- Which of the following molecules is stored in the liver and broken down when the body needs energy?
- What type of molecule is hemoglobin?
- a steroid
- a protein
- a nucleic acid
- a carbohydrate
- A person’s blood pressure reading is measured at 150/80. Which of the following is greater than normal?
- systolic pressure
- diameter of veins
- diastolic pressure
- capillary diameter
- Rings of cartilage surround which of the following structures?
- the alveoli
- the bronchi
- the pharynx
- the bronchioles
- What structure is lined with cilia?
- the trachea
- the pharynx
- the epiglottis
- the pleural membranes
- What structures increase the surface area in the lungs?
- the villi
- the alveoli
- the bronchi
- the pleural membranes
- Which of the following causes a drop in the air pressure within the thoracic cavity?
- The rib cage moves up and out.
- Air moves into the thoracic cavity.
- The diaphragm becomes dome shaped.
- The medulla oblongata sends fewer nerve impulses.
- Which of the following conditions results in fewer hydrogen ions being excreted into the urine?
- increased blood pH
- decreased blood pH
- secretion of aldosterone
- secretion of antidiuretic hormone (ADH)
- Fertilization usually takes place in the
- Which phase occurs on days 15–28 of the uterine cycle?
- the luteal phase
- the follicular phase
- the secretory phase
- the proliferative phase
- The quaternary structure of a protein is
- a helix.
- a pleated sheet.
- joined polypeptides.
- a linear sequence of amino acids.
- Which of the following is not a characteristic of DNA?
- The strands form a double helix.
- The adenine bonds with thymine.
- The strands are held together by ionic bonds.
- The backbone consists of sugar and phosphate
- At which of the following does transcription occur?
- the vacuoles
- the ribosomes
- the Golgi bodies
- the chromosomes
- Transcription and translation both result in molecules which
- contain deoxyribose.
- contain nitrogen atoms.
- have a tertiary structure.
- are produced in the cytoplasm
- Mutations may be defined as changes in the
- arrangement of amino acids in nucleic acids.
- sequence of nitrogenous bases in nucleic acids.
- bonding occurring between bases in nucleic acids.
- structure of the DNA sugar-phosphate backbones
- Oxygen moves through a cell membrane by
- active transport.
- facilitated transport
- Which of the following describes a coenzyme?
- a protein molecule that speeds up a reaction
- a metal ion that binds to the enzyme changing its shape
- a substance that aids an organic catalyst by donating atoms
- a substrate that joins with an enzyme to form an enzyme-substrate complex
- Which of the following produces a hormone that increases the rate of the chemical reactions that occur in all body cells?
- the testes
- the thyroid gland
- the adrenal gland
- the pituitary gland
- Which of the following absorb glucose?
- Which of the following is a function of a vein?
- to carry oxygenated blood away from the lungs
- to carry oxygenated blood from the heart to the stomach
- to carry deoxygenated blood away from the right atrium
- to carry deoxygenated blood from the iliac artery to the leg
- Which of the following organs produces urea?
- the liver
- the kidney
- the stomach
- the small intestine
- What blood vessels carry blood to and from the intestines?
- the iliac artery and the iliac vein
- the carotid artery and the jugular vein
- the hepatic portal vein and the hepatic vein
- the mesenteric artery and the hepatic portal vein
- What blood vessel carries blood from the fetus to the placenta?
- arterial duct
- umbilical vein
- umbilical artery
- posterior vena cava
- Which of the following engulf disease-causing bacteria?
- the platelets
- the bone marrow
- the red blood cells
- the white blood cells
- Between which of the following does external respiration occur?
- the alveoli and the lung capillaries
- the tissue fluid and the tissue cells
- the mitochondria and the cytoplasm
- the tissue capillaries and the tissue fluid
- Most of the carbon dioxide produced during exercise returns to the lungs as
- bicarbonate ions.
- reduced hemoglobin.
- dissolved carbon dioxide.
- What two substances combine in the blood resulting in a decrease in pH?
- oxygen and hemoglobin
- carbon dioxide and water
- hemoglobin and fibrinogen
- carbonic anhydrase and carbon dioxide
- Stimulation of which of the following causes the pupils to dilate?
