10A IB Biology Past Paper 2024-2025 PDF

### In liquid form, water molecules interact with other water molecules by way of which of the following? A. Hydrogen bonds B. Peptide bonds C. Ionic bonds D. Covalent bonds 2. Adhesion of water molecules best explains which of the following? A. Surface tension B. Capillary action of w...

### In liquid form, water molecules interact with other water molecules by way of which of the following? A. Hydrogen bonds B. Peptide bonds C. Ionic bonds D. Covalent bonds 2. Adhesion of water molecules best explains which of the following? A. Surface tension B. Capillary action of water within soil C. High boiling point of water D. Solubility of polar solutes 3- Which pair of terms best describe water as a solvent? A. Hydrophobic/nonpolar B. Hydrophilic/polar C. Hydrophobic/ polar D. Hydrophilic/nonpolar 4- The stream-lined body shape of the black-throated loon (*Gavia arctica*) has evolved in order to help overcome which of the following? Relatively high buoyancy of water as compared to air A. Relatively high buoyancy of air compared to water B. Relatively high viscosity of air compared to water C. Relatively high viscosity of water as compared to air 5- The figure shows a single nucleotide. What does the circle represent?  A. Any RNA nitrogenous bases B. Any DNA nitrogenous bases C. A phosphate group D. A five carbon sugar 6- The figure shows a single nucleotide. What does the pentagon represent? https://www.pearsonactivelearn.com/r01/r0113/r011379/r01137941/current/static/media/images/mediauntitled1692331350.png A. Glucose B. Deoxyribose C. Lactose D. Ribose 7- Identify the molecule that is not a nucleic acid: A. RNA B. ATP C. DNA D. GLY 8- In a DNA molecule, what is the nitrogenous base that is complementary to Adenine? A. Uracil B. Cytosine C. Thymine D. Guanine 9- Complementary base pairs of DNA are held together by which of the following? A. Covalent bonds between nitrogenous bases of two antiparallel strands B. Covalent bonds between nitrogenous within a single strands C. Hydrogen bonds between nitrogenous bases of two antiparallel strands D. Hydrogen bonds between nitrogenous within a single strands 10- The universal common ancestry of all living organisms is best reinforced by which of the following concepts? A. All living organisms use the same genetic code. B. All living organisms are made of cells. C. All living organisms contain DNA D. Living organisms continue to evolve. 11- Which of the following is a development in electron microscopy? A. Freeze fracture techniques B. Fluorescent stain usage C. Immunofluorescent D. Measurements using an eyepiece graticule 12- Which of the following organelles would not be present in most animal cells? A. Golgi apparatus B. Chloroplasts C. Vacuoles D. Mitochondria 13- Which of the following is considered an example of discontinuous variation in humans? A. Body mass B. Height C. Skin color D. Blood type 14- A biologist finds a reproductive cell in an organism and counts the number of chromosomes.\ There are half the number typically found in the organism.\ Which word best describes the cell in terms of the number of chromosomes she sees? A. Diploid B. Haploid C. Helical D. Triploid 15- According to the biological species concept, what would be true about *Canis lupus and Canis familiaris*? A. They have different morphologies and any resemblance would be due to convergent B. They would not be able to produce hybrids together C. They would not be able to produce fertile offspring together D. They belong to the same species. 16- Place the choices into the correct place according to the type of cell. ( 5 marks) prokaryotic cell: eukaryotic cell A. 70S ribosomes B. Nucleus containing chromosomes made of DNA bound to histones 17 - Complete the sentence by filling in the blank. (5 marks) a. **nuclei b) cells c) neutrons** Numbers of ............... are often used to illustrate atypical cell structure in fungal hyphae and skeletal muscle. 18- Complete the sentence by filling in the blank. (5 marks) **a) clades b) branches c) species** Instead of using a purely morphological classification as Linaeus did, it is possible to put organisms together into categories called ........... that show common characteristics as well as common ancestries.