Practice Test 1 Flashcards
In the process of exocytosis, the plasma membrane and the membrane of which organelle come together?
secretory vesicle
In comparison to the passage of polar solvents through a cell membrane, the passage of non polar solvents through a cell membrane occurs much more rapidly. This is indicative of
a significant proportion of lipid in the composition of the membrane
When energy is expended to move molecules up a concentration gradient, the process is termed
passive transport
Which of the following organelles is NOT encapsulated within a membrane? a. nucleus b. mitochondrion c. Golgi apparatus d. peroxisome e. centriole
e. centriole
The addition of an enzyme to a solution yields glucose. The enzyme may have acted on which of the following components of the original solution to produce the glucose? a. lipids b. RNA c. DNA d. glycogen e. albumin
c. DNA
NAD and FAD are important to biochemical pathways because of their role as
oxidation-reduction coenzymes
Organisms that use respiration in conjunction with glycolysis are _______ organisms that use anaerobic means of obtaining energy from the degradation of food.
twice as efficient as
The accessory pigments involved in photosynthesis, chlorophyll b, xanthophylls, anthocyanins, and carotenoids, have importance because they
absorb different wavelengths and pass them on to chlorophyll a
Which of the following invertebrates share the most similarities with primitive vertebrates? a. Arthropoda b. Annelida c. Cnidaria d. Nematoda e. Echinodermata
e. Echinodermata
Of the following, which is (are) considered to be a true cell (true cells)? I. Erythrocytes II. Leukocytes III. Platelets
I. Erythrocytes
When referring to the propagation of an impulse within the heart, the ___ is referred to as the “pacemaker” because it has the ___ rate of spontaneous depolarization.
sinoatrial node; fastest
A coma may result from an excessive amount of insulin. This excess is due to
a depletion of blood sugar
Which of the following are globular proteins? I. Antibodies II. Actin and myosin III. Collagen IV. Hemoglobin
I. Antibodies and III. Collagen
Tropomyosin
blocks the binding sites on actin, preventing myosin cross-bridge attachment at low Ca2+ levels
A cell undergoing mitosis that has lost its nuclear membrane but in which chromosomes are aligned before separation and migration to opposite poles is in which stage?
metaphase
In contrast to electrical synapses, chemical synapses are
the site of unidirectional communication between neurons.