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Here's the text from the image, formatted in markdown: ## Genetics Review (Unit 4) - Answers.pdf **Choose the best answer for each question.** 1. Chromosomes are structures that carry the code for inherited traits in the form of: * a. enzymes * **b. genes** * c. hybrids *...

Here's the text from the image, formatted in markdown: ## Genetics Review (Unit 4) - Answers.pdf **Choose the best answer for each question.** 1. Chromosomes are structures that carry the code for inherited traits in the form of: * a. enzymes * **b. genes** * c. hybrids * d. phenotypes 2. Which nucleic acid is found only in the cell nucleus? * **a. DNA** * b. mRNA * c. rRNA * d. tRNA 3. Which nucleic acid determines the physical characteristics and chemical makeup of an organism? * **a. DNA** * b. mRNA * c. mRNA * d. amino acids 4. Watson and Crick described the DNA molecule as a: * **a. double helix** * b. nucleotide * c. single helix * d. phosphate 5. Within a molecule of DNA, adenine binds only to: * a. adenine * b. cytosine * c. guanine * **d. thymine** 6. A weak hydrogen bond in a DNA molecule occurs between: * a. a base and a phosphate * b. a base and a sugar * c. a sugar and a phosphate * **d. the two bases** 7. Which substance is not found in RNA? * a. adenine * b. cytosine * **c. thymine** * d. uracil 8. Where can mRNA be found in the cell? * a. in neither the nucleus or cytoplasm * b. only in the nucleus * **c. in both the nucleus and cytoplasm** * d. only in the cytoplasm 9. Which substance is not found in DNA? * a. adenine * b. cytosine * c. thymine * **d. uracil** 10. How many kinds of proteins exist in a cell? * a. two * b. three * c. twenty * **d. thousands**