A population with small changes in allele frequencies is called
A. natural selection.
B. adaptation.
C. microevolution.
D. convergent evolution.
E. fitness.
C. microevolution.
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The outcome of the joining of cytology and biochemistry yielded a better understanding of the cell by
A) identification of cellular structures. B) identification of cellular biochemical pathways. C) creating bioinformatics. D) identification of cellular structures and biochemical pathways. E) identification of biochemical pathways and creating bioinformatics.
There have been experiments performed that simulate early Earth conditions. These experiments most
likely demonstrated that a. DNA forms readily and reproduces itself. b. many of the lipids, carbohydrates, proteins, and nucleotides required for life can form under abiotic conditions. c. complete, functioning prokaryotic cells are formed after approximately three months. d. a lipid-protein film will eventually be formed by thermal convection. e. oxygen was present in large amounts.
Small DNA tumor viruses such as SV40 and HPV have viral oncogenes that are not homologs of host cell genes. Some of these novel viral oncogenes make proteins that exert their tumorigenic effect by
A) binding to and inactivating pRB. B) making Gag, Pol and Env proteins more active. C) causing cellular proto-oncogenes to mutate into oncogenes. D) causing apoptosis in target tissues. E) inactivating the immune system.
What do Echinococcus granulosus, Entamoeba histolytica, and Enterobius vermicularis have in common?
A) They are transmitted by insect vectors. B) They live in the intestines of their definitive host. C) They are intracellular parasites. D) They cause zoonoses in humans. E) They are diagnosed by examination of a blood smear.