Which of the following sequences of DNA would most likely be damaged by UV radiation?
A. AGTTCGCTT
B. ATAGAGCGC
C. AGAGCGCAT
D. AGTACGCAT
Answer: A
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The activation of helper T cells is likely _____
A) when an antigen is displayed by a dendritic cell B) when a cytotoxic T cell releases cytokines C) when natural killer cells come in contact with a tumor cell D) in the bone marrow during the self-tolerance test E) when B cells respond to T-independent antigens
According to the fossil record, the oldest vascular plants are placed in which phylum?
a. Rhyniophyta b. Bryophyta c. Anthocerophyta d. Pteridophyta e. Lycopodiphyta
Which biological events took place during the Paleozoic Era and the Mesozoic Era?
A. During the Paleozoic Era, three mass extinctions occurred which led to the colonization of land by plants, while during the Mesozoic Era, gymnosperms became the dominant plant life. B. During the Mesozoic Era, five mass extinctions occurred which led to the colonization of land by plants, while during the Paleozoic Era, angiosperms became the dominant plant life. C. During the Paleozoic Era, five mass extinctions occurred which led to the colonization of land by plants, while during the Mesozoic Era, angiosperms became the dominant plant life. D. During the Mesozoic Era, three mass extinctions occurred which led to the colonization of land by plants, while during the Paleozoic Era, gymnosperms became the dominant plant life.
The data below suggest that the proportion of sexuals in snails increases with parasite load. Is this the only possible explanation for the observed differences in the degree of sexual reproduction?
a. Yes, the data points show a clear correlation between parasite load and sexual reproduction. b. Yes, factors other than parasites are unlikely to fine-tune the degree of sexual reproduction in natural populations. c. No, lakes and streams differ in their average parasite load. d. No, habitat differences between lakes and streams may be responsible for different levels of sexual reproduction.