Which of the following statements is TRUE?
A) Carbon, hydrogen, oxygen, and calcium are the most abundant elements of living matter.
B) Some naturally occurring elements are toxic to organisms.
C) All life requires the same essential elements.
D) A patient suffering from a goiter should not consume seafood.
Ans: B) Some naturally occurring elements are toxic to organisms.
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Many of the signaling pathways used for communication between cells in complex multicellular organisms first evolved in:
A. unicellular eukaryotes. B. simple multicellular eukaryotes. C. unicellular prokaryotes. D. simple multicellular prokaryotes. E. complex multicellular prokaryotes.
Answer the following statements true (T) or false (F)
1. Red algae, green algae, and plants are so closely related that they are grouped in the same supergroup by most biologists. 2. Animals and fungi are more closely related to each other than either is to plants. 3. Fungus-like protists are more related to true fungi in the supergroup Opisthokonta than they are to members of any other supergroup. 4. Protists are organisms that are generally microscopic, live in moist environments, and cannot be classified in the animal, plant, or fungal kingdoms.
Which of the following BEST describes an epitope?
a. the antigen binding site of an antibody molecule b. found only in IgG and IgM c. part of an antigen that stimulates production of, and binds to, a specific antibody d. too small to stimulate an immune response e. a complement protein that initiates lysis of target cells
Geologists have evidence that over the past 1.5 billion years
A) Earth's landmasses have remained in the same shape and positions as they have in the current time. B) Earth's landmasses have joined into a single continent and split back apart again on three occasions. C) Earth's landmasses have changed positions extensively but have remained separate and in the same shapes. D) Earth's landmasses have changed shape and have been entirely submerged in water on three occasions.