Question
Which feature is common to both mRNA and DNA?
A Covalent bonds between adjacent nucleotides
B Hydrogen bonds between guanine and cytosine
C Ribose sugar attached to phosphate
D Antiparallel arrangement of polynucleotide strands
Answer/Explanation
Ans: A
Question
Which structure found in eukaryotes has a single membrane?
A. Nucleus
B. Lysosome
C. Chloroplast
D. Mitochondrion
▶️Answer/Explanation
Markscheme
B
Lysosomes are organelles found in eukaryotic cells that contain digestive enzymes enclosed within a single membrane. They are involved in breaking down and digesting cellular waste materials, foreign substances, and cellular debris. The enzymes inside lysosomes are able to break down various biomolecules, including proteins, lipids, carbohydrates, and nucleic acids.