HESI A2 Biology Multiple Choice Questions with Verified Solutions

HESI A2 Biology Multiple Choice Questions with Verified Solutions which of the following properties of water causes water droplets to form beads on surfaces, such as on a leaf? a) adhesion b) specific heat c) surface tension d) ability to dissolve substances - Correct Answer ️️ -c) surface tension: pulls together the molecules on the surface of water, forcing them to form a sphere, or bead which of the following polymers is created by joining amino acids? a) DNA b) lipid c) protein d) carbohydrate - Correct Answer ️️ -c) proteins: are built by joining amino acids which of the following nucleotides is NOT found in DNA? a) adenine b) uracil c) thymine d) cytosine - Correct Answer ️️ -b) uracil: a nucleotide found in RNA, not DNA which of the following compounds is NOT created by joining monosaccharides? a) glycogen b) starch c) cellulose d) guanine - Correct Answer ️️ -d) guanine: a nucleic acid, not a polysaccharide the Golgi apparatus is responsible for which of the following tasks? a) protein synthesis b) intracellular and extracellular transport c) storage and replication of DNA d) production of ATP - Correct Answer ️️ -b) intracellular and extracellular transport: the Golgi apparatus packages and transports proteins produced on the endoplasmic reticulum which of the following structures is embedded in the cell membrane to facilitate the movement of molecules across the membrane? a) proteins b) ATP c) glucose d) lipids - Correct Answer ️️ -a) proteins: embedded in the cell membrane are integral to many cell functions, including active transport and some types of passive transport a student places a cell with 50 mM intracellular ion content into a solution containing a 20 mM ion content. which of the following will happen in this system? a) water will move out of the cell, decreasing the size of the cell b) water will move into the cell, increasing the size of the cell c) ions will move into the cell d) there will be no movement of water or ions across the cell membrane - Correct Answer ️️ -b) water will move into the cell, increasing the size of the cell: the concentration of ions is higher inside the cell than outside, so water will move into the cell from the environment, increasing the size of the cell which of the following substances cannot travel across a cell membrane without the use of energy? a) water b) potassium c) sodium d) glucose - Correct Answer ️️ -d) glucose: a glucose molecule is too large to pass through the cell membrane without the help of specialized proteins all of the following molecules are used in the Calvin Cycle EXCEPT a) O2 b) CO2 c) ATP d) NADPH - Correct Answer ️️ -a) O2: is released during the light-dependent stage of photosynthesis and is not used during the Calvin Cycle. the other choices are used during the Calvin Cycle to produce glucose which of the following stages of cellular respiration produces the largest number of ATP molecules? a) glycolysis b) fermentation c) Krebs cycle d) electron transport chain - Correct Answer ️️ -d) ETC: produces 30-32 molecules of of ATP made during cellular respiration. the other choices each produce only two molecules of ATP a scientist takes DNA samples from a cell culture at two different times, each same having the same cell count. in the first sample, he finds that there is a 6.5 pg of DNA whereas in the second sample, he finds that there is a 13 pg of DNA. which state of the cell cycle is the first sample in? a) interphase G1 b) interphase S c) interphase G2 d) mitotic phase - Correct Answer ️️ -a) interphase G1: during the G1 phase of interphase, the cell has not replicated its DNA, doubling the amount of DNA in the cell at the end of which phase of mitosis are chromosomes first clearly visible under the light microscope? a) interphase b) prophase c) metaphase d) anaphase - Correct Answer ️️ -b) prophase: during prophase, the DNA replicated during interphase condenses into chromosomes, which are clearly visible under a light microscope which of the following describes why small sections of DNA are lost during replication? a) the sections of DNA between Okazaki fragments cannot be recovered b) DNA polymerase cannot replicate the end of the DNA strand c) DNA cannot be read in the 5' to 3' direction d) the initiator proteins bind only one strand of DNA - Correct Answer ️️ -b) DNA