Four of the five choices listed below are bound by
membranes. Select the exception.
a. mitochondrion
b. ribosome
c. chromoplast
d. vacuole
e. lysosome
Answer: b
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Ribosomes ________.
A. translate mRNA into proteins B. are involved in making ATP for eukaryotic cells C. transcribe DNA into mRNA D. are located inside the nucleus in eukaryotic cells
Predict the expected consequence(s) of applying a toxin that blocks voltage-gated Ca2+ channels in a neuron.
A. No resting membrane potential would be observed (i.e., measures at 0 mV). B. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses. C. The neuron would become hyperpolarized. D. A rapid increase in membrane potential at threshold voltage would not occur. E. Membrane potential would increase rapidly to peak with an action potential, but would not decrease immediately afterward.
Name the individual who, while working with the garden pea in the mid-1850s, demonstrated quantitative patterns of heredity and developed a theory involving the behavior of hereditary factors
A) Barbara McClintock B) Walter Sutton C) George Wallace D) Theodor Boveri E) Gregor Mendel
Consider the mechanism by which actin and tubulin polymerize. Which of the items below does not describe something similar about the polymerization mechanisms of actin and microtubules?
(a) Although both filaments can grow from both ends, the growth rate is faster at the plus ends. (b) Depolymerization initiates at the plus ends of filaments. (c) Nucleotide hydrolysis promotes depolymerization of filaments. (d) Free subunits (actin and tubulin) carry nucleoside triphosphates.