Answer the following statements true (T) or false (F)
1. All enzymes are proteins.
2. Because of the abundance of ribosomes, translation is NOT an energy costly process for the cell.
3. The cells of every organism make only a few different tRNA molecules encoded by the same gene.
4. In eukaryotes, 40S and 60S combine to form a 100S ribosome.
1. FALSE
2. FALSE
3. FALSE
4. FALSE
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In an egg cell treated with a chemical that binds calcium and magnesium ions, the _____
A) acrosomal reaction would be blocked B) fusion of sperm and egg nuclei would be blocked C) fast block to polyspermy would not occur D) fertilization envelope would not be formed E) zygote would not contain maternal and paternal chromosomes
The process whereby repeated, short stimuli provided to a hippocampal neuron have the effect of strengthening the synapse it makes with other neurons is specifically referred to as
A. long-term potentiation. B. short-term potentiation. C. neurotransmission. D. synaptic reuptake. E. None of these choices are correct.
Homosexuality
A) is seen only in humans. B) reflects the input of a number of genes and environmental factors. C) is inherited from a mutation on the X chromosome. D) is only the result of environmental influences.
What is the collective name for the epicotyl, shoot apical meristem, and young leaves?
a. coleptile b. radicle c. plumule d. hypocotyl