Science Flashcards
Which of the following is the appropriate threshold value for mammalian neurons?
o -80 Mv
o -55 mV
o 0 mV
o +35 mVb
-55mV
In a certain plant, red flowers are dominant over white flowers. A plant heterozygous for red flowers and a plant with white flowers are crossed. Which of the following is the expected proportion of phenotypes in the next generation?
o 2 red, 2 white
o 4 red, 0 white
o 3 red, 1 white
o 1 red, 3 white
2 red 2 white
Which of the following structures is present in both prokarayotic cells?
o Endoplasmic reticulum
o Cell membrane
o Chloroplast
o Golgi apparatus
Cell membrane
Which of the following can lead to a tsunami?
o Sunspot activity
o Lightning strikes
o Flooding
o Earthquakes
Earthquakes
Which of the following are used to determine a person’s DNA sequence?
o Genes
o Blood type
o Hormones
o Enzymes
Genes
Which of the following organic molecules contain both an amine and carboxyl group?
o Lipids
o Chitin
o Cellulose
o Proteins
Proteins
Osteoporosis results from which of the following
o A decline in osteoclast activity while osteoblast activity continues at expected levels
o An increase in osteocyte activity while osteoblast activity continues at expected levels
o A decline in osteoblast activity while osteoblast activity continues at expected levels
o An increase in osteocyte while activity continues at expected levels.
A decline in osteoblast activity while osteoblast activity continues at expected levels
Which of the following is released by one type of immune cell to directly activate type of immune cell?
o Lysozymes
o Perforin
o Cytokines
o Granzymes
Cytokines
The measurement indicated by the line across the centre of the cell is best referred to as which of the following?
o Radius
o Diameter
o Area
o Volume
Diameter
Which of the following properties of water explains its solvent abilities for certain substances?
o High surface tension
o Kinetic energy of liquid water molecules
o Polarity of water molecules
o High specific heat
Polarity of water molecules
Which of the following vessels caries oxygenated blood?
o Pulmonary vein
o Inferior vena cava
o Pulmonary artery
o Superior vena cave
Pulmonary vein
Which of the following is a mass with the ovary that secretes hormones to maintain the uterine lining during pregnancy?
o Umbilical cord
o Corpus luteum
o Oocyte
o Oviduct
Corpus luteum
To separate genomic DNA fragments by size, which of these laboratory methods is most useful?
o Spectrophotometry
o Electrophoresis
o Filtration
o Titration
Electrophoresis
In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?
o ff x ff
o Ff x Ff
o FF x FF
o Ff x ff
ff x ff
Which of the following physiological responses is caused by the release of anti-diuretic hormones?
o Decrease in water reabsorption in the collecting duct
o Decrease in the concentration of calcium in the glomerulus
o Increase in water reabsorption in the collecting duct
o Increase I the concentration of calcium in the glomerulus
Increase in water reabsorption in the collecting duct
Which of the following is the atomic number that has 12 protons and 12 neotrons
o 12
o 24
o 1
o 144
24
Which of the following glands synthesizes antidiuretic hormone?
o Pineal gland
o Hypothalamus
o Thymus
o Pancreas
Hypothalamus
Which of the following is the process in which an ovarian follicle matures and releases a reproductive egg?
o Menstruation
o Ovulation
o Fertilization
o Oogenesis
Ovulation
Which of the following reasons explains why it is important for new scientific findings to be published?
o Publishing findings will help scientists become more biased
o Other scientists can validate or disapprove the findings
o Scientists will get paid if their findings are published
o This prevents other scientist from performing similar tests.
Other scientists can validate or disapprove the findings
Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?
o Carbon dioxide
o Carbon monoxide
o Oxygen
o Carbonic acid
Carbonic acid
Which of the following is the structure through which blood exits the glomerulus?
o Proximal tubule
o Distal tubule
o Afferent arteriole
o Efferent arteriole
Efferent arteriole
Which of the following is the function of totipotent cell?
o Carries electrical impulses
o Fights infectious diseases
o Aids the maturation of sex cells
o Develops into any kind of cell
Develops into any kind of cell
Which of the following statements best supports the hypothesis that viruses can cause cancer?
o Genes that regulate cell division are found in some viruses
o Viruses and cancer cells both replicate rapidly
o Cancerous and normal cells share genetic sequences
o Cellular DNA has sequences related to viral sequences
Genes that regulate cell division are found in some viruses
In a phase diagram, which of the following is the term used for a substance held at temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously?
o Critical point
o Triple point
o Critical temperature
o Absolute zero
Triple point
Which of the following microorganisms lack their own metabolic pathways and can reproduce inside a host cell?
o Protozoa
o Helminths
o Viruses
o Bacteria
Viruses
If a portion of a strand of DNA bases reads 5’ AGCTAGCGT 3’, what would the sequence of bases on the complementary stand read?
o 3’ AGCTSGCGT 5’
o 5’ UCGAUCGCA 3’
o 5’ TCGUTCGCU 3’
o 3’ TCGATCGCA 5’
3’ TCGATCGCA 5’
. In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure the liquid and gaseous phases of a substance merge together into a single phase?
o Critical point
o Triple point
o Critical temperature
o Absolute zero
Critical point
Which of the following indicates the function of sodium bicarbonate released by the pancreas?
o Sodium bicarbonate stimulates the pyloric sphincter
o Sodium bicarbonate is a protease that digests carbohydrates
o Sodium bicarbonate neutralizes the acidity of chime
o Sodium bicarbonate inhibits peristalsis
Sodium bicarbonate neutralizes the acidity of chime
Which of the following types of cells produce and release antibodies?
o Natural killer cells
o Helper T-cells
o Cytotoxic cells
o Plasma B cells
Plasma B cells
The cytoskeleton of a cell is comprised of which of the following macromolecules?
o Proteins
o Carbohydrates
o Nuclear acids
o Lipids
Proteins
Which of the following summarizes a change that takes place as a solid turns into a liquid?
o Intermolecular forces between particles become stronger
o Particles move closer together
o Particles become less ordered
o Particles have a decrease in mobility
Particles become less ordered
Which of the following are specific immune response (select all that apply)?
o T lymphocyte activation and clonal expansion
o Antibody production
o The formation of memory B cells
o Complement proteins binding to and destroying bacteria
o Endocytosis of a virus by a phagocytic lymphocyte
The formation of memory B cells
T lymphocyte activation and clonal expansion
Complement proteins binding to and destroying bacteria
Which of the following is the main function of centrosomes in animal cells?
o Pathogen digestion
o Organelle trafficking
o Microtubule organization
o Cytoplasm
Microtubule organization
Testosterone is categorized as which of the following types of hormone?
o Aldosterone
o Progestin
o Androgen
o Estrogen
Androgen
Which of the following are the two major parts of the nervous system?
o Autonomic nervous system and somatic nervous system
o Peripheral nervous system and somatic nervous system
o Autonomic nervous system and central nervous system
o Peripheral nervous system and central nervous system
Peripheral nervous system and central nervous system
Hiker who found a human body at high altitude in the Italian Alps thought the man had died recently, but tests indicate that he was shot with an arrow more than 5,000 years ago. Which of the following would be the best reason for prolonged preservation of the body?
o The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found
o The food that the person ate contained toxins that killed the bacteria that would otherwise destroyed the body
o The arrow wound caused blood to flow out of the body, which led enzymes that would break down tissue to be cleared from the body
o The ultraviolet rays at such a high altitude caused all the body’s molecules to be preserved.
The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found