- the central nervous system
- the somatic nervous system
- the sympathetic nervous system
- the parasympathetic nervous system
- Which of the following results from increased aldosterone secretion?
- increased blood volume and increased urine production
- increased blood volume and decreased urine production
- decreased blood volume and increased urine production
- decreased blood volume and decreased urine production
- Parthenocarpic tomato fruits can be produced by
(a) removing androecium of flowers before pollen grains are released
(b) treating the plants with low concentrations of gibberellic acid and auxins
(c) raising the plants from vernalized seeds
(d) treating the plants with phenyl mercuric acetate
- What type of placentation is seen in sweet pea?
(a) Basal (b) Axile
(c) Free central (d) Marginal
- In a cereal grain the single cotyledon of embryo is represented by
(a) coleorhiza (b) scutellum
(c) Aleurone layer (d) coleoptile
- Male gametes in angiosperms are formed by the division of
(a) microspore (b) generative cell
(c) vegetative cell (d) microspore mother cell
- Which one of the following is surrounded by callose wall ?
(a) Microspore mother cell (b) Male gamete
(c) Egg (d) Pollen grain
- Phototropic and geotropic movements are linked to
(a) gibberel lins (b) enzymes
(c) auxins (d) cytokinins
- The movement of water from one cell of the cortex to the adjacent one in roots is due to
(a) accumulation of inorganic salts in the cells
(b) accumulation of organic compounds in the cells
(c) chemical potential gradient
(d) water potential gradient
- Spermatogenesis occurs in the
- vas deferens.
- interstitial cells.
- seminal vesicles.
- seminiferous tubules.
- What is a function of bicarbonate ions in semen?
- to fertilize the ovum
- to nourish sperm cells
- to increase the pH of the vagina
- to cause contraction of the uterus
- What effect does the hormone that causes development of the corpus luteum in females
have in males?
- sperm production
- testosterone production
- release of luteinizing hormone (LH)
- Which of the following results from the secretion of gonadotropin-releasing hormone (GnRH)
during days 1 to 13 of the menstrual cycle?
- secretion of estrogen by the follicle
- secretion of progesterone by the corpus luteum
- production of human chorionic gonadotropin (HCG)
- Which of the following is a monomer of polysaccharides?
- Which of the following is not a function of a protein?
- storing genetic information
- catalyzing cellular reactions
- sending chemical messages
- transporting glucose into a cell
- Which of the following occurs during complementary base pairing?
- Bonds form between uracil and thymine.
- Bonds form between cytosine and guanine.
- Bonds break between phosphates and sugars.
- Bonds break between amino acids and phosphates.
- The sequence of bases in one strand of a DNA molecule is C C G T A C. Which of the
following represents the sequence of bases that attach to this strand during replication?
- G G C A T G
- G G C U T G
- C C G T AC
- G G C A U G
- One structural difference between DNA and tRNA is that
- DNA has uracil and tRNA does not.
- tRNA contains more bases than DNA.
- DNA contains deoxyribose and tRNA does not.
- tRNA contains more hydrogen bonds than DNA.
- When cells are in a hypertonic solution, the concentration of solute in the cells is
- the same as that of the solution.
- higher than that of the solution.
- lower than that of the solution.
- Which of the following is a monomer of the mosaic component of the cell membrane?
- amino acid
- A vesicle merges with the cell membrane during the process of
- facilitated transport.
- Which of the following describes the function of an enzyme?
- It speeds up a chemical reaction.
- It increases the available substrate.
- It increases the activation energy of a reaction.
- It contributes atoms to facilitate a chemical reaction.
- The chemical digestion of starch begins in the
- salivary glands.
- In which structure does peristalsis not occur?
- the liver
- the stomach
- the esophagus
- the duodenum
Hints and explainations:
3 Systolic means contraction
12 . The strands are held together by H bonds
27 . the sympathetic nervous system stimulates activity
29 Parthenocarpy (literally meaning virgin fruit) is the natural or artificially induced production of fruit without fertilization of ovules. The fruit is therefore seedless.
31 A sheath-like structure found in a plant seed that connects the coleoptile to the primary root and acts as a protective covering enclosing the plumule and radicle.