scientists compare the dna of different organisms 1492625

ATI TEAS 7

TEAS 7 science practice

1. Scientists compare the DNA of different organisms to understand evolutionary relationships. What is this type of evidence called?

A. Morphological evidence (comparing body structures)
B. Biochemical evidence (comparing molecules like proteins)
C. Geographic distribution evidence (where organisms live)
D. Genetic evidence (comparing DNA sequences)

Correct answer: D

Rationale: A) Morphological evidence involves comparing body structures of organisms, which can provide information about evolutionary relationships based on physical similarities and differences. However, DNA comparison is a more direct and accurate method for understanding evolutionary relationships. B) Biochemical evidence involves comparing molecules like proteins, which can also provide insights into evolutionary relationships. However, DNA comparison is considered more reliable due to the direct relationship between DNA sequences and genetic information. C) Geographic distribution evidence refers to where organisms live and how their distribution may provide clues about evolutionary history. While this can be informative, it is not as direct or specific as comparing DNA sequences. D) Genetic evidence involves comparing DNA sequences of different organisms to understand their evolutionary relationships. DNA comparison is a powerful tool in evolutionary biology because it provides direct information about genetic similarities and differences, offering precise insights into evolutionary relationships.

2. What is the result of dividing 8 by 4?

A. 2
B. 4
C. 6
D. 8

Correct answer: A

Rationale: To find the result of dividing 8 by 4, we divide 8 by 4, which equals 2. Choice B (4) is incorrect because it is the divisor, not the result of the division. Choice C (6) is incorrect as it is not the correct quotient. Choice D (8) is incorrect as it is the dividend, not the result of the division.

3. Laura was stuck in traffic on her way to a concert and thought she would miss the concert. Which of the following options uses correct grammar to combine the sentences above for clarity?

A. Because Laura was on her way to a concert, she was stuck in traffic and thought she would miss the concert.
B. Laura was on her way to a concert and she thought she would miss the concert. Laura was stuck in traffic.
C. Laura was on her way to a concert, but because she was stuck in traffic, she thought she would miss the concert.
D. Laura thought she would miss the concert because she was on her way to the concert, but was stuck in traffic.

Correct answer: C

Rationale: Option C combines the ideas in a clear and logical manner by explaining that Laura was on her way to a concert, got stuck in traffic, and thought she would miss the concert. This choice maintains the correct sequence of events, highlighting the cause-effect relationship between being stuck in traffic and potentially missing the concert. Choices A, B, and D either disrupt the logical sequence of events or introduce redundancy in the information provided, making them less effective in conveying the intended message.

4. How many kilograms are in 1,500 grams?

A. 0.15 kg
B. 1.5 kg
C. 15 kg
D. 150 kg

Correct answer: B

Rationale: To convert grams to kilograms, you divide by 1,000 since there are 1,000 grams in a kilogram. Therefore, 1,500 grams divided by 1,000 equals 1.5 kilograms, making choice B the correct answer. Choices A, C, and D are incorrect because they do not correctly convert grams to kilograms.

5. Which structure in the skin is responsible for producing hair?

A. Sudoriferous gland
B. Sebaceous gland
C. Melanocyte
D. Hair follicle

Correct answer: D

Rationale: The correct answer is D: Hair follicle. Hair follicles are structures in the skin responsible for producing hair. They are specialized structures that contain the hair root and the bulb, where hair growth originates. Sudoriferous glands produce sweat, sebaceous glands produce sebum, and melanocytes are responsible for producing melanin, the pigment that gives hair and skin their color. Choices A, B, and C are incorrect because sudoriferous glands produce sweat, sebaceous glands produce sebum, and melanocytes produce melanin, respectively, but they are not responsible for producing hair.