As a general, common feature, what characteristic do flatworms (Platyhelminthes) have in common with some of the more advanced animal phyla?
A) a shell
B) complex sensory organs
C) bilateral symmetry
D) a coelom
E) segmentation
Answer: C
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In a lichen, the fungal partner
A. provides a substratum within which the alga grows. B. provides water and minerals to the alga. C. protects the alga from excess light intensities. D. All of the choices are correct.
Answer the following statements true (T) or false (F)
1. More conservation spending has led to greater recovery of black rhinoceros numbers. 2. The United States contains at least one biodiversity hot spot. 3. The passenger pigeon went extinct due to an introduced parasite. 4. The number of extinctions of birds and mammals has gone up as human populations have increased. 5. The introduction of avian malaria to Hawaii was responsible for the extinction of almost half of Hawaii's native birds.
If a eukaryote cell contains a non-functional mutated form of RNA polymerase II, what result is most likely?
a. The cell will be unable to assemble ribosomes. b. The cell will synthesize non-functional tRNAs. c. The cell will be unable to transcribe most genes. d. The cell will only be impacted during mitosis.
The immunoglobulin class that is the only one capable of crossing the placenta is
A. IgA. B. IgE. C. IgM. D. IgG. E. IgD.