Which is NOT a human disease using an insect as the vector?
a. Malaria
b. Plague
c. Chagas' disease
d. Yellow fever
e. AIDS
Answer: c. Chagas' disease
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One regulatory step in the process of gene expression and synthesis of proteins is the actual modification of proteins themselves, called ____ modification
Fill in the blank with the appropriate word.
The two strands of DNA in a DNA double helix
a. are identical to each other. b. are connected to each other by covalent chemical bonds. c. both contain nucleotides, but the order of the nucleotides on the two strands is not related. d. are oriented in the same direction. e. are antiparallel to each other.
Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. Which of the following hypotheses is most plausible in light of such structural similarities?
A) Cilia and flagella arise from centrioles. B) Loss of basal bodies should prevent cells from dividing in two. C) Motor proteins such as dynein must have evolved before any of these four kinds of structure. D) Cilia and flagella evolved separately in the same ancestral eukaryotic organism. E) Natural selection for cell motility repeatedly selected for microtubular arrays in circular patterns in the evolution of each of these structures.
Which of the following is a property of all living organisms?
a. Reproduce using RNA. b. Use the sun to fuel metabolic processes. c. Grow and develop based on inherited RNA. d. Respond to stimuli in the external environment.