Why would letting a field be taken over by weedy, non-crop members of the bean family be potentially beneficial for farmers? (Select all correct answer options.)
A. Members of this family form symbioses
with N2-fixing bacteria.
B. Members of this family form symbioses
with mycorrhizae.
C. Weedy beans are very efficient
photosynthesizers.
D. It could reduce the need for commercial
fertilizers in subsequent seasons.
A,D
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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. A rapid increase in membrane potential at threshold voltage would not occur. C. Membrane potential would increase rapidly to peak with an action potential, but would not decrease immediately afterwards. D. The neuron would become hyperpolarized. E. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
How does the amount of yolk relate to the nourishment of the organism?
a. An egg with a small amount of yolk contains all of the nutrients for the embryo's development. b. An egg with a large amount of yolk contains all of the nutrients for the embryo's development. c. An egg lacking yolk contains all of the nutrients for the embryo's development. d. There is no relationship between the amount of yolk and the nourishment of the organism. e. All animals have the same amount of yolk and provide the same amount of nourishment.
Scientists first focused on gene regulation at the level of translation, rather than transcription, because more was known about protein than nucleic acids at the time.
Answer the following statement true (T) or false (F)
Hair color and eye color are examples of a person's
A.) recessive traits. B.) dominant alleles. C.) genotype. D.) phenotype.