Question

1. what type of mutation causes sickle cell anemia?

• a. deletion
• b. insertion
• c. point mutation
• d. frameshift

1. which molecule carries genetic information from dna to ribosomes?

• a. trna
• b. rrna
• c. mrna
• d. dna

1. which structure is responsible for protein synthesis?

• a. nucleus
• b. ribosome
• c. golgi
• d. lysosome

1. which base is not found in rna?

• a. adenine
• b. cytosine
• c. thymine
• d. uracil

true/false questions (1 point each):
t1. dna contains the sugar ribose.
a. true
b. false
t2. rna uses uracil instead of thymine.
a. true
b. false
t3. transcription occurs in the cytoplasm.

Explanation:

• Question 7: Sickle cell anemia is caused by a point mutation. A single - base substitution in the DNA sequence leads to a change in the amino acid sequence of hemoglobin.
• Question 8: mRNA (messenger RNA) carries genetic information from DNA to ribosomes. tRNA (transfer RNA) is involved in bringing amino acids to the ribosome, rRNA (ribosomal RNA) is part of the ribosome structure, and DNA stores genetic information.
• Question 9: Ribosomes are the sites of protein synthesis. The nucleus contains DNA, the Golgi apparatus modifies and packages proteins, and lysosomes are involved in digestion.
• Question 10: Thymine is not found in RNA. RNA has uracil instead. Adenine, cytosine, and guanine are found in both DNA and RNA (with thymine in DNA and uracil in RNA).
• T1: DNA contains deoxyribose, not ribose. RNA contains ribose.
• T2: RNA uses uracil instead of thymine as one of its nitrogenous bases.
• T3: Transcription occurs in the nucleus (in eukaryotes). Translation (protein synthesis) occurs in the cytoplasm.

Answer:

1. C. Point mutation
2. C. mRNA
3. B. Ribosome
4. C. Thymine

T1. B. False
T2. A. True
T3. B. False