Fungi are made of bundles of threadlike ________.
A. chitins
B. mycelia
C. lichens
D. hyphae
Answer: D
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Gene expression involves two phases, ___________ and translation.
A. replication B. transcription C. initiation D. condensation
Answer the following statements true (T) or false (F)
1. A person with blood type O can donate blood to people of any blood type. 2. Pea plants cannot self-fertilize because an individual plant is either female or male, having either ovaries or stamens but not both. 3. Pedigree analysis is important for studying human traits because of the relatively small size of human families. 4. A mutation in a single gene always has only one discrete effect on an individual's phenotype.
The restriction enzymes of bacteria protect the bacteria from successful attack by bacteriophages, whose genomes can be degraded by the restriction enzymes
The bacterial genomes are not vulnerable to these restriction enzymes because bacterial DNA is methylated. This situation selects for bacteriophages whose genomes are also methylated. As new strains of resistant bacteriophages become more prevalent, this in turn selects for bacteria whose genomes are not methylated and whose restriction enzymes instead degrade methylated DNA. The outcome of the conflict between bacteria and bacteriophage at any point in time results from _____. A) frequency-dependent selection B) evolutionary imbalance C) heterozygote advantage D) neutral variation
Which statement is TRUE?
A. Myelin is a glycoprotein matrix, secreted by myelinating cells to speed nerve conduction. B. Oligodendrocytes myelinate PNS axons. C. Oligodendrocytes produce scar tissue upon corresponding axonal damage, preventing regrowth of the axon. D. Schwann cells myelinate CNS axons. E. Wallerian degeneration describes the CNS axon breakdown that may still enable regrowth and restoration of function.