Biological Processes Flashcards
Which of the following would not occur during sympathetic stimulation? A. secretion of glucagon B. dilation of bronchioles C. dilation of intestinal blood vessels D. dilation of pupils
C. Dilation of intestinal blood vessels increases under parasympathetic stimulation
Which of the following would increase the pH of blood? A. severe damage to the kidneys B. digestion of a big meal C. increase in anaerobic respiration D. increase of the blood pCO2
B. During digestion, parietal cells in the stomach generate HCl in exchange for bicarbonate which enters the blood plasma, increasing pH
Which of the following yields the least ATP directly? A. TCA cycle B. oxidative phosphorylation C. glycolysis D. beta oxidation
A. TCA yields 2 GTPs which can be converted into ATP, oxidative phosphorylation yields 32-24 ATP, glycolysis yields 2 ATP, beta oxidation yields over 100 ATP
The T-tubules transmit an action potential, causing the opening of \_\_\_\_\_\_ channels in the \_\_\_\_\_. A. Na+, sarcoplasm B. Ca2+, sarcoplasmic reticulum C. Na+, sarcoplasmic reticulum D. Ca2+, sarcoplasm
B. The T-tubules conduct action potentials that cause channels to open on the surface of the sarcoplasmic reticulum. The opening of these channels results in a release of Ca2+ into muscle fibers
Which of the following decompose disaccharides into monosaccharides? A. salivary amalyse B. pancreatic enzymes C. gastrin D. brush border enzymes
D. Disaccharides such as sucrose, maltose, and lactose are broken down further in the small intestine by way of brush border enzymes
Which of the following does hemoglobin bond most strongly with? A. oxygen B. carbon dioxide C. carbon monoxide D. hydrogen
C. the iron in hemoglobin forms the strongest bond to carbon monoxide because of donating additional electrons
Which of the following is not secreted by the hypothalamus? A. glucocorticoids B. GnRH C. dopamine D. GHIH
A. Glucocorticoids are steroids synthesized and secreted by the adrenal cortex
A virtual phage is one which infects via: A. lysogenic cycle B. phagocytosis C. immunoglobins D. lytic cycle
D. The lytic cycle is the process by which a phage DNA replicates itself via the host cell before causing the cell to lyse and release of the phage’s replications
Which is not a function of immunoglobins? A. coagulation B. assist in phagocytosis C. attack pathogens D. labeling of pathogens
C. Antibodies (immunoglobins) perform all of the functions except for directly attacking pathogens. Leukocytes (white blood cells) are responsible for attacking pathogens
What results in extra or fewer chromosomes in a cell? A. nondisjunction B. double replication C. double cytokinesis D. epistasis
A. Nondisjunction is when chromosomes do NOT separate during anaphase. Consequently, the resulting cells display an unequal sharing of chromosomes, with some cells having too many and others having too few
For vision, \_\_\_\_\_\_\_ must be converted to \_\_\_\_\_\_ in the cells of the retina. A. vitamin C, retinal B. vitamin E, biotin C. vitamin A, retinal D. vitamin A, biotin
C. Vitamin A is a precursor of retinal, which is the chemical compound that enables animals to see. Biotin is associated with vitamin B
Which of the following is involved in hearing? A. microvilli B. cilia C. hair follicles D. hair cells
D. Hair cells lining the basilar membrane utilize mechanotransduction to detect, amplify, and convert mechanical sound waves into electrical signals. These signals pass through the cochlear nerve to the brain
Which is not active in bone resorption? A. osteoblasts B. osteoclasts C. nephrons D. small intestine
A. Bone resorption, the decomposition of bone for absorption of minerals, including calcium, directly involves osteoclasts. Nephrons and the small intestine both absorb released Ca2+. Osteoblasts function to construct, not decompose, bones.
Which of the following will result if there is a drop in the blood pressure? A. formation of glucose B. secretion of insulin C. secretion of EPO D. secretion of ANP
C. A drop in BP causes the renal cortex of the kidney to secrete EPO in an effort to increase BP by increasing synthesis of red blood cells.
Which of the following occurs as a rise in intraocular pressure? A. inflammation of the cornea B. glaucoma C. cataract D. diabetic retinopathy
B. IOP poses the greatest risk of causing glaucoma. A reduction in the flow and drainage of aqueous humor leads to a rise in IOP. The built up pressure eventually causes glaucoma and optic nerve damage.
In which nonmembranous compartment are ribosomes made in a eukaryotic cell? A. nucleus B. rough ER C. nucleolus D. cytoplasm
C. Ribosomes are manufactured inside of the nucleolus. RNA polymerases I and III work together to create ribosomes from rRNA and proteins
Which of the following lists the correct taxonomic order from most inclusive to least inclusive? A. kingdom, order, class, species B. order, family, genus, phylum C. order, family, genus, species D. phylum, order, species, genus
C. Kingdom, phylum, class, order, family, genus, species
Which of the following corresponds to the coding strand of the following mRNA? 5'-GUAACGUACA-3' A. 5'-GTAACGTCA-3' B. 5'-CATTGCAGT-3' C. 5'-ACUGCAAUG-3' D.5'-TGACGTTAC-3'
A. The coding strand is NOT the complementary strand; it is the strand of DNA which is complementary to the strand from which mRNA is made. The coding strand will have the same sequence of bases as the produced RNA transcript except with thymine instead of uracil.
5 nucleotide bases
guanine cytosine adenine thymine uracil
Which cells make up the insulated wrapping on axons? A. Schwann cells B. astrocytes C. microglia D. macrocytes
A. Axons are surrounded by insulating cells called Schwann cells. This insulation enables action potentials to travel rapidly throughout the nervous system
Which of the following statements regarding energy production is true?
A. There is a net total of 4 ATP produced in glycolysis
B. The GTP made in the TCA cycle does not become ATP
C. The cell requires energy to move NADH into the mitochondria
D. The net gain of ATP from each NADH is 2
C. Transport of the NADH into the mitochondria in most cases requires 1 ATP. This is the reason that prokaryotes often have a higher yield of ATP per glucose when compared to eukaryotes. Usually 38 ATP are produced per glucose for prokaryotes, and 36 per glucose for eukaryotes
Blood flows from the mitral valve to the \_\_\_\_\_. A. left atrium B. aorta C. right ventricle D. left ventricle
D. The left atrium connects to the left ventricle by way of the mitral valve. The left ventricle connects to the aorta by way of the aortic valve. Blood flows from the pulmonary veins into the left atrium through the mitral valve (bicuspid valve) to the left ventricle.
A female who is a carrier of an X-linked recessive disability produces an offspring with a normal male. What is the chance a male offspring will have the disability? A. 0% B. 25% C. 50% D. 100%
C. The situation represent is an Xx female crossed with an XY male. Because the offspring is male XY, the X-chromosome must come from the mother. Consequently, there is a 50% chance of receiving the recessive x-chromosome.
Energy for ATP synthesis is produced primarily by \_\_\_\_\_\_. A. NADH B. proton gradient C. ATP synthase D. Na+
B. Proton pumps located along the inner mitochondrial membrane enable the passage of H+ across a concentration gradient. These protons pass through ATP synthase in which an axel rotates to combine phosphate with ADP to form ATP. Without the proton gradient, ATP synthase could not create ATP.