Which of the following is the primary function of saprobic protists?
a. returning inorganic nutrients to the soil and water
b. using carbon fixation to generate nutrition for organisms
c. providing a protective environment for zooxanthellae
d. facilitating reproduction by recombining genes
a. returning inorganic nutrients to the soil and water
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An individual with nonidentical alleles for a gene is called ________ for that gene
a. recessive b. heterozygous c. hemizygous d. homozygous
The F2 generation (the larvae measured in comparison) is shown in the graphs at the bottom of this figure. The cluster of bollworms at lower larva weights would have which genotype?
A. Rr B. Rr or rr C. rr D. RR E. Rr or RR
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.
Darker bodies located in the nucleus of some cells are called
A. mitochondria. B. Golgi bodies. C. nucleoli. D. nucleus.