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DNA, Genetics And Evolution (5)

Test Description: DNA, Genetics and Evolution -Middle School - Life Science

Instructions: Answer all questions to get your test result.

1) DNA is sometimes referred to as a ladder. Which two molecules make up the sides of the DNA ladder? (sugar usually ends in ose)

Aphosphate and ribose Bphosphate and deoxyribose Cnitrogen base and ribose Dphosphate and nitrogen base

2) What is NOT an example of DNA technology currently used in agriculture?

AThe cloning of human nerve cells from corn plants BThe use of growth hormones produced from recombinant bacteria to increase milk production CThe development of pesticide resistant crop plants DThe development of frost resistant crop plants

3) How many chromosomes are normally found in a human sex cell?

A48 B2000 C23 D46

4) In Deoxyribonucleic acid, Adenine pairs with the nitrogen base -

Aadenine Bcytosine Cguanine Dthymine

5) Which would NOT represent an inherited trait?

ADimples BPopping your knuckles CCurly hair DBlue eyes

6) What is an organism called that has two different genes for a trait? (examples: Tt or Rr)

AA mutation BA purebred or homozygous CA hybrid or heterozygous DAn endangered species

7) Scientists have genetically engineered certain crops to be resistant to the harmful effects of pesticides. What is one advantage of this modification?

AThe farmer will produce crops that could be potentially harmful to human consumption. BThe crops could potentially pass this modification onto the pest, which would allow the pest to eat the crops. CThe farmer will not kill his crops when defending them against a pest. DThe crops could have slower growing rates because of their modified genes.

8) What is NOT a principle of genetics?

AGenes are usually dominant or recessive. BRecessive traits always show up in the offspring. CTraits are passed from parents to offspring. DTraits are determined by gene pairs.

9) What do we call the trait that hides or masks another trait?

AA recessive trait BIncomplete dominance CDNA replication DA dominant trait

10) If the tall trait is dominant over the short trait, which would be used to represent the dominant trait?

As BS CT Dt

*select an answer for all questions

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