A&P Test 3

Which of the following is a function of a plasma membrane protein? oxygen transport forms a lipid bilayer molecular transport through the membrane circulating antibody

Which of the following statements is correct regarding RNA? Messenger RNA, transfer RNA, and ribosomal RNA play a role in protein synthesis. There is exactly one specific type of mRNA for each amino acid. If the base sequence of DNA is ATTGCA, the messenger RNA template will be UCCAGU. rRNA is always attached to the rough ER.

Which of the following would not be a constituent of a plasma membrane? phospholipids messenger RNA glycolipids glycoproteins

Mitosis ________. is always a part of the cell cycle is division of the genetic material within the nucleus creates diversity in genetic potential is the formation of sex cells

The electron microscope has revealed that one of the components within the cell consists of pinwheel array of 9 triplets of microtubules arranged to form a hollow tube. This structure is a ________. chromosome centrosome centriole ribosome

Which of these is an inclusion, not an organelle? microtubule melanin cilia lysosome

If the nucleotide or base sequence of the DNA strand used as a template for messenger RNA synthesis is ACGTT, then what would be the sequence of bases in the corresponding mRNA? GUACC UGCAA TGCAA ACGTT

Which transport process is the main mechanism for the movement of most macromolecules by body cells? phagocytosis pinocytosis secondary active transport receptor-mediated endocytosis

Passive membrane transport processes include ________. movement of a substance down its concentration gradient consumption of ATP the use of transport proteins when moving substances from areas of low to high concentration movement of water from an area of high solute concentration to an area of low concentration

Which of the following is NOT a function of the smooth endoplasmic reticulum? protein synthesis in conjunction with ribosomes lipid metabolism and cholesterol synthesis breakdown of stored glycogen to form free glucose steroid-based hormone synthesis

Mitochondria ________. contain digestive enzymes called acid hydrolyses contain some of the DNA and RNA code necessary for their own function synthesize proteins for use outside the cell are single-membrane structures involved in the breakdown of ATP

Peroxisomes ________. are functionally the same as lysosomes function to digest particles ingested by endocytosis are able to detoxify substances by enzymatic action sometimes function as secretory vesicles

Which of the following is NOT a function of lysosomes? breaking down bone to release calcium ions into the blood help in the formation of cell membranes digesting particles taken in by endocytosis degrading worn-out or nonfunctional organelles

In which stage of mitosis do the identical sets of chromosomes uncoil and resume their chromatin form? metaphase telophase anaphase prophase

Which of the following is a principle of the fluid mosaic model of cell membrane structure? Phospholipids form a bilayer that is largely impermeable to water-soluble molecules. All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell. Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains. The lipid bilayer is a solid at body temperature, thus protecting the cell.

Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"? Second messengers act through receptors called K-proteins. Second messengers usually inactivate protein kinase enzymes. Cyclic AMP and calcium may be second messengers. Second messengers usually act to remove nitric oxide (NO) from the cell.

The main component of the cytosol is ________.

In certain kinds of muscle cells, calcium ions are stored in ________. the rough ER the smooth ER the cytoplasm both smooth and rough ER

The functions of centrioles include ________. serving as the site for ribosomal RNA synthesis organizing the mitotic spindle in cell division producing ATP providing a whiplike beating motion to move substances along cell surfaces

Crenation (shrinking) is likely to occur in blood cells immersed in ________. a hypertonic solution a hypotonic solution an isotonic solution blood plasma

If a tRNA had an AGC anticodon, it could attach to a(n) ________ mRNA codon. UCG TCG AUG UGA

The RNA responsible for bringing the amino acids to the ribosome for protein formation is ________. tRNA ssRNA rRNA mRNA

Which of the following would not be restricted (limited) by low levels of ATP? exocytosis phagocytosis pinocytosis osmosis

A cell engulfing a relatively large particle will likely utilize ________. phagocytosis pinocytosis receptor-mediated endocytosis exocytosis

A red blood cell placed in pure water would ________. neither shrink nor swell swell and burst swell initially, then shrink as equilibrium is reached shrink

Myocardium (cardiac muscle tissue) must rhythmically contract for a lifetime. This requires a considerable amount of energy production by the cells. You would expect to see a relatively high amount of which organelle in these cells? cytoskeleton lysosomes mitochondria smooth endoplasmic reticulum

Which of the following describes the plasma membrane? a double layer of protein enclosing the plasma a phospholipid bilayer surrounding the cell a membrane composed of tiny shelves or cristae a single-layered membrane that surrounds the nucleus of the cell

Which of the following structures would aid a cell in allowing more nutrients to be absorbed by the cell? primary cilia stereocilia flagella microvilli

Which of the following statements is correct regarding net diffusion? The greater the concentration gradient, the faster the rate. The lower the temperature, the faster the rate. Molecular weight of a substance does not affect the rate. The rate is independent of temperature.

In a tissue type that undergoes a relatively great deal of mechanical stress, like the tissue that lines the intestine, you would expect to see an abundance of ________ between the individual cells of the tissue. desmosomes tight junctions gap junctions connections