strand. As a result of DNA replication, one DNA molecule is As a result of DNA replication, one DNA molecule is

completely new and one remains as the original. completely new and one remains as the original. After the formation of sex cells the DNA molecules are a After the formation of sex cells the DNA molecules are a

mix of old and new strands. mix of old and new strands. Each new sex cell contains a random, but equal amount Each new sex cell contains a random, but equal amount

of the original DNA molecules. of the original DNA molecules.

Warm up for todayWarm up for today Which molecule carries the code for traits of Which molecule carries the code for traits of

most organisms? most organisms? • Ribonucleic acids Ribonucleic acids • Carbohydrates Carbohydrates • Adenosine triphosphate Adenosine triphosphate • Deoxyribonucleic acids Deoxyribonucleic acids

Which statement below best describes the role Which statement below best describes the role of DNA? of DNA?

• It is the main supplier of energy for cells. It is the main supplier of energy for cells. • It is used to store energy in the body. It is used to store energy in the body. • It carries information for building proteins. It carries information for building proteins. • It serves as the memory molecule in brain cells.It serves as the memory molecule in brain cells.

Warm up for todayWarm up for today Use the diagram below to answer the next question.Use the diagram below to answer the next question.

What macromolecule results when these molecules and What macromolecule results when these molecules and other like them are joined together?other like them are joined together?

Carbohydrate Carbohydrate Protein Protein Lipid Lipid Nucleic acid Nucleic acid

Warm up for todayWarm up for today A molecule contains the original directions for A molecule contains the original directions for

the formation of proteins. In which structure the formation of proteins. In which structure would it most likely be found in a cell? would it most likely be found in a cell?

• Ribosome Ribosome • Nucleus Nucleus • Endoplasmic reticulum Endoplasmic reticulum • Golgi apparatus Golgi apparatus

A molecule that consists of two strands running A molecule that consists of two strands running in the opposite direction generally forms a(n) in the opposite direction generally forms a(n)

• antiparrallel double helix. antiparrallel double helix. • parallel double helix. parallel double helix. • twisted ladder shape. twisted ladder shape.

coiled spring-like shape coiled spring-like shape

Warm up for todayWarm up for today DNA is found in all the following cell DNA is found in all the following cell

structures structures EXCEPTEXCEPT the the • nucleus. nucleus. • mitochondria. mitochondria. • chloroplasts chloroplasts • ribosomes. ribosomes.

Which of the following describes the Which of the following describes the normal shape of a DNA molecule? normal shape of a DNA molecule? • It forms a double helix. It forms a double helix. • It consists of a single helix. It consists of a single helix. • It contains two straight strands. It contains two straight strands. • It is formed from a single stand.It is formed from a single stand.