As blood is pumped through the chambers of the heart it directly supplies the heart with oxygen and nutrients.
Indicate whether the statement is true or false.
Answer: False
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Luke sprained his ankle, tearing some of the collagen protein that forms his ligaments. Some types of collagen consist of three polypeptide chains twisted together to form a rope-like strand. What level of protein structure does this rope-like strand represent?
A. Primary B. Secondary C. Tertiary D. Quaternary
Today, the fossil record
A. can be dated only with one layer in relation to older layers below and younger layers above, no actual dates can be estimated. B. can be dated reasonably well only with uranium-238. C. can be dated reasonably well using a variety of radioactive isotopes with known half-lives. D. can be dated precisely, to within a single year, using radioactive isotopes. E. can be dated precisely, to within a single year, using DNA hybridization.
One day after a biology class four of your friends argue about the difference between phylogeny and systematics. Which friend is right?
A. Friend A states that systematics and phylogenies are really the same, one is more recent than the other, but basically they are the same. B. Friend B says that systematics is the same as cladistics and cladistics is reconstructing clades, which ultimately lead to the development of phylogenies. C. Friend C argues that systematics is the actual collecting and cataloguing of specimens into museums that can be used later by scientists to construct clades and phylogenies. D. Friend D says that the way she remembers is that systematics is the reconstruction and study of phylogenies.
By volume, what percentage of cells in blood are white blood cells?
a. 15 percent b. 50 percent c. 1 percent d. 85 percent